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Understand the causes of stress corrosion cracking in alkali solutions (NaOH)

2025-02-13View Original

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Ordinary carbon steel forms a surface film composed mainly of Fe3O4 or Fe2O3 in alkaline solutions; meanwhile, the precipitation of carbides and nitrides at the grain boundaries renders the surface film there unstable, making it prone to dissolution. Under the action of external stress, grain boundary cracks are formed, causing selective dissolution of FeO2- in the newly exposed iron, thereby resulting in stress corrosion.

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