JP2004069613A - Coolant anticorrosion service life judging device and coolant anticorrosion service life judgment composition - Google Patents

Abstract

To easily and quickly determine the anticorrosion life of an engine coolant in a short period of time.
A container (1) forming an enclosed space therein, a coolant sample (2) placed in the container (1), and an engine cooling system that can use the coolant sample (2) in contact with the engine coolant in an engine cooling system. A plurality of deterioration accelerating substances (iron rust 4a, rubber material 5, brass plate 6, and oxygen 7) composed of substances capable of deteriorating the liquid; and an assembled metal test piece 3 made of the same material as a member constituting the engine cooling system And At least one of the deterioration promoting substances has a component amount relative to the amount of the coolant sample 2 larger than an actual component amount relative to the amount of the engine coolant used in the engine cooling system.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coolant anticorrosion life determining device and a composition for judging the anticorrosion life of an engine coolant used in, for example, an engine cooling system of an automobile.
[0002]
[Prior art]
In a water-cooled automobile engine, a desired cooling effect is ensured by circulating a coolant in a water jacket provided on a cylinder block, a cylinder head, and the like. The engine coolant used in such an engine cooling system generally includes ethylene glycol as a main component, various anticorrosion additives such as iron, aluminum, and copper, and a small amount of an antifoaming agent and a coloring agent. And water for dissolving some anticorrosive additives that are hardly soluble in ethylene glycol.
[0003]
Here, various anticorrosion additives are added to the engine coolant in order to prevent the water jacket and the radiator from being corroded by the circulation of the coolant. The iron-based anticorrosion additive is an additive for preventing the corrosion of iron and iron alloys, and the aluminum-based anticorrosion additive is an additive for preventing the corrosion of aluminum and aluminum alloys. In addition, copper-based anticorrosion additives are additives for preventing copper and copper alloys from corroding.
[0004]
However, such engine coolants degrade as they are used or due to changes over time, reducing the anti-corrosion effect.
[0005]
Long-life coolant (LLC), which has a recommended replacement period of 2 years (3 years at initial vehicle inspection), is currently being used by each manufacturer as an engine coolant for automobiles. However, there is a strong demand for a longer life. For this reason, when developing a new LLC, it is necessary to determine how much anticorrosion life the newly developed LLC has.
[0006]
Here, as one of the evaluation tests for evaluating the anti-corrosion performance of the engine coolant, there are a metal corrosion test and a circulation corrosion test defined in JISK2234. For example, in the circulating corrosion test, a pipe in which an upper hose, a lower hose, and various valves are interposed is connected to an actual radiator for an automobile, and a water pump driven by a motor is connected to the pipe to circulate a coolant circulation circuit. And a circulating corrosion apparatus in which a heating test tank containing a metal test piece is connected in the circulation circuit. Then, a test is performed in which the coolant circulating in the circulation circuit is heated by the temperature controller of the heating test tank to simulate the condition of being heated by the actual engine, and the coolant is circulated for a predetermined time. The corrosion prevention performance of the coolant is evaluated by examining the amount of corrosion of the pieces and examining the remaining amount and concentration of various corrosion inhibitors in the coolant after the test.
[0007]
Japanese Patent Application Laid-Open No. 9-127095 discloses gas supply means for supplying oxygen gas into a heating test tank, and exhaust means capable of arbitrarily controlling the pressure in the heating test tank in accordance with the gas supply amount. A cooling liquid evaluation test apparatus in which a heating test tank having the following formula is installed in a cooling liquid circulation circuit is disclosed.
[0008]
According to the coolant evaluation test apparatus, the test can be performed under the same heating conditions and pressure conditions as those of the engine cooling system of the actual vehicle.
[0009]
[Problems to be solved by the invention]
However, the above-described conventional corrosion resistance evaluation test is useful as an initial quality evaluation of an engine coolant, but is not sufficient for use as a durability evaluation method.
[0010]
For example, the metal corrosion test specified in JIS K 2234 is performed at an engine coolant temperature of 88 ° C. for 336 hours, but under such conditions of the temperature and time, the engine coolant itself does not deteriorate much. Therefore, in this metal corrosion test, it is possible to evaluate the metal corrosion protection performance of a new engine coolant, but it is not possible to determine the corrosion prevention life of the engine coolant.
