DE2161848A1 - Process for simultaneous cleaning by means of blasting treatment and for applying a metal to protect against corrosion on metal surfaces and for carrying out the process suitable abrasive composition - Google Patents

Description

J. C. Hompel's Skibsfarve-Fabrik A / S, Lyngby / Denmark

¹¹ Process for simultaneous cleaning by means of blasting treatment and for applying a metal that protects against corrosion on metal surfaces. As well as abrasive composition suitable for carrying out the process "

Priority 14 December 1970, Great Britain, Note no .: 59 328/70 (Provisional Specification)

The present invention relates to an improved method for simultaneous cleaning by means of blasting treatment and for Application of a metal to protect against corrosion on metal surfaces using a mixture of abrasives and protective metal.

A two-step process is already known for steel surfaces to be provided with a rust-proof zinc coating. In the first stage, the steel axes are grounded by the usual sandblasting treatment descaled and in the second process stage

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Zinc powder is thrown against the cleaned steel surfaces by means of a further jet treatment

According to the procedure described in GB-PS 1 041 620 it is also possible to simultaneously clean steel surfaces and to coat them with a corrosion-resistant metal by Abrasive particles thrown against the surfaces concerned, which are coated with a protective metal such as zinc. k In this known method, the coating of the abrasive particles with the zinc is carried out by the fact that the abrasive and zinc powder mixed well together.

It has now been found that a method of the above characterized type can be significantly improved by the fact that the protective metal by means of a binding agent with the Schleif ™ . Adhesively connects medium grains. In this way, the achieve the following main technical advantages:

^ a) The abrasive grains can contain higher concentrations of the Pick up protective metal;

b) other protective metals besides zinc can also be used and the abrasive granules can contain other additives as well as mixtures of additives and Pick up protective metal;

c) the protective metal can be distributed in various ways on the abrasive grains, so that for the highest efficiency can be submitted for a given purpose. For example, the protective metal on the outer

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reu surface of the * binder enriched leg, or it

can be in the binder layer itself, or one

can have a structure or structure consisting of several layers use a structure in the manner of a "sandwich".

d) The abrasive can be made faster, and you achieves a more uniform composition.

e) As a result of the better adhesion of the protective metal to the abrasive grains the risk of dust formation and the amount of dust during the blasting treatment are reduced.

f) The amount of protective metal absorbed by the abrasive "can be easily adjusted for any desired purpose by means of the amount and / or the type of binder.

g) Better corrosion protection is achieved with the same amount of protective metal.

h) Even with long-term blasting treatment, the protective effect reduced to a lesser extent.

i) For the subsequent application of a paint ■ Better preconditions are created, i.e. the blasted metal surface shows better suitability as a paint base. ·

The method according to the invention for simultaneous cleaning by means of blasting treatment and for applying an anti-corrosion protection protective metal on metal surfaces using a mixture of abrasive and protective metal is therefore

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according to the fact that an abrasive is used, in which the protective metal is bonded to the abrasive grains by means of a binding agent.

In the method according to the invention, the Binder and abrasive grains comprising an abrasive metal blasted or thrown against the metal surfaces concerned. In the context of the invention, the terms "Blasting treatment" or "spinning" in the broadest sense. understood, ursd it includes any treatment by means of which ' the abrasive grains against the metal surfaces to be protected thrown from / to earth. Any suitable device or any suitable measure can be used for this, for example a spinner system or other mechanical device which is used to spin the abrasive granules against the metal surfaces to be treated, and air jets or gas jets and / or fluid flows are also used for this purpose into consideration. In the context of the process according to the invention, the so-called method is of particular importance Wet blasting, for example wet sand blasting, where a water spray jet is used to prevent the disintegration Remove the dust generated by the abrasive grains ο Without the according to the invention at the same time during such a blasting treatment This method of wet blasting is of little interest in practice because the corrosion protection effect achieved is during The moist atmosphere resulting from the blasting treatment also increases the susceptibility of the treated metal surfaces to corrosion.,

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BATH ORIGINAL

In the method according to the invention, abrasive grains of the usual type or abrasives composed in a special way can be used. Examples of typical abrasives are as follows: metallic abrasives such as wire cuttings, cast iron shot and gravel, and steel shot and gravel; also oxidic abrasives of a synthetic or naturally occurring type, such as aluminum oxide and zirconium oxide; Silica-containing abrasives, for example sand, shot and powdered glass, and flint; Conglomerates or slags, such as mineral slag or copper slag. The abrasive grains can have surfaces of any shape, for example smooth, angular, porous or grooved surfaces. The selection of a suitable abrasive for a particular purpose depends on a variety of considerations, such as easy accessibility of the abrasive. on its cost, its color and, in particular, its abrasive effect, which depends, among other things, on the hardness or toughness of the material in question, its size, shape, chemical composition and specific weight

