People always thought that stainless steel won’t and shouldn’t get rusty. If it gets rusty, it must be fake or shoddy product. Is that true?
Actually “stainless” in stainless steel doesn’t mean never get rusty, it only works in under a certain condition. If we use stainless steel products under the condition out of their anti-corrosion capability, they will absolutely rust.
What’s the factors that may lead to the rust?
A. Corrosion by chloridion. Chloridion exists everywhere in nature: in salt, sweat, seawater, soil, etc. It is difficult to avoid. Although stainless steel has good corrosion resistance, it’s anticorrosion will be weakened under high chloridion circumstances.
B. Lack of solid solution treatment. There are some other metallic elements such as nickel, manganese, chromium, etc in stainless steel besides carbon. These metallic elements will strengthen performance of stainless steel. Meanwhile, if there is no solid solution treatment, the matrix alloy content is low, corrosion resistance is poor, so it will be corroded by the corrosion factors among the environment.
C. Intergranular corrosion. Materials that do not contain titanium and niobium tend to have intergranular corrosion. Majority of China's stainless steel is not added titanium and niobium at present. Although the surface of stainless steel is not likely to be corroded, its internal began to corrosion. At the same time some of the acts in the process will also accelerate the intergranular corrosion, such as welding.
As long as these factors are well handled, rusting can be reduced.
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