通过对模拟海洋大气加速腐蚀试验和外场暴露试验中的LY12铝合金初期腐蚀形貌、电位和交流阻抗等的测量和分析,研究铝合金在海洋大气环境下的初期腐蚀行为,并考察加速腐蚀试验结果和外场暴露试验结果的相关性.结果表明:铝合金初期腐蚀表面属于吸附型阻抗类型,电位有轻微上升,腐蚀伴随着表面氧化层的开裂.外场暴露腐蚀表面自然氧化层明显龟裂,加速腐蚀表面氧化层开裂不明显.模拟海洋大气加速腐蚀试验和外场暴露试验在腐蚀形貌、电位、交流阻抗等方面具有较好的相关性.

With measuring and analyzing corrosion morphology,potential and EIS,the initial corrosion of aluminum alloys in marine atmosphere and correlation of simulated marine atmosphere accelerated corrosion test and outfield corrosion test were studied.The EIS of aluminum initial corrosion surface belonged to adsorbent impendence type.Initial corrosion was accompanied with slight potential rising and oxide layer corrupting,which was more obvious in outfield test than in accelerated test.There was good correlation in corrosion morphology,potential and EIS for outfield and accelerated test results.