中文摘要：

采用电化学方法,在0.1 MNaCl和0.1 MNa2SO4及0.1 MNa2CO3等几种典型介质中研究了AZ91D镁合金的腐蚀行为。极化曲线结果表明：在NaCl和Na2SO4中,阳极极化曲线为活性溶解,在Na2CO3中阳极极化曲线呈现钝化特征。在3种介质中的耐腐蚀性顺序为：NaCl〈Na2SO4〈Na2CO3。EIS结果显示：AZ91D镁合金在几种介质中的电化学阻抗谱均由一个高频容抗弧和一个低频容抗弧组成。形貌观察表明：AZ91D镁合金的腐蚀均只发生在α相,β相不发生腐蚀。在NaCl中腐蚀最为严重,腐蚀的面积较大;在Na2SO4中腐蚀面积较小,在Na2CO3中腐蚀程度最轻,且腐蚀得比较均匀。

英文摘要：

Corrosion behavior of AZ91D magnesium alloy in several typical media including 0.1M NaCl,0.1M Na2SO4 and 0.1M Na2CO3 were investigated by electrochemical methods.Polarization curve tests showed that anodic polarization curves presented in active dissolution characteristic in 0.1M NaCl and 0.1M Na2SO4,while,the anodic branch of polarization curve in 0.1M Na2CO3 presented in passivation characteristic.The order of anti-corrosion performance in the three media was as follows： NaClNa2SO4Na2CO3.EIS measurements illustrated that the Nyquist plots included a high frequency capacitive impedance arc and a low frequency capacitive impedance arc.Morphologies observation indicated that the corrosion on AZ91D magnesium alloy surface only occurred in α phase interior,and β phase did not be corroded.For AZ91D magnesium alloy,the worst corrosion occurred in the NaCl medium,and the area of attack was largest,the district of corrosion was less in Na2SO4 media,and the region of corrosion in Na2CO3 was the mildest and showed in uniform feature.