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Wow! Why stainless steel will rust it?

  • Author:Angelia
  • Source:www.diecastingpartsupplier.com
  • Release on:2017-06-21
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Stainless steel material rust phenomenon, there may be the following reasons:

There is chloride ion in the folding environment

Chloride is widely present, such as salt / perspiration / sea water / sea breeze / soil and so on. Stainless steel in the presence of chloride ions in the environment, corrosion quickly, even more than ordinary low carbon steel. So the use of stainless steel environment requirements, and need to always wipe, remove the dust, keep clean and dry. (So that you can give him a "improper use.") The United States has an example: an enterprise with an oak container containing a chloride ion solution, the container has been used for nearly a hundred years, the last century, , Due to the oak material is not modern enough, the use of stainless steel after 16 days of replacement containers due to corrosion leakage.

The folds are not subjected to solution treatment

Alloying elements are not dissolved in the matrix, resulting in low matrix alloy composition, poor corrosion resistance. mold maker manufacturing china

Fold the innate intergranular corrosion

This kind of titanium and niobium-free materials tend to have intergranular corrosion. Adding titanium and niobium, coupled with a stable treatment, can reduce intergranular corrosion. In the air or chemical corrosion medium can resist corrosion of a high alloy steel, stainless steel is a beautiful surface and good corrosion resistance, without going through the surface treatment such as color, and play the inherent surface properties of stainless steel, used in more A kind of steel, usually called stainless steel. On behalf of the performance of 13 chrome steel, 18-8 chrome nickel steel and other high alloy steel. From the perspective of metallography, because the stainless steel contains chromium and the surface to form a very thin chromium film, the membrane separated from the steel intrusion of oxygen from the role of corrosion resistance. In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 12% of the chromium. For occasions where welding is required. The lower carbon content minimizes the amount of carbides that are precipitated in the heat affected zone near the weld, and the precipitation of carbides may cause intergranular corrosion (weld erosion) in certain environments.

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