SU836218A1 - Solution for cleaning metallic surfaces - Google Patents

Description

(54) SOLUTION FOR CLEANING METAL SURFACES

The invention relates to the chemical treatment of metals, namely to the prevention of corrosion of metals, the removal of scale, crusts. At present, dissolution in solutions of various compositions is widely used to clean metal surfaces from salt deposits, galvanic sludge and oxides. A known solution for chemical cleaning of metal surfaces containing hydrochloric acid, sodium silicate, inhibitors such as formalin, hexamethylenetetramine (hexamine), hydrazine hydrate, alkyl benzosulfonate, kerosene, oxalic acid or citric acid 1, This solution contains a large number of components, in addition has the low rate of sediment dissolution; after the removal of sediments, complex processing is required for both fattening of the solutions and time-consuming rinsing with hot and cold water. The closest to the technical essence is the solution For cleaning metal surfaces containing hydrochloric acid, hexamethy taperamine or formine 2). The disadvantage of this solution when cleaning the metal surfaces of the heaters, the bottom and walls of the baths in the bathroom compartment is the inability to quickly remove deposits, without causing harm to the surfaces being cleaned, especially the surfaces of the heaters. In addition, due to etching of the heaters and welds, cleaning of deposits in this solution was not carried out completely. The purpose of the invention is to intensify the cleaning process and reduce the corrosion of the metal surfaces being cleaned. The goal is achieved by the fact that, in contrast to the well-known invented solution, it additionally contains alkylbenzylpyridinium chloride, phenol and copper acetic acid, and is co-acidic in the following ratio of components, g / l: Hydrochloric acid 220-400 Hexamethylenetetramine (hexamine) 3-1 Alkylbenzylpyridium chloride (kapine)) -eight

Phenol1-3

Copper acetic acid mouse covistosis 0.3-0.6

The introduction of a ternary additive to the hydrochloric acid solution (hexamethylenetetramine) Cataline + phenol + copper acetic acid acid acid reduces the corrosion, the sponge structure is not observed when the metal is corrosive with a corrosive effect.

The solution according to the invention makes it possible to clean metal surfaces from salt deposits, galvanic sludge and oxides, usually salts, oxides, hydroxides of iron, aluminum, nickel, chromium, zinc, magnesium and alkalis; metals in chemical and electrochemical degreasing baths.

Examples of the application of the composition, the results, the cleaning of surfaces with known and proposed compositions showed that the cleaning speed is 2-2.5 times more, surface corrosion is not observed and the appearance of a spongy structure of the etched surfaces.

A layer of sediments 25-30 mm thick with a known solution at 21 ° C is removed over 65 in. The proposed solution is removed in 25-40 minutes (depending on the concentration of hydrochloric acid 400-220 g / l). 2:

The corrosion rate of steel 3 (g / m / h in a known solution - 4-7, in the invented solution - 0.7-0.8.

The time at which constancy of the composition of the washing solution in a 1.5 m bath is reached is 25 minutes.

The method of preparation of the solution

In a small amount of strong (220-400 g / l) hydrochloric acid, the corrosion inhibitor is dissolved with stirring; (catapine, phenol, urotropine, copper, covystocide acetic acid), which is then introduced into the rest of the acid mass,

Golsol acid technical according to GOST 1382-69 and hydrochloric acid reactive pure according to GOST 3118-67 were used in the work; - urotropin technical according to GOST 1381-60; synthetic technical phenol according to GOST 236-68; technical catapine; copper acetic acid sources according to GOST 105-66 ..

The time for complete cleaning of the metal surface of the heaters, the bottom and walls of the degreasing baths from salt deposits, galvanic sludge and oxides has been determined. In addition, the amount of corrosion in these compounds was determined depending on time, effect.

The results are presented, 1 From table. No. 1 shows that the shortest time for cleaning metal surfaces from salt deposits, electroplating and oxides when processing them in solution 1, containing, g / l:

Hydrochloric acid - .350

Catapin (alkylbenzylpyridinium chloride) 8 Phenol.3

Urotropin (hexamethylenetetramine) 1

Copper acetic acid mouse. 0.6

With a decrease in the concentration of hydrochloric acid to 290 g / l and an increase to 400 g / l, the cleaning time is somewhat increased. Use of a corrosion inhibitor containing, g / l:

Katapin6-8

1-3

3-1

0.3-0.6

reliably shakes metal from corrosion.

Industrial industrial inhibitors of urotropine, phenol, a type of catapine, as well as a three-component catapine additive (phenol-urotropine-copper-acetic acid) for corrosion of steel 3 in various rto concentrations of hydrochloric acid solutions showed that industrial inhibitors have an advantage of relatively inopposite, have relatively relatively inoperative, have relatively relatively inoperative, have relatively relatively inoperative, have relatively relatively inoperative, have relatively inherently inoperative. which decrease sharply with increasing concentration; hydrochloric acid from 220 g / l and more, and unalloyed steels in these solutions acquire a spongy structure . With this effect and temperature increase, this phenomenon is intensified,

The results are shown in table 2.

The advantages of the invented solution in comparison with the known, increased purification rate, due to the use of high concentration hydrochloric acid; reliable protection of metal surfaces against corrosion during cleaning, regardless of the processing time.

In addition, heavy manual trul was eliminated in order to remove the sludge, a known solution, wt.% Sodium silicate 5 hydrochloric acid 10 formalin u, 8 urotropin 1, hydrazine. . hydrate15 Alkylbenzene sulfonate 2, Shchalelev-acid-kerosene60 Water Other Solution 1 g / l Catapine 8 Phenol 3 Urotropin. 1 Copper acetic acid copper vinegar 0, Sol per acid. 350 Solution 2 without Sol on kiscapatin, phenol, lot of 290 copper vinegar mouse with co-malic acid. Urotropin 20 g / l. Composition 3, g / l Catapin6; Phenol I Urotropin 3 Copper acetic acid copper oxide 0, Sol per acid220 Composition 4, g / l Catapine 7 Phenol2 Urotropin 2

Table 1 5, 0.02 0.027: 0.045 0.0680.095 .... : 5 H), 0022 0.005 0.01 0.017 0.02 2 0.005 0.01 0.025 0.1 0.25 9 0.002 0.005 0.012 0,015 0.018 2 0.0019 0.005 0.013 0.018 0, J2

Content of ingredients

Composition

Copper-acetic acid covistocide 0.5

Sol on acid300

OST in W 5, g / l Catapine. 7 Phenol .2

Urotropin 3

Copper acetic acid 0.4

Sol on acid400

Continued table. one

(kg / m) through (h) Jl2 18 24

Claims (2)

30 0,002 0 005 i O, 012 0,0170,019 Claims of the Invention Solution for cleaning metal surfaces containing hydrochloric acid and hexamethylene tetra min, as indicated by T for intensifying the process and reducing corrosion of the surface being cleaned / it additionally contains alkyl benzyl pyridinium chloride , phenol and copper coacetate acetic acid mouse in the following ratio of components, g / l: 10 Sol of acid 220-400 Hexamethylenetetramine 3-1 8362 Llkylbenzylpyridinium chloride6-8 Phenol1-3 Copper vinegar mouse of covistrite 0.3-0.6 Sources of information, ny in the examination 1, USSR Copyright Certificate 05975, cl. From 23 g 1/02, 1971. 2. Authors certificate of the USSR 44174, cl. From 23 1/04, 1967.