In the present invention the metal surfaces to be treated han delt it is essentially surfaces of design or construction elements made of iron or steel, such as steel plates, as well as welds and castings of cast iron. Of course, the method according to the invention also offers advantages when used on surfaces of other metal objects that have to be protected against corrosion.

Since in the process according to the invention in general the

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The layer of the protective metal generated on the metal surface to be protected is not continuous, a protective metal is preferably used which also has an anti-corrosion effect over a certain distance, such as zinc, aluminum, cadmium, magnesium or lead. Of course, other metals or metal alloys can also be used, for example tin or manganese. Alloys of tin and zinc, of copper and zinc and the well-known Wood's metal, which h . consists of 25 parts of lead, 12.5 parts of cadmium, 50 parts of bismuth and 12.5 parts of tin.

With regard to its value for money, the good protective effect and the low risk of damage to health is particularly preferred in the context of the invention as a protective metal, and therefore the invention is further illustrated below using this preferred metal

The amount of the binder to be used in combination with the W abrasive grains and the protective metal is usually 1 percent by weight or less based on the total weight of the abrasive. In some cases, good results are achieved with a binder content of 0.1 percent by weight, and the maximum amount of binder

The fact that the mean usually results from the / that then the abrasive particles begin to stick together »Within the scope of the invention, a large number of different binders can be used and the only condition that must be observed

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"is that the. binder on the abrasive granules must adhere and also have an adhesive effect in relation to the protective metal, so that the latter in stronger Ausrnass is bound to the abrasive grains ^ as if no binder is also used. In addition, the binder should be practically non-evaporable, and it should be corrosion-reducing or corrosion-preventing effects of the protective metal Significantly affect - it is also responsible for a good binding agent effect In the context of the invention it is desirable that this has good wetting properties and good penetration properties with regard to the abrasive grains, is stable even at higher temperatures, has low toxicity, even if it is applied at higher temperatures, and against the harmful influence of water and alkaline Substances shows sufficient resistance. In addition, it has proven beneficial if that The binder in question is not too brittle

It has already been pointed out above that the binders can be selected from a large number of different types o For example, binders that dry under the influence of oxygen, such as alkyd resins, paints ; drying oils, stand oil, phenolic resins, alkyd resins modified with styrene and epoxy ester resins. In addition, physically drying binders can be used, such as chlorinated rubber (with or without the addition of plasticizers), phenoxy resins, cyclo rubber, epoxy resins, polyamide resins, acrylic resins, isobutylene resins and adduct resins made from amines and epoxy compounds. You can also

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ORIGINAL INSPECTED

In the context of the invention, reactively drying binders are used, such as epoxy resins hardened by means of polyamides, epoxy resins hardened by means of amines, sodium silicate and ethyl silicate. Also non-drying binders such as plasticizers, tar, bitumen, surface-active compounds like silicone oils and lecithin, furthermore wax, as well as vegetable oils and mineral oils as raw products or ο as refined products come into consideration.

In general, soft binders are within the scope of the invention, more suitable than hard binders, and with regard to the chemical structure it can be pointed out that a large number the highly suitable binder contains an epoxy group in the molecule. The compound is of particular interest as a binder Dibutyl phthalate.

Particularly surprising is the fact that when using the method according to the invention when using. the. same amount on protective metal, such as zinc, a significant improvement in the corrosion protection effect is achieved compared to known measures in which abrasives without a binder are used »To check whether this special effect is based on the fact that the particles of the protective metal B, for example the zinc particles, by means of a Binder to which the abrasive grains are bound, a test was carried out with a treated steel surface and then the steel surface was washed off with a hot solvent to remove any residues of the binder to remove. However, this measure had no influence on

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the corrosion protection effect, and from this it must be concluded that the adhesion of the zinc to the steel surface on a is based on a direct metal-to-metal bond and did not come about under the influence of the binder used.

