The environmentally-assisted cracking (EAC) behavior of Alloy 182 weld in 0.05 M hydrochloric acid solution was investigated by employing slow strain rate testing (SSRT) technique. The potentials applied during SSRT at a strain rate of 8.3 x 10-7 s-1 were controlled at cathodic, active-to-passive transition, passive and transpassive potential regions, respectively. The experimental results showed that Alloy 182 weld was most susceptible to cracking in 0.05 M hydrochloric acid solution under cathodic polarization condition. In the active-to-passive transition as well as in the transpassive potential regions, the weld also suffered EAC. However, in the passive potential region, the weld was immune to EAC. The strain-rate-dependent EAC behavior was observed in 0.05 M hydrochloric acid solution at an applied potential of -50 mVSCE (in the active-to-passive transition region). The results indicated that hydrogen-assisted cracking (HAC) participated in the cracking process under anodic polarization condition.

Subject
Scanning electron microscopy, Environmental cracking, Transpassivation, Strain rate, Cathodic potential, Circuit potentials, Fracture surfaces, Micrography, Stress cracking, Electric potential, Alloys, Electrochemical potential, Stress corrosion cracking
Keywords:
Alloy 182, weld, slow strain rate test (SSRT), environmentally-assisted cracking (EAC), hydrogen-assisted cracking (HAC)
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2009
Association for Materials Protection and Performance (AMPP)
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