Abstract
The study investigated the influence of alternating current (AC) and direct current (DC) on stress corrosion cracking (SCC) behavior of Ti-6Al-3Nb-2Zr-1Mo (Ti80) alloy in simulated marine solution with different pH levels. Electrochemical measurements, slow strain rate tensile (SSRT) tests and fracture morphology analysis were used to evaluate SCC behavior. Under conditions of pH = 2 or 1, AC enhances SCC susceptibility by disrupting the passive film, primarily attributed to anodic dissolution and hydrogen embrittlement. When both AC and DC coexist, the excessively negative potential intensifies the hydrogen evolution reaction, leading to hydrogen embrittlement dominating the SCC mechanism of Ti80.
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