摘要
用测量阳极极化曲线与相应电化学参数方法研究Ａｌ与Ｃｒ含量对Ｆｅ－２５Ｍｎ合金在 １ ｍｏｌ／ＬＮａ２ＳＯ４溶液中电化学极化行为的影响．在１ ｍｏｌ／ＬＮａ２ＳＯ４溶液中，Ｆｅ－２５Ｍｎ合 金不能钝化．在Ｆｅ－２５Ｍｎ合金中加入２．２％Ａｌ导致呈现一个广阔的活化－钝化转变区， 并在高电位处显示钝化的趋势．进一步在Ｆｅ－２５Ｍｎ－２．２Ａｌ合金中加入６．９％Ｃｒ则引致钝化 能力显著增加，并呈现窄的活化－钝化转变区及一个颇稳定的钝化区．Ｆｅ－２５Ｍｎ－２．２Ａｌ－ ６．９Ｃｒ合金的维钝电流密度Ｉｐ接近１Ｃｒ１３不锈钢的Ｉｐ值．还对加入Ａｌ或Ｃｒ和Ａｌ与Ｃｒ的 优化组合提高Ｆｅ－Ｍｎ基合金钝化性能的原因进行了简单的讨论．
The effect of Al and Cr content on electrochemical polarization behaviour of Fe-25Mn alloy in 1 mol/L Na2SO4 aqueous solution has been investigated by electrochemical polarization measurements. The binary Fe-25wt%Mn alloy can not be passivate in 1 mol/L Na2SO4 solution. An addition of 2.2wt%Al to Fe-25Mn alloy results in a quite broad active-passive transition region and the tendency toward passivation at high positive potential. Further addition of 6.9%wt%Cr to Fe-25Mn-2.2Al alloy leads to an obvious improvement of passive ability and presenting a narrow active-passive transition as well as a stable passivation region. The passive current density Ip of Fe-25Mn-2.2Al-6.gCr alloy is in the same order of ICr13 stainless steel. The reason for the beneficial effect of Al or Cr content and appropriate combination of Al and Cr on the passive ability of Fe-Mn base alloy has been discussed briefly.
出处
《大连铁道学院学报》
2001年第4期54-58,共5页
Journal of Dalian Railway Institute
基金
国家自然科学基金项目(59901003
59471027)
辽宁省教育厅高等学校科学研究项目(20131037)
