Many customers do not understand why stainless steel special screws will rust, stainless steel special screws are not universal, under special reasons special screws will rust;Screw manufacturers summarize the reasons as follows:
1, stainless steel surface adhesion contains acid, alkali, salt substances (such as decoration wall alkali water, stone ash water splash), causing local corrosion.
2, stainless steel surface adhesion organic juice (such as melon and vegetable, noodle soup, sputum, etc.), in the case of water oxygen, constitute organic acid, organic acid corrosion on the metal surface for a long time.
3, the composition of stainless steel itself nickel and other trace elements are also related.Such as 304 is certainly not as good as 316 rust resistance.304 has better rust resistance than 201.
4, in the polluted air (such as the atmosphere containing a lot of sulfide, carbon oxide, nitrogen oxide), when condensed water, sulfuric acid, nitric acid, acetic acid liquid point, cause chemical corrosion.
5, stainless steel surface is deposited with dust containing other metal elements or other metal particles of the attachment, in the humid air, the attachment and the condensate between the stainless steel, the two together into a micro battery, caused the electrochemical reaction, the protective film is damaged, called electrochemical corrosion
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