【作者】 宋影伟； 韩恩厚； 单大勇； Chang Dong Yim； Bong Sun You；

【Author】 Song Yingwei1,Han En-hou1,Shan Dayong1,Yim Chang Dong2,You Bong Sun2 1 State Key Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences, Shenyang,Liaoning,110016 2 Korea Institute of Materials Science,Changwon 641-831,Korea

【机构】 中国科学院金属研究所金属腐蚀与防护国家重点实验室； Korea Institute of Materials Science；

【摘要】 <正>镁合金腐蚀机理已经开展了大量的研究,其中析出相是影响镁合金耐蚀性最重要的因素。镁合金中的析出相与基体相比较而言化学稳定性高,通常作为微阴极加速腐蚀[1],而宋光铃等人[2,3]的研究发现,AZ91镁合金中的β相对耐蚀性有双重影响,即作为微阴极加速腐蚀或者形成网状分布抑制腐蚀。上述的研究结果都是针对析出相的尺寸较大,至少在微米级的,对于析出相尺寸较小,在纳更多还原

【Abstract】 The MgxZny second phases in Mg-5Zn alloy were adjusted by T4 and T6 treatment,and then the role of second phases in the corrosion behavior of Mg-5Zn alloy was investigated.The dimension of the MgxZny second phases is only some hundred nanometers.They present discrete distribution on the boundaries of the as-received sample and continuous distribution in the T6 sample.The T4 sample in absence of second phases exhibits the best corrosion resistance while the T6 sample with the largest volume fraction of second phases exhibits the worst one,which can be attributed to the micro-cathodic effect of second phases.更多还原