[0011]
It should be noted that if the engine coolant that has been used and deteriorated in an actual vehicle for about two to three years is collected and the above-described metal corrosion test is performed on the collected coolant, the metal corrosion protection performance of the deteriorated engine coolant is evaluated. Therefore, the anticorrosion life of the engine coolant can be determined. However, the evaluation of the anticorrosion property by the actual vehicle test requires a large-scale test facility and requires a large cost. Further, it is not realistic to perform a test requiring about two to three years when determining the anticorrosion life of a newly developed LLC.
[0012]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a coolant anticorrosion life determining apparatus and a coolant anticorrosion life determining composition capable of easily and quickly determining the anticorrosion life of an engine coolant. Is a technical problem to be solved.
[0013]
[Means for Solving the Problems]
The coolant anticorrosion life judging device of the present invention for solving the above-mentioned problems includes a container forming an enclosed space therein, a coolant sample placed in the container, and an engine cooling system in which the coolant sample can be used. A plurality of deterioration promoting substances which are made of a substance capable of deteriorating the engine cooling liquid in contact with the engine cooling liquid and which are contained in the container so as to come into contact with the cooling liquid sample; At least one of them is characterized in that the component amount with respect to the amount of the coolant sample is larger than the actual component amount with respect to the amount of the engine coolant used in the engine cooling system.
[0014]
In this coolant anticorrosion life determination device, a coolant sample is placed in a container, and the coolant sample is made of a substance which can be used in an engine cooling system to be able to contact the engine coolant and deteriorate the engine coolant. A deterioration promoting substance is placed in the container so as to be in contact with the coolant sample. Therefore, by heating the container at a predetermined temperature and for a predetermined time, deterioration of the coolant sample by the deterioration promoting substance is promoted. Moreover, in the coolant anticorrosion life judging device of the present invention, the component amount with respect to the amount of at least one coolant sample among the deterioration promoting substances is larger than the actual component amount with respect to the amount of engine coolant used in the engine cooling system. Have been. For this reason, the deterioration of the coolant sample is further promoted by the deterioration promoting substance having a component amount larger than the actual component amount in the engine coolant, and the coolant sample is deteriorated in a short period of time.
[0015]
Then, for example, the corrosion prevention life of the coolant can be determined by measuring the component concentration, the remaining amount of various anticorrosion additives, and the like for the deteriorated coolant sample. Therefore, the anticorrosion life of the engine coolant can be easily determined in a short time.
[0016]
In a preferable aspect, the coolant anticorrosion life determining device of the present invention includes at least iron rust, rubber, brass, and oxygen as the deterioration promoting substance.
[0017]
The role of each of these deterioration promoting substances is described below.
[0018]
Iron parts such as iron block engines and iron pipes are used in the engine cooling system. Then, before the engine coolant is sealed in the engine cooling system, iron rust generated in the cooling system is one factor that deteriorates the engine coolant. The iron rust reduces phosphoric acid and the like added as an anticorrosive additive in the engine coolant, and promotes oxidative deterioration of ethylene glycol, which is a main component of the engine coolant. For this reason, by putting iron rust as a deterioration promoting substance into the container, it is possible to reduce anticorrosion additives such as phosphoric acid in the coolant sample and to promote oxidative deterioration of ethylene glycol.
[0019]
In the engine cooling system, rubber is used as a water hose. The zinc contained in the rubber reduces the triazole added as an anticorrosion additive in the engine coolant. For this reason, triazole as an anticorrosive additive in a coolant sample can be reduced by putting rubber in a container as a deterioration promoting substance.
[0020]
Further, a temperature sensor made of brass, a thermostat, or the like is used in the engine cooling system. The brass reduces the amount of triazole added as an anticorrosion additive in the engine coolant, and promotes the oxidative deterioration of ethylene glycol, which is the main component of the engine coolant. For this reason, by placing brass as a deterioration promoting substance in a container, it is possible to reduce triazole as an anticorrosive additive in a coolant sample or to promote oxidative deterioration of ethylene glycol.
[0021]
Oxygen is dissolved in the engine coolant enclosed in the engine cooling system. This oxygen promotes the oxidative degradation of ethylene glycol. For this reason, the oxygen degradation of ethylene glycol can be promoted by putting oxygen in the container as a degradation promoting substance.
[0022]
Therefore, the coolant sample can be surely deteriorated by putting at least iron rust, rubber, brass and oxygen as deterioration-promoting substances into the container so as to contact the coolant sample.
[0023]
In a preferred embodiment, the coolant anticorrosion life judging device of the present invention is a metal test piece made of the same material as a member constituting the engine cooling system and placed in the container so as to be in contact with the coolant sample. It has.
