摘要
利用电化学测量技术研究了加载弹性载荷对LY12CZ铝合金在3%NaCl溶液中的自腐蚀电位、点蚀电位和保护电位的影响规律,同时利用小孔发展速率(PPR)—电位曲线法和电位扫描技术及显微测量技术研究了载荷对预选电位下的真实小孔发展速率的影响,根据点蚀电流密度随应力变化情况来研究力学化学作用对LY12CZ点蚀敏感性的影响,结果表明在加载应力时,LY12CZ铝合金的自腐蚀电位、保护电位和破裂电位都有不同程度的负移,负移的量取决于应力的大小。在加载应力时点蚀电流密度随应力增加也出现增大的现象,研究结果表明力学化学效应对LY12CZ铝合金的点蚀行为有显著影响。
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.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2007年第4期228-232,共5页
Journal of Chinese Society For Corrosion and Protection
基金
国家重点基础研究发展规划资助项目(G1999065010)
关键词
点蚀
力学化学效应
应力
小孔发展速率
LY12CZ
pitting corrosion, mechanochemical effect, applied stress, pit propagation rate, LY 12CZ
