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Causes of stainless steel special screw rusting

2021-05-31

Stainless steel special screw why also can rust, stainless steel is not omnipotent, also can rust in special reason

1: Stainless steel surface adhesion contains acid, alkali, salt substances (such as decoration wall of alkali water, lime water splash), causing local corrosion.

2: In the polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide and nitrogen oxide), when it meets with condensate water, it forms sulfuric acid, nitric acid and acetic acid, causing chemical corrosion.

3: There are dust containing other metal elements or attachments of dissimilar metal particles on the surface of stainless steel. In humid air, the condensation water between the attachments and stainless steel connects them into a micro battery, causing electrochemical reaction and damaging the protective film, which is called electrochemical corrosion.

4: In the presence of water and oxygen, organic acids (such as melon, vegetable, noodle soup, phlegm, etc.) adhere to the surface of stainless steel, which will corrode the metal surface for a long time.

5: There is also the composition of stainless steel itself, nickel and other trace elements are also related. For example, 304 is certainly not as good as 316. The antirust property of 304 is better than that of 201.

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