The use of a binder opens up completely new possibilities compared to the known processes. For example, the amount of protective metal can be increased to practically any desired and desired value, and the protective metal can also be distributed on the abrasive grains in a special way »

For example, it has been shown that the corrosion protection effect increases with the amount of protective metal applied. Pure zinc as a protective metal, this increase runs up to one Share of 30 to 40 percent by weight on sand as an abrasive practically proportional «If you combine larger amounts of zinc .tion Used with abrasives of high specific weight, the anti-corrosion effect can then be achieved with the Extend the procedure for steel surfaces up to several months even under atmospheric weather conditions. Of particular importance, however, is the fact that even very small amounts of zinc when using the invention Process allow a surprisingly good anti-corrosion effect. ''

Furthermore, it has been shown that with zinc amounts of more than. 3 weight percent better results when using very fine zinc dust compared to zinc flakes and coarser zinc

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- ίο -

powder can be achieved «At lower zinc concentrations, however, there is no significant amount of zinc in terms of the form in which the zinc is used Difference noted more.

An embodiment of particular interest in the inventive The method consists in that it is possible to use a mixture of the protective metal and an additive in finely divided form State to combine with the abrasive particles, this additive reducing the suitability of the metal surface in question promotes as a paint carrier. These are components that ensure the adhesion between the treated metal surface and the primer coat or another coloring drive, increase that applied following the blasting treatment will ο an example of such, the suitability of the The component promoting the metal surface as a paint carrier is zinc oxide. In contrast to the behavior that you would actually expect It has been shown that mixtures of 50 percent zinc and 50 percent zinc oxide not only improve the paintability of the Treated metal surfaces improve, but also show an excellent anti-corrosion effect. With the usual Process for applying zinc-containing primer paints to cleaned steel surfaces has been accepted so far, that the zinc particles must be present in the paint in such a concentration that they will be present after application to be in contact with each other. Like the good anti-corrosive effect confirmed by mixtures of zinc and zinc oxide, it is not necessary, however, in the process according to the invention, that such direct contact between the zinc

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■ Particle, consists «Improving the suitability of metal surfaces as a paint base when using iron mixtures Zinc oxide and zinc: in the process according to the invention is special practical interest «It must, however, in the given context it should be pointed out that metal surfaces treated according to the invention are also good for a subsequent one Paint is suitable if such an additional component is not used, as the blasting treatment already causes the Metal surfaces are given the required roughness. If, on the other hand, you apply the usual zinc-based primer coats to a blasted steel surface is applied, this causes a smoothing of the surface «

The invention also relates to abrasive compositions which can be used to carry out the foregoing Process suitable, and which are characterized in that they consist at least partially of abrasive grains on which a protective metal is adhesively bonded by means of a binding agent.

Such soap compositions can be used in a wide variety of ways In this way, too, the use of a binder offers considerable benefits Advantages.

A process for the preparation of the soft soap compositions according to the invention consists in applying a mixture of the protective metal and binding agent to the abrasive grains, this mixture usually in the form of a

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Dispersion of the finely divided metal in the liquid binder is present. The "binder" can in itself be a liquid, or it can be produced by heating, for example if it is a thermoplastic material, or by dissolving it in a suitable solvent, in the liquid one State to be transferred. Many commercially available binders are already in the form of such solutions. The mixture the dispersion of the protective metal in the binder and the abrasive grains is then, for example, in a drum ' | l - kept in motion while rotating or otherwise well mixed, for example by shaking or vibrating until the dispersion is evenly on the surface of the abrasive grains has distributed. If a solution of the binder is used, the solvent can also be used while rotating or Bonstigen stirring the mixture from this can be vaporized by, for example, hot air through the mixture directs.

Another possibility for producing the abrasive compositions according to the invention consists in first applying the binder and only then the protective metal to the abrasive grains. In this embodiment, firstly, the binder distributed evenly on the grain surface, and then brings the protective metal on _t, for example in the form of a finely divided powder, which then accumulates on the outer surface of the binder coating. This enrichment of the protective metal on the outer surface of the binder coating can be particularly promoted,

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that the binder is allowed to take on a higher viscosity before the metal is added. For example, if it is a thermoplastic material is involved, the binder can be applied to the abrasive grains at an elevated temperature, and then allowed to cool to room temperature, for example, prior to the addition of the protective metal particles. Through this an abrasive composition is obtained in which the protective metal is significantly deposited on the outer surface of the Binder coating is enriched.