[0024]
According to this aspect, after the coolant sample is deteriorated, by measuring the mass change amount of the metal test piece, it is possible to evaluate the anticorrosion performance of the coolant sample in the deteriorated state, and from the result The deterioration life of the coolant sample can be determined. Therefore, the anticorrosion life of the engine coolant can be determined more easily and in a short time.
[0025]
The coolant anticorrosion life determining composition of the present invention that solves the above-mentioned problem is a coolant anticorrosion life determining composition used to determine the anticorrosion life of a coolant sample by contact with a coolant sample. An engine cooling system in which the coolant sample can be used, a plurality of deterioration promoting substances made of a substance capable of contacting the engine coolant and deteriorating the engine coolant, and at least one of the deterioration promoting substances First, the amount of the component relative to the amount of the coolant sample is larger than the actual amount of the component relative to the amount of the engine coolant used in the engine cooling system.
[0026]
When judging the corrosion prevention life of the coolant, the coolant sample can be deteriorated in a short period of time by bringing the composition for judging the corrosion protection life of the present invention into contact with the coolant sample. Then, for example, by measuring the component concentration, the remaining amount of various anticorrosion additives, and the like for the deteriorated coolant sample, the anticorrosion life of the coolant can be determined. Therefore, the anticorrosion life of the engine coolant can be easily determined in a short time.
[0027]
In a preferred embodiment, the composition for judging the anticorrosion life of a coolant according to the present invention contains at least iron rust, rubber, brass and oxygen as the deterioration promoting substance.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
[0029]
(Embodiment 1)
The coolant anticorrosion life determining device of the present embodiment shown in FIG. 1 has a container 1 forming an enclosed space therein, a coolant sample 2 placed in the container 1, and a coolant sample 2. An assembled metal test piece 3 immersed in a coolant sample 2 in a container 1 and an iron rust as a deterioration promoting substance immersed in the coolant sample 2 in the container 1 so as to come into contact with the coolant sample 2 An iron powder 4 with 4a, a rubber material 5, a brass plate 6, and oxygen 7 as a deterioration promoting substance supplied into the container 1 so as to be in contact with the coolant sample 2 are provided.
[0030]
The container 1 includes a container body 11 and a lid 13 to which a packing 12 for sealing is fixed on the back surface. Here, the container body 11 and the lid 13 are made of stainless steel (SUS), and the packing 12 is made of silicone rubber. The material forming the container 1 is not limited to these materials, and may be a material having a predetermined heat resistance and pressure resistance and not reacting with the coolant sample 2.
[0031]
The lid 13 of the container 1 is provided with an oxygen inlet 14 with an on-off valve 14a. The oxygen injection port 14 is connected to an oxygen gas supply device and an exhaust device via a switching valve (not shown). The inside of the container 1 can be exhausted by the exhaust device, and oxygen gas at a predetermined pressure is supplied by the oxygen gas supply device. It can be supplied.
[0032]
The coolant sample 2 is composed of ethylene glycol as a main component, various anticorrosion additives such as iron, aluminum, and copper, a small amount of an antifoaming agent and a coloring agent, and a part of anticorrosion that is hardly soluble in ethylene glycol. And water for dissolving the additive.
[0033]
As shown in FIG. 2, the assembled metal test piece 3 includes first to sixth six metal test pieces 31 to 36 and a cylindrical guard portion 37 made of stainless steel (SUS). The first to sixth metal test pieces 31 to 36 are housed in a cylindrical guard portion 37 in order to avoid contact with a deterioration promoting substance or the like put in the container 1.
[0034]
And each metal test piece 31-36 is selected from the member which comprises the engine cooling system in which the coolant sample 2 can be used, or its standard. Specifically, the first metal test piece 31 is made of an aluminum radiator tube itself, the second metal test piece 32 is made of an aluminum casting AC2A as a standard material constituting an engine cooling system, and the third metal test piece 33 is made of The fourth metal test piece 34 is made of steel SPCC as the standard material, the fifth metal test piece 35 is made of brass C3604 as the same standard material, and the sixth metal test piece 36 is made of cast iron FC200 as the same standard material. Is made of copper C1100 as the standard material.
[0035]
The iron powder 4 with iron rust 4a is made by rusting 3 g of 27 g of 20 to 60 mesh iron powder and contains 3 g of iron rust 4a.
