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Intergranular corrosion: the intergrain boundary is a boundary city with disorderly and misaligned intercrystalline grains with different crystallographic orientation. Therefore, they are favorable areas for precipitation of various solute elements in steel or precipitated by metal compounds (such as carbides and delta facies). Therefore, in some corrosive media, it is not surprising that the grain boundaries may be eroded first. This type of corrosion is known as intergranular corrosion. Most metals and alloys may exhibit intergranular corrosion in specific corrosive media.
Crevice corrosion: a form of localized corrosion, which may occur in the crevice of a solution or the surface of a shield. Such gaps can be formed between metal and metal or metal and nonmetal junctions, for example, with rivets, bolts, gaskets, seats, loose surface sediments, and sea living candles.
Total corrosion: a term used to describe corrosion phenomena occurring on the entire alloy surface in a way that is evenly spoonful. When total corrosion occurs, the village materials become thinner due to corrosion, and even the materials fail to corrode. Stainless steel may present full corrosion in strong acids and strong bases. The problem of failure caused by comprehensive corrosion is not very worrying, because the corrosion can usually be predicted by a simple immersion test or a reference to the literature of corrosion.