Stainless steel

Corrosion-resistant stainless steel is able but due to its surface to form a layer of protective passive film. However, once this layer of passive film is destroyed, but the lack of self-passivating condition or capability, stainless steel corrosion occurs if the corrosion is only concentrated at certain points of the domain of stainless steel, and is formed at these points to the deep domain at corrosion pits development, and most of the surface of stainless steel remains passive corrosion phenomenon, known as pitting.

Stainless steel only in certain corrosive media pitting corrosion can occur. When the media halogen ion and an oxidizing agent exist, it is easy to prone pitting. Most of pitting corrosion of stainless steel equipment failure is caused by chlorine and chloride ions, particularly hypochlorite, the more corrosive. Other halogen ions, bromide will also cause pitting, and fluoride and iodide solution, pitting a small stainless steel tends to occur. If it contains copper, iron and other metal ions in the mercury chloride solution is particularly serious corrosion, pitting corrosion occurs devices risk will be greater.

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