Effects of mechanochemistry to the pitting behaviour of LY12CZ aluminum alloy

Electrochemical measurement techniques are applied to investigate the effect of applied stress on free corrosion potential, breakdown potential and protection potential of LY12CZ in 3% NaCl.Meanwhile pit propagation rate(PPR)-potential curve technique and potential scanning techniques and micro measurement technique are applied to study the influence of applied stress on the real pit propagation rate of LY12CZ under preselected potential. The results show that when stressed, free corrosion potential, breakdown potential and protection potential of LY12CZ all move negatively,the movement extent depend on the stress.the pitting current density also increase with the increment of stress.The results show that mechanochemical effect can greatly enhance the pitting sensitivity of LY12CZ aluminum alloy.