Reasons of Stainless Steel Rust

Reasons of Stainless Steel Rust

There may be several reasons for the rust of stainless steel materials:

1,Chloride

Chloride are widely present, such as salt / sweat / seawater / sea breeze / soil and so on. Corrosion of       stainless steel  in the presence of chloride ions is fast and even exceeds that of ordinary low carbon steel. Therefore, there are requirements for the use environment of stainless steel, and it is necessary to wipe frequently to remove dust and keep  it clean and dry.

2,Solution treatment

The alloy elements aren’t dissolved in the matrix, resulting in a low alloy content in the matrix structure and poor corrosion resistance.

3,Intergranular corrosion

For applications where welding is required, the lower carbon content minimizes the precipitation of carbides in the heat-affected zone near the weld, and the precipitation of carbides may cause intergranular corrosion of stainless steel  in some environments (welding erosion).

4,Surface marks

The surface mark phenomenon refers to the occurrence of wire-mounting or dot-like dent mark defects on the surface of the product after deep processing of stainless steel or grinding of processed products.

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