Classification methods for metal corrosion

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Due to the diversity of corrosion and the wide range of fields involved, there are various classification methods. The most common way of classification is based on the following different perspectives: 1. Classification by corrosion mechanism ① Chemical corrosion: Chemical corrosion refers to the degradation that occurs as a result of a pure chemical reaction between the metal surface and a non-electrolyte. ②Electrochemical corrosion refers to the degradation that occurs as a result of electrochemical reactions between a metal surface and an ion-conducting medium (electrolyte). ③Physical corrosion refers to the damage to metals caused by simple physical dissolution. 2. Classification by corrosion pattern: ① General corrosion: uniform corrosion, non-uniform corrosion. ② Local corrosion: a. Pitting corrosion b. Crevice corrosion c. Galvanic corrosion d. Intergranular corrosion. ③ Corrosion under stress: a. Stress corrosion cracking (SCC) b. Hydrogen embrittlement and hydrogen-induced cracking (HE, HIC) c. Corrosion fatigue d. Wear corrosion