Salt spray testing of zinc alloy die-casting

　　Salt spray testing is often used to test the corrosion resistance of zinc alloy die-casting parts. However, salt spray testing can be divided into two categories: one is natural environmental exposure testing, and the other is a testing method that simulates the salt spray environment through manual acceleration. Currently, there are many applications that simulate salt spray environments through manual acceleration testing.

　　The salt spray test standard is a clear and specific provision for the conditions of the salt spray test, such as temperature, humidity, concentration of sodium chloride solution, and pH value. In addition, it also puts forward technical requirements for the performance of the salt spray test chamber. The corrosion of metal materials by salt spray is mainly caused by the infiltration of conductive salt solutions into the interior of the metal, resulting in electrochemical reactions and the formation of a "low potential metal electrolyte solution high potential impurity" micro battery system, which undergoes electron transfer. The main factors affecting the results of salt spray test include: test temperature and humidity, concentration of salt solution, sample placement angle, pH value of salt solution, salt spray sedimentation and spray mode. The selection of the salt spray test standard for the same product should be based on the characteristics of the salt spray test, the corrosion rate of the metal, and the sensitivity to salt spray.

　　There are many factors that affect the stability and consistency of salt spray test results. To improve the effectiveness of salt spray test results, testing technology is the key. Therefore, testers not only need to have solid professional knowledge and skills, but also rich practical experience and a comprehensive understanding of the product. Understanding salt spray testing from multiple disciplines such as chemistry and environmental engineering, materials, structure, and technology, scientifically and reasonably expressing test results, providing effective information for product material selection, structural design, process selection, product transportation, storage, and annual use, and improving the salt spray corrosion resistance of products or materials.

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