Abstract
The corrosion performance of Cu-doped Ni–Mo steel has been comprehensively studied in a simulated severe marine environment. Results have indicated that the addition of Cu accelerates the generation of corrosion products and increases the corrosion current density during the initial corrosion process, which can be attributed to the increased proportion of high-angle grain boundaries. Cu improves the long-term protection of a rust layer by forming CuFeO2, and stabilizes substances such as NiFe2O4 and compounds containing Mo4+ and Mo6+. Rust layers optimized by Cu display improved electrochemical properties in 3.5 wt% NaCl solution, indicating the beneficial effect of Cu on their protective properties.
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