Corrosion of austenitic stainless steel by Cl-.
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Cl- is highly corrosive to austenitic stainless steel; therefore, is it possible for Cl- to cause severe general corrosion in austenitic stainless steel without inducing pitting?
Yes, the corrosion of austenitic stainless steel by Cl- can manifest as general corrosion without pitting. This type of corrosion generally occurs in environments with high concentrations of Cl-, such as seawater. In such an environment, Cl- forms a layer of corrosion products on the surface of austenitic stainless steel, a phenomenon known as \"intergranular corrosion\", which causes the material to lose its corrosion resistance and ultimately leads to overall corrosion. .
If the concentration and temperature do not meet the required levels, it becomes difficult for stress corrosion cracking to occur and cracks to form; instead, it shifts to severe general corrosion. https://attach01.hcbbs.com/forum/201304/11/082917llfdqpokwxuzfdg1.png?x-oss-process=style/ossprn
Yes, stress corrosion cracking requires the fulfillment of various conditions, including the presence of sufficient chloride ions in the medium along with high stress; factors such as temperature and pH value also influence the occurrence of stress corrosion cracking. If these conditions are not met, stress corrosion cracking is unlikely to occur, and it will instead turn into severe general corrosion. It should be noted, however, that even general corrosion can lead to component failure; therefore, appropriate anti-corrosion measures are still necessary to protect metal materials. .
Boss, is the corrosion pattern of CL- on stainless steel based primarily on microscopic intergranular corrosion? Are local forms of corrosion such as stress corrosion cracking and pitting, as well as severe general corrosion, caused by the degree of intergranular corrosion present?