EFFECT OF CATHODIC PROTECTION ON FRACTURE BEHAVIOUR OF LOWALLOY STEELS IN SEAWATER
阴极保护对低合金钢在海水中断裂行为的影响

Fracture behaviour of low-all oysteels AISI4340, HY100, WELTEN60, AISIA537 and A131 in artificial seawater under static, cyclic loading and cath-odic protection potential has been investigated by using fracture mechanics, elec-trochemistry and electronfractography. The results reveal that under hydrogen evo-lution potential (cathodic protection potential) the critical yield strength requiredfor the occurrence of SCC decreases from 985 to 872MPa comparing with corrosionpotential (E_c). The effect of cathodic protection on crack propagation of CF is notsimple, it is closely related to the yield strength of steels and their SCC behaviour.For the steels with high yield strength, cathodic protection promotes da/dN