Salt is one of the most common compounds in the world. Salt can be found in the oceans, atmosphere, land surface, lakes and rivers. Therefore, it is impossible to avoid the exposure of the article to salt spray. The influence of salt spray environment on electricians and electronic products is second only to temperature, vibration, damp heat and dust environment.
Metal corrosion is a process of spontaneous oxidation. In the salt spray environment, the salt mist liquid exists as an electrolyte, which increases the chance of forming a micro-cell inside the metal, accelerates the electrochemical corrosion process, and causes the metal or coating to corrode and rust, thereby causing corrosion of components and solid parts. Destruction and other situations. Therefore, salt spray test on electrical and electronic products is an important method to investigate the corrosion resistance of products.
The salt spray test has three kinds of neutral salt spray test, acetate spray test and copper accelerated acetate spray test. The most widely used is the neutral salt spray test. The neutral salt spray test is mainly used for the inspection of metal materials and metal plating or non-metallic inorganic coating on metal, and also for testing the coating system. In contrast, acetate mist and copper accelerated acetate mist are generally only used for the inspection of metal coatings and not for the inspection of organic coatings.
The purpose of the salt spray test is to evaluate the salt spray corrosion quality of products or metal materials. The determination of salt spray test results is the main evaluation factor for product quality. Whether the judgment result is correct and reasonable is the correct measurement of product or coating resistance. The key to the corrosion performance of salt spray. The results of the test included blistering, rusting, a decrease in adhesion, a spread of corrosion by scratches, and the like. Since the relevant standards for salt spray test evaluation are not popular, the method of determination is also under discussion. In various standard systems, the evaluation of salt spray test results is recommended: GB/T 1766-2008 Rating method for aging of paint and varnish coatings and GB/T 6461-2002 Metal and other inorganic coatings on metal substrates Rating of samples and test pieces after corrosion test.
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