A coating is a protective layer applied to a variety of surfaces, designed to provide aesthetics and resistance to external environmental factors. In order to ensure the performance and durability of the coating film, the coating industry has carried out a series of chemical and corrosion resistance tests. This article will explain the importance of these tests as well as the principles and methods of testing.

Water resistance test

Water resistance test is one of the methods to evaluate the resistance of the film to water. In this test, the painted test board is soaked in water to observe whether there is whiteness, loss of light, foaming, falling off and other phenomena, as well as the degree of difficulty to restore the state. The principle of this test is that the paint often comes into contact with humid air or moisture during use, which causes the paint film to expand and permeate, thus affecting its performance and life.

Salt water resistance test

The salt water resistance test is used to assess the resistance of the film to salt water erosion. In the test, the film is not only soaked and expanded by water, but also permeated by chloride ions in the brine, which may lead to water resistance problems, but also may cause damage such as rust spots and rust.

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Test for resistance to petroleum products

Petroleum Product resistance test evaluates the resistance of the coating to petroleum products (e.g. gasoline, lubricating oil, solvents, etc.). Because modern industrial products are often in contact with these petroleum products, the paint film must have the ability to resist these chemicals.

Chemical reagent resistance test

Chemical resistance tests are used to assess the resistance of the film to acid, alkali and other chemicals. At the specified temperature and time, the erosion of the coating film by the medium was observed.

Solvent resistance test

Solvent resistance test to assess the resistance of the film to organic solvent erosion. The test method includes placing the sample in the specified medium and observing whether the coating film has any phenomenon such as loss of light, discoloration, foaming, spots, shedding, etc.

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Resistance to household chemical tests

A household chemical resistance test, also known as a contamination test or a wash resistance test, assesses whether the film retains its original properties after being cleaned with liquid soap and synthetic detergents. This is because when the coating comes into contact with household cleaners, if stained or eroded, it will affect its decorative and protective functions.

Chemical gas resistance test

Chemical gas resistance test to assess whether the film is damaged by loss of light, silk, mesh or wrinkling under the action of chemical gases such as industrial waste gas and acid fog. This test simulates actual application conditions by using SO2 or NH3 for corrosion resistance to chemical gases.

In summary, chemical and corrosion resistance testing is essential to ensure the quality and performance of the film. Through these tests, coating manufacturers are able to provide longer lasting and more durable coating products that meet the needs of a variety of application areas, thus ensuring that the coating performs well in different environments. These tests provide important assurance for the reliability and long-term use of the film.