The quality of the powder coating for the formation of corrosion processes can be checked in laboratory conditions using special equipment: a salt fog chamber.<\/p>\n
Back in 1914, the metal was first tested in salt fog. And in 1939, the standard for salt spray testing (ASTM B117) was adopted. This procedure suggested a long-term exposure to salt fog samples of 5% concentration at a temperature of 35 \u00b0 C. In the future, this standard become basis for many national and industrial standards (including GOST 9.401-91).<\/p>\n
The test sample of the product is placed in the chamber. There it is exposed to salt fog, temperature and humidity for a certain period of time. Usually 1000 hours.<\/p>\n
This time period is divided into 10 parts. And every 100 hours, the sample is preliminarily pulled out of the chamber and its state is measured, to understand at what stage the process of metal corrosion begins.<\/p>\n
After the test is completed, a control measurement is made, which determines the resistance to corrosion.<\/p>\n
Conditions created in the salt fog chamber imitate the real life where the finished product is subjected to in a short period of time.<\/p>\n
The Lacover technologist Oles Lastivka will give you more details and show the powder coating test process, below.<\/p>\n