The "Water resistance of Toyota TSH1505G paint film" standard developed by the Toyota vehicle company describes a procedure to determine the water resistance of the paint film on vehicles.
This standard was designed based on the “ASTM D870-15 Standard practice for testing the water resistance of coatings using water immersion” standard developed by the American Society for Testing and Materials (ASTM). The water resistance properties of coatings are determined by the test method described in this standard. In this way, possible material failures are prevented and the way for higher quality production is paved.
Condensation testing of coatings aids in specification acceptance, quality control, research and development of coatings and materials. This technique is valid for metals, plastics or wooden samples where the coating faces the interior of the room. This testing method continues by immersing the coated samples in water in a corrosion-resistant container.
Exposure conditions are variable, and tests are conducted at various temperature ranges, observing and reporting changes in color, blistering, loss of adhesion, softening, or embrittlement. Water penetrates the coating at rates that depend on the coating properties and the water temperature. Because the effects of water exposure can change rapidly, samples are evaluated within a minimum of 5 minutes and a maximum of 10 minutes after being removed from the test.
“The test method described in the Toyota TSH1505G standard is particularly important for quality assurance and durability control of coatings. A detailed analysis determines the water resistance properties.
While performing these tests, the coated samples are partially or completely immersed in water in a corrosion-resistant container. Exposure conditions are varied by selecting:
Water penetrates the coating at rates that depend on the properties of the coating and the temperature of the water. Meanwhile, effects such as color change, blistering, loss of adhesion, softening or embrittlement are observed and reported.
Water immersion may cause coatings to deteriorate. Information on how a coating resists immersion in water is helpful in estimating its service life. Failure in the water immersion test can be caused by a variety of factors, such as a deficiency in the coating itself, contamination of the substrate, or inadequate surface preparation. Therefore, the test is useful in evaluating coatings alone or complete coating systems.
Water immersion tests are used for research and development of coatings and substrate processes, specification acceptance, and quality control in manufacturing. These tests typically result in a determination of pass or fail, but the degree of failure can also be measured. If there is no evidence of water-related failure after a certain period of time, the coating system is considered successful.
Results obtained from water immersion tests should not be represented as equivalent to time exposure to water in the natural environment until the degree of quantitative correlation has been determined for the coating or coating system.
Corrosion tests of a marked coating on a ferrous substrate are impractical in water immersion tests as corrosion products tend to contaminate the water bath. Sometimes the test tank may need to be constantly flooded to maintain consistent water quality.
The main apparatus used in these tests includes:
The circulation system ensures that all water in the tank is exposed to room air so that the water does not stratify at lower levels and oxygen is not depleted.
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