Abstract: Metals consist of micrometric size crystalline grainsCrystal Grain . The border between these grains, called grain boundary, is a peculiar and delicate region, due to a distorted crystallographic structure and possible segregation of impurities and second phases. These characteristics of non-equilibrium make grain boundaries particularly reactive, and weaker in terms of corrosion resistanceCorrosion Resistance , so that in some cases a localized corrosionLocalized Corrosion , called intergranular corrosionIntergranular Corrosion , can occur. This corrosionCorrosion -type attack is very severe because it leads to grain detachment, then to a reduced mechanical resistance, despite the negligible metal consumption; in some environments and in the presence of tensile stresses it triggers stress corrosionCorrosion cracking. In this chapter the most common intergranular corrosionIntergranular Corrosion forms are described, including stainless steelStainless Steel sensitizationSensitization (Sensitized Alloy) , knife-line attackKnife-Line Attack , exfoliationExfoliation of aluminium, and selective corrosionSelective Corrosion of brass and cast iron.
Publication Year: 2018
Publication Date: 2018-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 1
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