09304 Effects of Potential and Strain Rate on the Cracking Behavior of Alloy 182 Weld in Hydrochloric Acid Solution

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Product Number: 51300-09304-SG

ISBN: 09304 2009 CP

Author: Wen-Ta Tsai and Chien-I Huang

Publication Date: 2009

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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.

Keywords: Alloy 182, weld, slow strain rate test (SSRT), environmentally-assisted cracking (EAC), hydrogen-assisted cracking (HAC)