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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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交变电场脉冲钝化Fe24Mn4Al5Cr反铁磁定膨胀合金及其耐蚀性研究
DOI: 10.3724/SP.J.1037.2012.00201, PP. 1357-1364
Keywords: Fe-Mn-Al合金,脉冲钝化,钝化膜,电位衰减,阳极极化,电化学交流阻抗
Abstract:
采用交变电场脉冲钝化技术表面改性Fe24Mn4Al5Cr反铁磁定膨胀合金.在1.0mol/LNa2SO4溶液中通过脉冲钝化生长钝化膜,再在1.0mol/LNa2SO4+0.5mol/LNa2SO4溶液中测定电位衰减曲线,以优化脉冲钝化工艺参数.利用AES和XPS分析优化工艺条件下生长的脉冲钝化膜化学组成、键合状态及其深度分布;利用阳极极化曲线和电化学阻抗谱测试脉冲钝化膜耐腐蚀性能,并与直流620mV连续钝化15min生长钝化膜相比较.研究发现,脉冲钝化膜中元素Al和Cr富集,元素Mn贫化,具有保护性的Al2O3和Cr2O3氧化物阻碍层增厚.脉冲钝化膜的阳极极化曲线呈自钝化,自腐蚀电位Ecorr由连续钝化膜的-360mV增至-100mV,维钝电流密度emp由2.6μA/cm2降至0.7μA/cm2,阳极极化性能与AISI304不锈钢相当.脉冲钝化膜的EIS与连续钝化膜相比,其容抗弧直径及|Z|值增加,相位角平台变宽,利用等效电路Rs-(Rp//CPE)拟合的脉冲钝化膜电阻Rp由连续钝化膜的14.8kΩ·cm2增至54.0kΩ·cm2,计算的有效电容CB则由14.0μF/cm2降至10.2μF/cm2.Fe24Mn4Al5Cr反铁磁定膨胀合金脉冲钝化膜的绝缘性提高,耐蚀性改善.
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