Effects of shot peening on the corrosion and stress corrosion cracking (SCC) behaviors of sensitized alloy 600 (UNS N06600) were studied. Electrochemical potentiokinetic reactivation (EPR) tests in 0.01 M sulfuric acid (H 2 SO 4 )+0.001 M potassium thiocyanate (KSCN) solution and immersion tests in boiling 25% nitric acid (HNO 3 ) solution were used to evaluate the effect of heat treatment on the degree of sensitization of alloy 600. Potentiodynamic polarization tests in 0.01 M sodium thiosulfate (Na 2 S 2 O 3 ) solution at 95 °C revealed shot peening increased the anodic current density (CD) of the alloy. However, SCC tests using U-bend specimens indicated shot peening substantially increased the crack initiation time in the same environment. The delayed crack initiation of SCC for shot-peened alloy 600, which is potential dependent, was attributed to the presence of compressive residual stresses and the severely deformed surface microstructure.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Science(all)