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types and definitions of corrosion
In many industrial applications, stainless steel can provide satisfactory corrosion resistance. According to the experience used, in addition to mechanical failure, the corrosion of stainless steel is mainly manifested in: a serious corrosion form of stainless steel is local corrosion (i.e., stress corrosion cracking, point corrosion, intergranular corrosion, corrosion fatigue and gap corrosion). The failure cases caused by these localized corrosion accounts for more than half of the failure cases. In fact, many failure accidents can be avoided through reasonable material selection.
Stress corrosion cracking (SCC): a general term for failure of alloys subjected to stress due to the expansion of stripe in corrosive environments. Stress corrosion cracking has brittle fracture morphology, but it may also occur in materials with high toughness. The necessary condition for the occurrence of stress corrosion cracking is the existence of tensile stress (whether it is residual stress or external stress, or both) and specific corrosion medium. The formation and expansion of the pattern are approximately perpendicular to the tensile stress direction. The stress value that causes stress corrosion cracking is much smaller than the stress value required for material fracture when there is no corrosive medium. In microcosmic, the crack that passes through the grain is called the transgranular crack, and the crack along the grain boundary is called the intergranular crack. When the stress corrosion cracking expands to its depth (where the stress on the section of the material under the load reaches its fracture stress in the air), the material is under the normal crack (in the ductile material, It is usually broken through polymerization of microscopic defects. Therefore, the section of a part whose failure is due to the stress corrosion cracking will include the characteristic area of the stress corrosion cracking and the "dimple" area associated with the polymerization of the slightly defective.