The effect of corrosion evolution on the stress corrosion cracking behavior of mooring chain steel

The effect of corrosion evolution on the stress corrosion cracking (SCC) of mooring chain steel is investigated by adjusting the corrosion evolution degree in a temperature acceleration environment. The corrosion evolution is the transformation of pitting into uniform corrosion in simulated seawater, which affects the initiation site of microcracks and the roles of corrosion and hydrogen during SCC. When corrosion form is pitting at 25 °C, microcracks initiate at pits and hydrogen plays an important role. When corrosion form is uniform corrosion at 55 °C, Cr-rich carbides cause microcracks initiation along grain boundaries and anodic dissolution plays the dominant role.