[0036]
The rubber member 5 is made of a water hose material (EPDM rubber) which is a component of the engine cooling system.
[0037]
The brass plate 6 is wound in a spiral manner so as to increase the surface area thereof while suppressing the volume occupied by the brass plate 6 in the container 1.
[0038]
The oxygen 7 is supplied by putting the cooling liquid sample 2, the assembled metal test piece 3, the iron powder 4 with iron rust 4a, the rubber material 5, and the brass plate 6 in the container body 11 and sealing the lid 13, and then exhausting the gas (not shown). After the inside of the container 1 is evacuated, the oxygen gas is supplied into the container 1 at a predetermined pressure from an oxygen gas supply unit (not shown). The exhaust of the container 1 and the supply of the oxygen 7 are performed for each cycle of a heating test described later. After the supply of the oxygen gas, the on-off valve 14a of the oxygen inlet 14 is closed.
[0039]
Here, the component amounts of the iron rust 4a, the rubber material 5, the brass plate 6, and the oxygen 7 as the deterioration accelerating substances were determined as follows.
[0040]
As described above, the iron rust 4a reduces phosphoric acid and the like added as an anticorrosion additive in the engine coolant, and promotes oxidative deterioration of ethylene glycol, which is a main component of the engine coolant. Further, the rubber material 5 reduces triazole added as an anticorrosive additive in the engine coolant. As described above, the iron rust 4a and the rubber material 5 as the deterioration accelerating substances added for the purpose of reducing the anticorrosion additive in the engine coolant have a component amount based on the amount of the coolant sample 2 put in the container 1. The amount is set equal to the actual component amount with respect to the amount of the engine coolant used in the engine cooling system (equivalent amount in an actual vehicle).
[0041]
On the other hand, the brass plate 6 reduces triazole added as an anticorrosive additive in the engine coolant and promotes oxidative deterioration of ethylene glycol which is a main component of the engine coolant. The oxygen 7 promotes the oxidative degradation of ethylene glycol. As described above, the brass plate 6 and the oxygen 7 as the deterioration accelerating substances added for the purpose of oxidizing and deteriorating ethylene glycol, which is the main component of the engine coolant, have a component amount with respect to the coolant sample 2 put in the container 1. It is set to be much larger than the actual component amount with respect to the amount of engine coolant used in the engine cooling system.
[0042]
At this time, the degree of increasing the component amounts of the brass plate 6 and the oxygen 7 as the deterioration promoting substance added for the purpose of oxidizing and deteriorating the ethylene glycol depends on the deterioration state of the coolant sample after the test under the predetermined heating conditions. The deterioration state of the engine coolant after traveling a predetermined distance in the actual vehicle was substantially the same, that is, the deterioration state of the coolant sample after the test under the predetermined heating conditions, the vehicle traveled the predetermined distance in the actual vehicle. It can be adjusted so as to be equivalent to the state of deterioration of the engine coolant later.
[0043]
In addition, by making the component amounts of the iron rust 4a and the rubber material 5 as deterioration accelerating substances added for the purpose of reducing the anticorrosive additive in the engine coolant equal to the actual component amounts (equivalent to the actual vehicle), The coolant sample can be deteriorated to an extent corresponding to the state of deterioration of the engine coolant after traveling a predetermined distance in an actual vehicle. Further, the components of the brass plate 6 and the oxygen 7 as the deterioration promoting substances added for the purpose of oxidizing and deteriorating the ethylene glycol in the engine coolant are considerably larger than the actual amounts of the components. Is performed in a shorter time than the actual vehicle.
[0044]
In the coolant anticorrosion life determining device of the present embodiment having the above-described configuration, the coolant sample 2 is placed in the container 1 and the same material (structure) as a member constituting an engine cooling system in which the coolant sample 2 can be used. An assembled metal test piece 3 made of a member itself or its standard material), iron rust 4a as a deterioration accelerating substance made of a substance that can contact the engine coolant and degrade the engine coolant in the engine cooling system, a rubber material 5, a brass plate 6 and oxygen 7 are placed in the container 1 so as to be in contact with the coolant sample 2. For this reason, by heating the container 1 at a predetermined temperature and time, the deterioration of the coolant sample 2 by the deterioration promoting substance is promoted. Moreover, in the coolant anticorrosion life judging device of this embodiment, the component amount of the brass plate 6 and the oxygen 7 among the deterioration accelerating substances with respect to the amount of the coolant sample 2 is actually smaller than the amount of the engine coolant used in the engine cooling system. Is larger than the amount of the component. For this reason, the deterioration of the coolant sample 2, specifically, the oxidative degradation of ethylene glycol, is further promoted by the brass plate 6 and the oxygen 7, and the coolant sample 2 deteriorates in a short period of time.
