Mn元素对AP65阳极组织和性能的影响

Influence of Mn element on the microstructure and properties of AP65 anode materials

采用熔炼铸造法制备AP65合金阳极材料,采用恒电流扫描法、动电位极化扫描法和浸泡法研究Mn含量对其在3.5%NaCl中的电化学性能和自腐蚀性能的影响,采用光学显微镜、扫描电镜和X射线衍射仪对其显微组织和腐蚀形貌进行观察和检测。结果表明Mn元素的加入,能粗化AP65阳极的铸态组织,使AP65阳极的腐蚀电位正移,腐蚀电流密度减小,耐蚀性能得到显著提高;使AP65阳极平均电极电位负移,当Mn含量为0.3%时,AP65阳极平均电极电位最负,达到-1.528VSCE。

AP65 anode materials were prepared by melting and casting.The influence of Mn content on the electrochemical and self-corrosion behavior of AP65 anode materials were investigated by galvanostatic tests,potentiodynamic plorization and immersion tests in 3.5% NaCl.The microstructure of the experimental specimens and the corroded surface after galvanostatic test were observed by OM,SEM and XRD.The results show that the grain size are coarsened when Mn added.Mn addtion can make corrosion potential shif positivly,corrosion current density decrease,show a good corrosion resistance,and make the average of discharge electrode potential shift negativly.When Mn content is 0.3%,the anode has the most negative mean electrode potential,which up to-1.528VSCE.