Such abrasive compositions at a high concentration of the protective metal on the outer surface of the binder are of particular interest because they are used high corrosion protection effects can be achieved. In particular, there are advantages in this embodiment if the relevant Abrasive is used only once, as is the case with sand and copper slag of the pail. Therefore it is when using such Abrasives preferable that the protective metal in the specified manner on the outer surface of the binder coating is enriched.

There is another embodiment of practical interest in only enriching the protective metal on one side of each grain of abrasive ο if, for example, sand is used as an abrasive and zinc are used as a protective metal, then the individual sand particles tend to have the zinc only on one side is enriched due to the difference in specific gravity between zinc (higher specific gravity) and sand (lower specific weight) to ensure that the sand

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particles immediately before they hit the one to be treated Align the surface so that the zinc-enriched side faces the metal surface »This way there is a high probability that a large proportion of the zinc present on the sand particles will also enter the treated Surface penetrates and accordingly less zinc is required to achieve the desired anti-corrosion effect as if the same amount of zinc was evenly spread over the surface the abrasive grain is distributed.

Abrasive compositions according to the invention, in which the protective metal is only enriched on one side of each abrasive particle can be made in a variety of ways will. One embodiment is that you get a mixture of the protective metal and the binder is sprayed onto a bed of the abrasive particles which is relative to the In the case of this bed, for example be a thin layer of abrasive particles on a conveyor belt or conveyor belt, or this made of abrasive grains existing bed can be formed by a curtain of falling particles. The mixture of protective metal and Binder is then only from one direction on this curtain. sprayed on.

Very good results are also achieved by means of a working method which involves first applying a binder coat to the abrasive particles, then a layer of the Protective metal or from a protective pigment or from a

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the suitability of the metal surface as a paint-promoting component, e.g. made of zinc oxide, graphite or asbestine, then another layer of binder, then another layer of the protective metal or the suitability of the metal surface as a paint carrier promoting component and in this alternation continues, with the. outermost or, respectively, last layer consists of the protective metal in question «Leave it this way the most varied of combinations and additional layers in the form of a structure of multiple layers or in the form of one

Create sandwich structures, which has the advantage that, among other things large amounts of the protective metal or additional components can be applied to the abrasive grains. In the case of such a multiple structure, what has already been said above

'has been pointed out, the outermost layer of the relevant Protective metal exist.

The method according to the invention can be carried out by means of the usual devices or devices for blasting treatment are carried out, with a single-use abrasive being used can be, which so after performing the blow. Treatment is not used again, or a reusable abrasive can be used »Any The type of abrasive can be useful in the method according to the invention Composed entirely of abrasive grains, virtually all using the binder with the protective metal are adhesively connected, or it can be a mixture of such abrasive grains and of abrasive grains without Metal or binder can be used. Surprisingly

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- 1 D -

It has been shown that in most cases there is practically no difference in the corrosion protection effect achieved with a predetermined amount of zinc, regardless of whether this amount of zinc is distributed over all abrasive grains or whether a mixture of untreated abrasive grains and abrasive grains with a high zinc content is used, In the latter case, the amount of zinc is chosen so that the average zinc content of the total mixture is the same as that of the abrasive grains treated as a whole. When performing the blast treatment using a mixture of 50 parts of untreated sand and 50 parts of sand with a zinc content of 30 percent-Bpielsweise, one achieves substantially the same anti-corrosion effect _/ as when used for the blast treatment a sand, the means of a 15 percent zinc binder has been applied. This results in very interesting possibilities for shipping the abrasive compositions according to the invention, since then abrasives with a high concentration of the protective metal

will be sent körinen, which only by the end user in the appropriate Can be diluted with an abrasive that does not contain any binder or protective metal. , '

If the inventive method using Abrasives is carried out that are used more than once, for example using steel sarid, steel shot or steel shot, which is believed to be one of the most useful embodiments of the invention the concentration of the protective metal in the course of the blow treatment

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treatment because of the inevitable loss of the protective metal as a result the adhesion to the surfaces to be treated and the disintegration of the abrasive grains become too low. In this In this case, the required content of the protective metal can be adjusted accordingly by removing what is not yet used Abrasive with a content of protective metal added, the amount of fresh abrasive and the concentration of the Protective metal on the abrasive grains appropriately chosen that the loss of protective metal is continuously compensated and thus constantly the desired corrosion protection effect is achieved. Another way to compensate for the loss of protective metal, especially if the consumption , where the abrasive itself is low, such as in the j pall of steel sand, consists in using fresh binder and ; new protective metal for the "circulated abrasive to add and thus to apply a new layer of protective metal to the abrasive grains.

