Corrosion resistance includes rust resistance and resistance to acid, alkali, salt and other corrosive media, as well as resistance to oxidation, vulcanization, chlorination, fluorination, etc. at high temperatures. Since the selection of different stainless steels is mainly to solve the problems encountered in actual engineering Various corrosion problems, for this reason, the corrosion resistance of stainless steel wire in a corrosive environment is the first consideration for the material selection personnel.
The selection of stainless steel wire not only needs to consider its general corrosion resistance performance, but also its local corrosion resistance performance. In some water and chemical media, the latter needs to be paid more attention. This is because the material selection personnel generally pay more attention to the stainless steel General corrosion resistance, and under the conditions of use, their sensitivity to local corrosion, such as stress corrosion pitting corrosion, etc., is less considered; the local corrosion of stainless steel wire mostly occurs in a corrosive environment with good general corrosion resistance. , Local corrosion often leads to the sudden destruction of stainless steel equipment and components, which is far more harmful than general corrosion.
When applying the corrosion resistance data of stainless steel wire in various manuals, it should be noted that many of the data are only test results in some experiments, and there are often large discrepancies with the actual medium environment. In order to obtain a corrosion resistance closer to the actual use conditions In general, the corrosion test of the actual medium or the coupon test under the field conditions should be carried out in the laboratory. If necessary, the test of the simulation device should be carried out. Under some conditions of use, this situation will also be encountered. In the medium or in the industrial products produced, even if there are traces of a certain metal ion in the stainless steel wire, it will affect the quality of the industrial products in the chemical process (including gloss, color, purity, etc.). The situation is most common in nuclear fuel pharmaceutical and pigment industries. At this time, stainless steel that does not contain a certain element is often used or the corrosion resistance of the selected stainless steel wire is appropriately increased to reduce the metal ions to the allowable limit.