[0045]
Then, after the coolant sample 2 is deteriorated, by measuring the mass change amount of each of the metal test pieces 31 to 36, the anticorrosion performance of the coolant sample 2 in the deteriorated state can be evaluated. From the result, it is possible to determine the deterioration life of the coolant sample. Therefore, the anticorrosion life of the engine coolant can be determined more easily and in a short time.
[0046]
(Other embodiments)
In the coolant anticorrosion life judging device shown in the first embodiment, the assembled metal test piece 3 is placed in the container 1 and the mass change of the metal test pieces 31 to 36 after the test is measured, whereby the coolant sample 2 is measured. Although the example in which the anticorrosion life of the cooling liquid sample 2 is determined is described, the anticorrosion life of the coolant sample 2 can be determined without putting the assembled metal test piece 3 in the container 1. For example, by measuring the component concentration of ethylene glycol, the remaining amount of various anticorrosion additives, and the like for the deteriorated cooling liquid sample 2, the anticorrosion life of the cooling liquid can be determined.
[0047]
Further, in the above embodiment, an example was described in which the deterioration promoting substances were sealed together with the coolant sample 2 in the container 1, but the test may be performed while the coolant sample is circulated in the circulation circuit. In this case, each of the deterioration promoting substances is arranged in the circulation circuit so as to be able to come into contact with the coolant sample. It may be adjusted so as to be larger than the actual component amount with respect to the amount of engine coolant in the engine cooling system.
[0048]
It is also possible to add a substance other than the iron rust 4a, the rubber material 5, the brass plate 6, and the oxygen 7 as the deterioration promoting substance.
[0049]
【Example】
Using the coolant anticorrosion life determination device described in the first embodiment, as a coolant sample A, a commercially available engine-containing coolant having a recommended replacement period of 2 years (3 years at initial vehicle inspection), and a coolant sample As B, a test was carried out under a predetermined heating condition with an amine-free type commercial engine coolant having a recommended replacement period of 7 years or 160,000 km.
[0050]
In this test, the amount of the coolant sample placed in the container 1 was 800 cm ³ . Then, heating at 120 ° C. × 120 hours and heating at 25 ° C. × 48 hours were sequentially performed (total heating time is one week), and this was defined as one cycle, and 3 to 5 cycles were repeated.
[0051]
As the iron powder 4 with the iron rust 4a, a powder obtained by rusting 3 g of 27 g of 20 to 60 mesh iron powder (containing 3 g of iron rust 4a) was used. 13 g. The brass plate 6 was made of C2680 and had a surface area of 1600 cm ² . The surface area of the brass plate 6 with respect to the amount of the coolant sample is set to be much larger than 50 times or more of the actual surface area of the brass with respect to the amount of the engine coolant used in the engine cooling system. Oxygen 7 was exhausted from the inside of the vessel 1 before each cycle, and then supplied into the vessel 1 at a pressure of 0.098 MPa. Thus, the oxygen gas was sufficiently supplied into the container 1.
[0052]
Further, in the present embodiment, the deterioration state of the coolant sample after one week test under the above-mentioned heating condition and the deterioration state of the engine coolant after traveling 40,000 km in an actual vehicle are similar, that is, The brass plate 6 and the oxygen 7 were decomposed so that the state of deterioration of the coolant sample after one week of testing under the above heating conditions was equivalent to the state of deterioration of the engine coolant after traveling 40,000 km in an actual vehicle. The component amounts have been adjusted.
[0053]
Each time one cycle was completed, the assembled metal test piece 3 was taken out of the container 1 and the weight loss of each of the metal test pieces 31 to 36 was measured. The results are shown in FIGS.
[0054]
FIG. 3 shows the test results of the first metal test piece 31 made of aluminum tube material, FIG. 4 shows the test results of the second metal test piece 32 made of aluminum casting AC2A, and FIG. FIG. 6 is a test result of a fourth metal test piece 34 made of steel SPCC, and FIG. 7 is a test result of a fifth metal test piece 35 made of brass C3604. FIG. 8 shows the test results of the sixth metal test piece 36 made of copper C1100.