Another way to maintain the desired Corrosion protection when using a circulating abrasive consists in the protective metal in such Quantities and to be applied in such a way that the amount of protective metal applied to the metal surfaces to be treated remains practically constant throughout the life of the abrasive. For example, you can have several Apply layers of the protective metal to the abrasive grains and / or use high amounts of binder, for example about 1 weight percent or above based on

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the entire abrasive composition. Compared to abrasives with a lower proportion of binder can such

ι *

Abrasives initially show a lower corrosion protection effect, but this remains for practically the entire period of use of the abrasive unchanged.

The abrasives practice in the method according to the invention practically the same descaling effect or cleaning effect as not with regard to the treated metal surfaces particles coated with binder and protective metal. In the method according to the invention, however, comes through the protective metal at the same time as the sole agent particles with those to be treated Metal surfaces in contact and is deposited on the cleaned surface. A disadvantage with the The usual blast cleaning of steel surfaces consists in the fact that the freshly cleaned surface is highly active and immediately reacts with the humidity and other corrosive components of the atmosphere in which the blowing treatment is carried out. Applying a primer coat can prevent the progress of such corrosion but it always has a certain, albeit external appearance invisible, corrosion in the time interval between the blasting treatment and the application of the primer coat took place. In contrast to this, the method according to the invention enables any corrosion phenomena to occur.

to prevent,

gen / because there is practically no measurable time between blasting treatments and the deposition of the protective metal elapses. As a result of the intimate contact between the protective metal and the

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treated surface "is also for a sufficient anti-corrosion effect a smaller amount of the protective metal is required, and this results in lower speed reductions when cutting and welding the metal surfaces as well as a higher quality with regard to the weld seams and a lower formation of toxic fumes during burning, of cutting and welding compared to the application of conventional primer coats «

In addition, the method according to the invention also offers advantages when cleaning old steel structures, especially if they have been exposed to the effects of the marine climate and deep rust pockets show, which are usually dissolvable Contain bisene salts, such as chlorides and sulfates. By means of the

■ according to the method, the harmful effects such salts neutralized. The beneficial effect of the protective metal can in some cases also be enhanced by it that you also apply catalysts or other additives to the abrasive grains, which with the Protective metal work together.

Although when using the inventive method a better corrosion protection is achieved, can be externally calibrated no difference between a metal surface cleaned in a known manner and a surface cleaned according to the invention detect even though corrosion has already taken place on a metal surface that has been cleaned in the usual way can. The reason for this can be seen in the fact that usually

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a certain time elapses before a corrosive attack also appears externally. Because of this, it can be expedient, those used in the process according to the invention To add an indicator to abrasive grains, for example an indicator compound, so that a The outside of the cleaned surface can easily be distinguished from a metal surface cleaned in the usual way lets ο As such an indicator compound, for example ·; wise a pigment with high color strength can be used, which ^ 'ches also firmly adhered to the by means of the binder Abrasive grain is bound.

; The invention is illustrated in more detail by the examples below. In these examples, various devices are used for blasting treatment, viz

Device 1:

a small-sized suction system that works with recirculation (Manufacturer: Clementine USA).

Device 2:

a suction system of larger dimensions (manufacturer'-Guyson Industrial Equipment Ltd., England).

Device 5 t

a centrifugal system (manufacturer, "Vogel & Schemman AG, BRD")

The blasted sheets are tested in accordance with the ASTM standard B 117-64 (salt spray test at 35 ° C) and with regard to rust formation according to ASTM standard D 610-68. The rust rating

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numbers have the following meaning

10 = 0 % $> rust 9 = 0, 03 Io Il 8 = 0, 1 fo Il 6 = 1 It 4 = 10 si Il 2 = 33 It 1 = 50 11 0 = 100 11

The following are used to carry out the exemplary embodiments Substances used:

Methyl isobutyl ketone, abbreviated as MIBKo ethylene glycol monoethyl ether, abbreviated as Ox « Ultra-fine zinc dust (manufacturer; Morris Ashby, England)

Zinc in flake form in the form of a paste with a zinc content of 83 percent (manufacturer; Eckart Werke, Germany)

Wood'schqs Metall (manufacturer; Eckart Werke, Germany) Magnesium (manufacturer; Eckart Werke, Germany)

Sand with a particle size of 0.5 to 1.5 mm (Manufacturer; Oo Poulsen, Denmark)

Epoxy resin A (epoxy equivalent 175 to 210) Epoxy resin B (epoxy equivalent 225 to 290) Epoxy resin C (epoxy equivalent 450 to 525)

Epoxy resin C in the form of a sol (solution of 50 g epoxy resin C in 25 g xylene and 25 g MIBK) ₀

Zinc oxide (manufacturer: Ranaes Bruk, Sweden).

