Abstract
Abstract The effects of stress on corrosion velocity and stress corrosion crack growth rate for the system 18-8 austenitic stainless steel (SS) (sensitized)/Cl− were studied by using linear polarization and slow strain rate techniques in simulated occluded cell solutions of different crack propagation stages with different pH values at 90°C. The stress—elongation curves, crack length—time curves, and corrosion rate—pH curves all showed a critical pH value (≥1.8), which is higher than that found previously (≅1.3) for unstressed specimens. The actual stress corrosion cracking (SCC) velocity was several orders of magnitude higher than the corrosion rates of stressed specimens, indicating that mechanical failure induced by hydrogen embrittlement is the dominating factor for SCC velocity.
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