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Salt spray test is an environmental test that mainly uses artificial simulated salt spray environmental conditions created by salt spray testing equipment to evaluate the corrosion resistance of products or metal materials.
According to the application instructions of the salt spray ( ) test according to the US military specifications, the salt spray test is usually evaluated on the test piece. This test cannot replace the effects of humidity and mold growth, and is usually not used to evaluate the test piece of the entire system. The salt spray test is usually carried out after the climate test and has a more obvious effect on the discovery rate of coating defects
As far as the test conditions are concerned, except for the slight difference in the purity of the salt used, the test temperature and the salt spray specific gravity are almost the same. It is exactly the same. According to practical experience, it is easier to observe the defects of the coating and verify the quality of the coating by using the humidity and salt spray interactive cycle test method than the fixed temperature and salt spray test method.
Laboratory simulated salt spray tests can be divided into four categories: neutral salt spray test, acetate salt spray test, copper salt accelerated acetate salt spray test, alternating salt spray test. The neutral salt spray test that iST can currently performbr/>The neutral salt spray test (test) is the earliest accelerated corrosion test method that has the widest application fields. It uses sodium chloride salt water solution, and the solution value is adjusted to the neutral range (~) as the solution for spraying. The test temperature is all taken as ℃, and the sedimentation rate of salt spray is required to be between.
The acetate salt spray test (test) was developed on the basis of the neutral salt spray test. It is to add some glacial acetic acid to the sodium chloride solution to reduce the value of the solution to about 100%, the solution becomes acidic, and the final salt spray formed also changes from neutral salt spray to acidic. Its corrosion rate is about three times faster than the test.
The copper salt accelerated acetate salt spray test (test) is a rapid salt spray corrosion test recently developed abroad. The test temperature is ℃, and a small amount of copper salt copper chloride is added to the salt solution to strongly induce corrosion. Its corrosion rate is approximately three times that of the test.
The alternating salt spray test is a comprehensive salt spray test. It is actually a neutral salt spray test plus a constant humidity and heat test. It is mainly used for cavity-type complete machine products. Through the penetration of the moist environment, salt spray corrosion occurs not only on the surface of the product, but also inside the product. It alternately converts the product under two environmental conditions: salt spray and humid heat, and finally assesses whether there are any changes in the electrical and mechanical properties of the complete product.
The salt spray test is usually judged by visual inspection before and after the test or using a low-magnification optical microscope to judge the lighter the degree of rust, the stronger the corrosion resistance of the product. During the test, temperature, salt spray concentration, humidity/salt spray cycle and test time will be used as severity levels.
Carry out the salt spray test according to the salt spray test of the second part of the environmental test for electrical and electronic products.
This standard specifies the salt spray test method for basic environmental testing of electrical and electronic products.
This standard is suitable for assessing the salt spray corrosion resistance of materials and their protective layers, as well as comparing the process quality of similar protective layers. It can also be used to assess the salt spray corrosion resistance of certain products.
This standard is not applicable as a general corrosion test method.
Scope of application: To assess the salt spray corrosion resistance of materials and their protective layers, and to compare the process quality of similar protective layers. It can also be used to assess the salt spray corrosion resistance of certain products.
This standard is not applicable as a general corrosion test method.
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