Epoxy ester-50 percent, made by esterifying the epoxy groups and hydroxyl groups of an epoxy resin with fatty acids of drying oils. Fatty acid content: up to 40 percent. Applied in the form of a 50 weight percent Solution in xylene.

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Polymer D (polymer of acrylic acid and methacrylic acid with a viscosity of 1200 to 1900 cP at 125 ° C, applied in the form of a solution in methyl ethyl ketone with a pesticide content of 35 percent)

Chlorinated rubber (chlorinated natural rubber) with a chlorine content of about 76 percent. Viscosity: 20 cP at 25 ° C, applied in the form of a solution in toluene with a pesticide content of 20 percent.

Chlorinated paraffin with a chlorine content of about 50 percent, viscosity: about 20,000 cP at 20 ^° C.

^ High-boiling antracene oil (manufacturer: Superfos, Denmark) Soy lecithin (manufacturer: Dansk Sojakagefabrik, Denmark) Graphite (manufacturer: L.Struve, Germany)

Copper slag with a particle size of 0.5 to 3.5 mm (Manufacturer: Melchemie, Netherlands)

Corundum (manufacturer: Dynamit Nobel AG, Germany)

Wire sections with a length of 0.6 mm

Steel gravel (manufacturer: Panner Continental, Netherlands) "

Ethyl silicate (mixture of ethyl polysilicates with an average of 5 silicon atoms per molecule, SiO ₂ content about 40 percent).

example 1

The type and shape of the protective metal and the composition of the abrasives are shown in Table I. The abrasives are made in the following way: Sand with a particle size of 0.5 to 1.5 mm is mixed with the

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preheated to 6O ⁰ C A epoxy resin mixed and allowed to rotate for as long are completely wetted until all sand particles. The metal powder is then added and the rotation is continued until it is completely free of dust (about 2 to 5 minutes). The flake zinc, magnesium and Wood's metal are mixed with the sol of the epoxy resin c and the solvents before being added to the sand and homogenized by rotating.

The pre-treated abrasive is used for testing the abrasives in question Blow sand onto steel plates covered with a very thin primer coat. This primer coat consists of a polyvinyl butyral phenolic resin and has a strength of only about 5 to 10 / U, so that the irradiated area can be determined visually.

The blasted panels are then subjected to the salt spray test (ASTM Standard B 117-4) and it becomes that period measured until reaching a rust rating number of 8 or 6 elapses.

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Table I.

Type and form of the protective metal in the abrasive compositions

Premix

Epoxy resin C-Sol

MIBK
! Ox

Xylene

Zinc dust

Zinc in flake form. Wood's metal magnesium

Added to sand

28

200

200

11

18 2

27 2

54 9

73 200

1000

1000

1000

Rust rating number 8

Rust rating number 6 Hrs. 4 hrs. 5 hrs. 4 hrs.

Hours 5 hours 6 hours 6 hours »

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Table II

With changing amounts of metal or using the paint bar

promotional additives Abrasive compositions

sand
Epoxy resin A

Zinc dust
Zinc oxide]

mixed.

1000

1000 1 000 1000 1 000 5 5 5 8th 20th 120 200 25th

Eost rating number 8 Rust rating number 6 ,

0.1 hours 6 hours 24 hours 86 hours 4 hours 0.2 hours 7 hours 27 hours .88 hours, 5 hours

Example 2

The composition of the abrasives used is shown in Table III below.

For the production, the relevant high molecular weight binders, namely the epoxy ester, the polymer D or the Chlorinated rubber, first dissolved in the specified solvents, then the zinc dust is dispersed in it and finally the sand is added and mixed by rotating ο

The other binders, namely epoxy resin A, dibutyl phthalate,

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Antracene oil and soy lecithin are added directly to the sand and after they are well dispersed on the particle surface, the zinc dust is added and mixed in

Rotate until there is no dust, i.e. about 2 to 5 minutes, (see Table IV).

