Films are protective layers applied to a variety of surfaces designed to provide aesthetics and resistance to external environmental factors. To ensure film performance and durability, the Coating industry conducts a series of chemical and corrosion resistance tests of films. This article describes the importance of these tests and the principles and methods of testing.
Water resistance test
The water resistance test is one of the methods to evaluate the resistance of a film to water. In this test, the painted test board is immersed in water to observe whether there is blushing, loss of light, blistering, peeling, etc., and how easy it is to restore the state. The principle of this test is that Coating is often exposed to humid air or moisture during use, which causes the paint film to expand and penetrate, thereby affecting its performance and life.
Resistance to saline water
The saline water resistance test is used to assess the resistance of the film to saline water erosion. In the test, the film is not only immersed and swelled by the water, but also penetrated by chloride ions in the saline water, which can cause water resistance problems, and can also cause damage such as rust spots and rust.
Petroleum product resistance test
The petroleum resistance test evaluates the resistance of films to petroleum products (such as gasoline, lubricants, solvents, etc.). Since modern industrial products are often in contact with these petroleum products, paint films must be resistant to these chemicals.
Chemical resistance test
The chemical resistance test is used to evaluate the resistance of the film to acid, alkali and Miscellaneous chemicals. Observe the erosion of the film by the medium at the specified temperature and time.
Solvent resistance test
The solvent resistance test evaluates the resistance of the film to organic solvent erosion. The test method includes putting the sample into the specified medium and observing whether the film appears to lose light, change color, blistering, speckle, peeling and other phenomena.
Household chemical resistance test
Household chemical resistance test, also known as contamination test or scrub resistance test, evaluates whether a film retains its original performance after being washed with soap and synthetic detergent. This is because when the film comes into contact with household cleaners, if it is stained or eroded, it will affect its decorative and protective functions.
Chemical gas resistance test
The chemical gas resistance test evaluates whether the film is damaged by industrial waste gas and chemical gases such as acid mist, such as loss of light, ropiness, reticulation or wrinkling. This test simulates practical application conditions by using SO2 or NH3 for corrosion resistance to chemical gases.
To sum up, chemical and corrosion resistance performance tests are essential to ensure the mass and performance of films. Through these tests, Coating manufacturers are able to provide longer-lasting, more durable film products to meet the needs of various Applications, thus ensuring that films perform well in different environments. These tests provide important guarantees for film Reliability and long-term use.
