Testing Coatings For Solvent And Chemical Resistance

摘要

The protective or decorative aspects of a coating depend on its survivability. Coatings are made to enhance the enjoyment or utility of the coated device. But the environment of use for the device may contain attacking agents, such as oxygen, ozone, sulfur, or nitrogen acid anhydrides. Occasional gasoline or oil spills may damage a car's body. Golf clubs, telephones, and computer keyboards are all exposed to salts and oils from fingers. These insults may constitute no threat to the coating, but they also may be exactly the aggressive agent that turns the hard coating into a sticky goo, thus reducing protection and thereby lifetime.rnThe coating must be designed to protect against such insults to its integrity. Ideally, for most insults, there is a simple way to simulate the chemical attack on the coating film. Some thought about the environment and the chemicals expected in that environment allows us to test the chemical resistance of the most significant threats.