Bridging static corrosion behavior and stress corrosion cracking susceptibility in dilute Mg-Zn-Ca alloys

The relationship between corrosion behavior and stress corrosion cracking (SCC) is bridged in ZX10-xSn (0 ≤ x ≤ 2) alloys. Specifically, severe localized corrosion serves as a crack initiation source and causes film rupture and hydrogen accumulation, resulting in high susceptibility index of SCC ( I SCC ). Among the five alloys, ZX10–1.5Sn boasts the lowest I SCC , with an I εf of ∼2 % for pre-immersed samples and ∼63 % for immersed samples, owning to its uniform corrosion . This significant difference in I εf suggests that enhanced hydrogen penetration due to external forces, rather than the corrosion products , plays a more critical role in deteriorating mechanical properties. • A correlation between corrosion and stress corrosion cracking (SCC) has been bridged. • The corrosion uniformity rather than its rate plays a pivotal role in determining SCC. • Localized corrosion acts as sites for crack nucleation and propagation, worsening SCC. • External force-driven hydrogen penetration during corrosion process exacerbates SCC.