Introduction to the basic procedures for corrosion failure analysis

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Corrosion failure analysis is primarily aimed at understanding the causes of corrosion, identifying the type of corrosion, and preventing or reducing corrosion occurrences； Corrosion failure: Corrosion refers to the damage that occurs on the surface of metal or alloy materials as a result of chemical or electrochemical reactions. Metal corrosion, although it serves useful purposes in areas such as pickling, chemical power sources, electrolytic processing, and metallographic etching, causes considerable losses to the national economy. Corrosion failure is the phenomenon in which mechanical components lose their original designed functions due to corrosion. The types of corrosion failure include: direct chemical corrosion failure ； Electrochemical corrosion failure ； pitting corrosion failure ； Local corrosion failure ； Grain boundary corrosion failure ； Selective corrosion failure ； Crevice corrosion failure ； Biological corrosion failure ； Wear-corrosion failure ； Hydrogen damage failure ； Stress corrosion failure, etc. Basic procedures for corrosion failure analysis: 1) Investigation of information at the failure site (including collection of background materials) 2) Preliminary study of the failure incident 3) Preliminary identification of the failure mode 4) Determination of specific analysis approaches and procedures 5) Execution of the procedures to identify the cause of failure 6) Comprehensive analysis of the cause of failure