Abstract : The effect of salt spray test technique on the test results is analyzed. The factors that influence the salt spray corrosion mechanism and the salt spray corrosion include the test temperature and humidity, the concentration of the salt solution, the sample placement angle, the pH value of the salt solution, and the salt spray settlement amount. The effectiveness of the salt spray test results has been discussed in terms of spray patterns and test results.
Keywords: salt spray, test technology, effectiveness, 40mm pop up waste
Salt spray corrosion will damage the metal 40mm pop up waste protective layer, causing it to lose its decorative properties and reduce its mechanical strength; some electronic components and electrical circuits, due to corrosion, cause power line interruptions, especially in a vibrating environment, especially when salt spray occurs. When landing on the surface of the insulator, the surface resistance will be reduced; after the insulator absorbs the salt solution, its volume resistance will be reduced by four orders of magnitude; the moving parts of the mechanical parts or moving parts will increase the friction due to the generation of corrosive substances and cause movement. Parts are stuck.
The corrosion of metal materials 40mm pop up waste by salt fog is mainly caused by the electrochemical reaction of conductive salt solution permeating into the metal to form a “low-potential metal-electrolyte solution-high potential impurity” microbattery system, where electron transfer occurs and the metal 40mm pop up waste as the anode dissolves. New compounds are formed as corrosion 40mm pop up waste. The protective metal 40mm pop up waste layer and the organic material protective layer are also the same. When the salt solution as an electrolyte penetrates inside, a micro-battery with a metal as an electrode and a metal 40mm pop up waste protective layer or an organic material as another electrode is formed.
Chloride ions play a major role in the salt fog corrosion damage process. It has a strong penetrating power, easily penetrates the metal oxide layer into the metal 40mm pop up waste, and destroys the passive state of the metal 40mm pop up waste. At the same time, chloride ions have very little hydration energy and are easily adsorbed on the surface of the metal 40mm pop up waste, replacing the oxygen in the oxide layer of the protective metal and damaging the metal 40mm pop up waste.
In addition to chloride ions, salt spray corrosion mechanisms are also affected by oxygen dissolved in the salt solution (substantially the salt solution that dissolves on the surface of the sample 40mm pop up waste). Oxygen can cause the depolarization process of the metal 40mm pop up waste surface and accelerate the dissolution of the anode metal. Since the salt spray process continues to spray, the salt liquid film continuously settles on the surface of the 40mm pop up waste sample, so that the oxygen content is always kept near saturation. The formation of corrosion products expands the volume of the salt solution that penetrates into the metal defect, thereby increasing the internal stress of the metal, causing stress corrosion, and causing the protective layer to swell.