Pitting corrosion of stainless steel: Pitting corrosion refers to the localized corrosion that most of the metal material does not corrode or corrodes slightly and is scattered and highly dispersed. The size of common pits is less than 1.00mm, and the depth is often greater than the surface pore size. The lighter ones have shallower pits, and even the formation of perforation.
Intergranular corrosion of stainless steel: The grain boundaries are the boundaries of disordered misalignment between grains with different crystallographic orientations. Therefore, they are the segregation of various solute elements in the steel or the precipitation of metal compounds (such as carbides and delta phases). favorable area. Therefore, in some corrosive media, it is not surprising that grain boundaries may be eroded first. This type of corrosion is called intergranular corrosion, and most metals and alloys may exhibit intergranular corrosion in certain corrosive media. Intergranular corrosion is a kind of selective corrosion damage, which is different from general selective corrosion in that the locality of corrosion is microscopic, but not necessarily macroscopic.
Stainless steel crevice corrosion: refers to the occurrence of speckled or ulcerated macro pits at the crevices of metal components, which is a form of localized corrosion, which may occur in the crevices where the solution is stagnant or in the shielded surface. Such gaps can form at metal-to-metal or metal-to-non-metal joints, for example, in contact with rivets, bolts, gaskets, valve seats, loose surface deposits, and marine life.