[0055]
As is clear from these figures, for the coolant sample A, when the test time exceeds one week (one cycle), the third metal test piece 33 made of cast iron FC200 and the fourth metal test piece made of steel SPCC 34 and the mass was greatly reduced. As a result, it was found that when the traveling distance of the coolant sample A exceeded 40,000 km, the deterioration became remarkable, and the corrosion protection performance of cast iron and steel was extremely reduced. Therefore, it can be determined that the anticorrosion life of the coolant sample A is about 40,000 km. In addition, when the coolant sample A is actually used for a long time in the engine cooling system of the actual vehicle, a phenomenon in which the iron pipe is corroded has been observed, which is consistent with the test results of this example.
[0056]
On the other hand, with respect to the coolant sample B, even after 5 weeks (5 cycles), the first to sixth metal test pieces 31 to 36 did not show a large decrease in mass. As a result, it was found that this coolant sample B had an extremely long anticorrosion life.
[0057]
Therefore, by using the coolant anticorrosion life determination device of the present embodiment, the anticorrosion life of the engine coolant can be easily and quickly reduced without performing the anticorrosion evaluation by a real vehicle test that requires a lot of time and cost. It turns out that it is possible to judge.
[0058]
【The invention's effect】
As described above, according to the present invention, the deterioration of the coolant sample is further promoted by the deterioration promoting substance having a component amount larger than the actual component amount in the engine coolant, and the coolant sample is deteriorated in a short period of time. Therefore, the anticorrosion life of the engine coolant can be determined easily and in a short period of time without performing the anticorrosion evaluation by an actual vehicle test that requires much time and cost.
[0059]
Therefore, the anti-corrosion life of the engine coolant can be efficiently determined, which can contribute to improving the performance of the engine coolant and promoting its development.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a coolant anticorrosion life determining device according to an embodiment of the present invention.
FIGS. 2A and 2B show an assembled metal test piece which is a component of the above-described apparatus for judging the anticorrosion life of a coolant, wherein FIG. 2A is a plan view and FIG.
FIG. 3 is a diagram showing a relationship between a change in mass of a first metal test piece 31 made of an aluminum tube material and a test time.
FIG. 4 is a diagram showing a relationship between a change in mass of a second metal test piece 32 made of an aluminum casting AC2A and a test time.
FIG. 5 is a diagram illustrating a relationship between a change in mass of a third metal test piece 33 made of cast iron FC200 and a test time.
FIG. 6 is a diagram showing a relationship between a change in mass of a fourth metal test piece 34 made of steel SPCC and a test time.
FIG. 7 is a diagram showing a relationship between a change in mass of a fifth metal test piece 35 made of brass C3604 and a test time.
FIG. 8 is a diagram showing a relationship between a change in mass of a sixth metal test piece 36 made of copper C1100 and a test time.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Container 2 ... Coolant sample 3 ... Assembled metal test piece 4a ... Iron rust 5 ... Rubber material 6 ... Brass plate 7 ... Oxygen

Claims (5)

A container forming an enclosed space therein, a coolant sample placed in the container, and a substance capable of deteriorating the engine coolant by coming into contact with the engine coolant in an engine cooling system in which the coolant sample can be used Comprising a plurality of deterioration promoting substances contained in the container so as to contact the coolant sample.
At least one of the deterioration promoting substances is characterized in that a component amount with respect to the amount of the coolant sample is larger than an actual component amount with respect to the amount of the engine coolant used in the engine cooling system. Coolant anticorrosion life judgment device. 2. The coolant anticorrosion life judging device according to claim 1, wherein the deterioration accelerating substance comprises at least iron rust, rubber, brass and oxygen. The metal test piece made of the same material as a member constituting the engine cooling system and placed in the container so as to be in contact with the coolant sample is provided. Coolant anticorrosion life judgment device. A coolant anticorrosion life determining composition used to determine the shrinkage life of the coolant sample by contact with the coolant sample,
The coolant sample is composed of a plurality of deterioration promoting substances made of a substance capable of deteriorating the engine coolant in contact with the engine coolant in an engine cooling system in which the coolant sample can be used,
At least one of the deterioration promoting substances is characterized in that a component amount with respect to the amount of the coolant sample is larger than an actual component amount with respect to the amount of the engine coolant used in the engine cooling system. A composition for judging the anticorrosion life of a coolant. 5. The composition for judging the anticorrosion life of a coolant according to claim 4, wherein the deterioration promoting substance contains at least iron rust, rubber, brass and oxygen.

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