The irradiated steel panels are tested in the same way as in Example 1 o

Table III

Type and shape of the protective metal in the abrasive compositions

Epoxy ester - 50 percent including desiccant

Xylene

Polymer D

MIBK

Chlorinated rubber, chlorinated paraffin, zinc dust

added to
sand

16 - 32 10 9 - - 9 8th 13th - - 10 - - 200 30th 100

1000

1000

1000

Rust rating number 8 Rust rating number 6

4 hours

5 hours

4 hours
6 hours

6 hours 8 hours

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Table IV

Type and form of the protective metal in the abrasive compositions

g gg g g g

Sand 1000 1000 1000 1000 1000 1000 1000

Epoxy resin A 0 1 2 4 _

Dibutyl phthalate. - - - 6

Antracene oil - -. "- - - - 6 -

Soy lecithin - - - - - - 6

Zinc dust 50 50 50 50 50 50 50

5 ^0St "" ₊ 0.8 3 7 10 15 12 H

NS? ^r Q ^gs ~ hrs. hrs. hrs. hrs. «hrs. hrs. zaji ο

Rust 1.4 4 9 11 17 13 16

Rating hrs. Hrs. Hrs. Hrs. Hrs. number 6

Example 3

The composition of the abrasives used and the type their preparation can be seen from Tables V and VI.

Purely the production type A (with solvent) is the relevant The binder is first dissolved in the solvent and then the zinc dust is dispersed in the solution. This mixture

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is added to the sand and then mixed while rotating, hot air being passed through the mixing container to remove the solvents.

Procedure B (without solvent): The binder is used as a liquid or liquefied, such as by Heating with epoxy resin A. It is then distributed on the sand particles while rotating. Then the zinc dust is set added and continues to mix while rotating to avoid dust,. j i.e. about 2 to 5 minutes.

: Working method C (application of several layers): To higher amounts of zinc to be applied to the grains of sand and / or to use additional components or to improve adhesion of paint films, first becomes a binder layer applied to the grains of sand, then a layer of zinc or the additional components, then another layer of binder and so on ο The last layer should be made of zinc. The procedure can be carried out with or without a solvent be carried out and with regard to the type and number of different Layers are not restricted.

The examination of the irradiated steel sheets is carried out in accordance with Example 1 . _ .. '

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Table V

Art the Manufacturing the Abrasive compositions AWAY g g

Epoxy resin A 9 9. MIBK 2 - Xylene 6th - Ox 3 - Zinc dust 100 100 sand 1,000 1000 Rust population number 8 3 hours. 13 hours Ross rating number 6 5 hours 16 hours

A = with solvent B = without solvent

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Table VI

Art • the Manufacturing the Abrasive compositions Method. C. G g g

sand

Epoxy resin A zinc dust

Epoxy resin A zinc dust

1000 1000 1000 5
50 5
Zinc oxide:
38 5
graphite
15th VJl VJl VJl 50 50 50 6 hours 7 hours 8 hours 8 hours 8 hours 9 hours

Rust ~ Rating 3 Number 8
Rust rating number 6

Example 4

This example illustrates the abrasive yields verifiable from the table below Viio the use of once-only usable Schleifmittelnο The nature and composition of the ray treatment is carried out with the device number ₀ 1, wherein by means of treatment times 3 seconds identical results are obtained as in purification treatments of conventional type. For comparison, an abrasive composition with corundum is also tested, ie an abrasive which can be used several times. Examination of the treated

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Steel sheets are made according to Example 1 -

■ '' ■ Table ¥ 11

Abrasives additive et zmagen

(made without solvents)

Sand 1000

j copper slag - 1000

Corundum. - - 1000

Epoxy resin A 9 '9 2

ZincBtaiib. 100 100 50

9 22nd * 9 100 23 100 13th Hours. hours 16 Hours. hours

RoBt rating number 8 13 hours - 22 hours 17 hours. Grate evaluation number 6 16 hours 23 hours 23 hours

In a corresponding manner, abrasives are also tested which can be used several times. The abrasive compositions are produced with and without the use of solvents. In the test listed as the equivalent without the use of a binder, the wire cut and the zinc component are rotated together for 2 hours without being dust-free. Bä in the last hour of mixing the amount of dust no longer shows any change _t the mixing treatment is stopped after 2 hours.

20982? / 1032

To determine the influence of the treatment time "are already Corroded sheet metal cleaned after the abrasive 1/2 "or Has been in use for 1 hour. The results obtained are summarized in Table VIII below.

Table VIII Abrasive compositions

Device no ₀ 2

Device Fr. 3

Device no _o 1

Sections of wire steel lcies
corundum
Epoxy resin A

Epoxy resin B

Prehydrolyzed ethyl silicate

Isopropanol

Ox

Zinc dust

1000 1000

1000

1000

80 80

- 5 - 1000 - 5 1000 2, VJl - 12th 2, VJl 12th 2, - - 2, - _ 14th _ - - - 7th - - - - 6th - - - 80 100 100 80 100

Food evaluation number 8 (Stdo) To

1/2 hour radiation treatment (hours) after

1 hour blasting treatment (hours)

1.5 16

0.5

15 11

12 4

Rust rating number 6 (hours) after

1/2 hour radiation treatment (hours) after
1 hour dto. (Stdo)

4th
1

16
13th

5 2.5

209827/1032

Claims (1)

2161843 Patent claims: Π.) Process for simultaneous cleaning by means of jet ^K - ^y against treatment and protective for applying a / corrosion metal at metal surfaces using a mixture of abrasive and protection metal, characterized ₉ which comprises using an abrasive, wherein the Scliutzmetall means of a binder with the abrasive "grains is adhesively joined" 2. The method according to claim 1, characterized in that alo protective metal zinc is used 3. The method according to claim 1 and 2, characterized in that that in addition, the suitability of the metal surface as Coating carrier-promoting component with the abrasive grain is adhesively connected ο 4. The method according to claim 3, characterized in that al egg Zupati / .koraponente zinc oxide is used. ¹ Jc method according to claim 1 bin 4, characterized in that ανά ', η clLo individual hollow Lfm Lt- tel grains at least partially with elneiii coating au; j the Bi η Ί ami. fc te 1 provided π Lud and dans du :: fjchu Itwü ' ¹ tHl 1 on the Hunseren Obnrf Lache des Bi mi f. · - KiL! In! üi! r: '. u :: iäij ari {; & vu Lchor L i r, l ., 2 Cj 9; i_2 "//.IUJJ Method according to claim 1 to 5, characterized in that the abrasive grains have a lower density * than that Have protective metal and 'that in at least some of the grains, the protective metal is only enriched on one side of the same is. 7. The method according to claim 1 to 6, characterized in that that the abrasive grains have a number of superposed layers, each of which is the protective metal ι and / or contains the suitability of the metal surface as a paint carrier promoting component, and that at least the outermost layer contains the protective metal 8ο Method according to claim 1 to 7, characterized in that that one uses an abrasive, which is partly made of abrasive grains without protective metal and partly from Consists of abrasive grains with binder and protective metal. 9 ·) Sole composition for carrying out the method according to claim 1 to 8, characterized in that there is at least partially made of sole fine grains on which a protective metal bonded by means of a binding agent is present. l () o Abrasive tools according to claim 9, characterized in that dasi »ο ie aLr> ίϊο hat knee ta. 1.1 zinc crithäl U BATH 11. Abrasive composition according to claim 9 or 10, characterized in that a mixture of protective metal and a component promoting the suitability of the metal surface as a paint carrier by means of the binding agent is bound to the abrasive grains. The 12o abrasive composition of claim 11 characterized marked that the abrasive grains are provided with a mixture of zinc and zinc oxide ο 13 ° abrasive composition according to claims ' j to 11, characterized in that the individual abrasive grains at least partially have a coating of the binding agent, and that the protective metal is enriched on the outer surface of the binding agent coating ο 14-Ο abrasive composition according to claim 9 to 13, characterized characterized in that the abrasive grains have a lower density than the protective metal, and that at at least some of the grains are enriched with the protective metal only on one side thereof 15- abrasive composition according to claim 9 to 14, characterized characterized in that the abrasive grains have a plurality of superposed layers of each of which supports the protective metal and / or a component that promotes the suitability of the metal surface as a paint carrier contains, and that at least the outer layer contains the protective metal 209827/1032 16. A method for producing an abrasive composition according to claim 9 "to 15, characterized in that first the binder and then the protective metal on the Applies abrasive grains. 17. A method for producing an abrasive composition according to claim 14, characterized in that a mixture of protective metal and binder is sprayed onto a bed consisting of the abrasive grains, which bed moves relative to the direction of spraying _{or the like} . Method according to claim 17, characterized in that the bed of abrasive grains is formed by a curtain of falling grains ο 13827/1 0 32