ELECTROCHEMICAL FEATURES DURING PITTING CORROSION OF LY12 ALUMINUM ALLOY IN DIFFERENT NEUTRAL SOLUTIONS
ELECTROCHEMICAL FEATURES DURING PITTING CORROSION OF LY12 ALUMINUM ALLOY IN DIFFERENT NEUTRAL SOLUTIONS
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
Y.L.Cheng;J.F.Li;J.Q.Zhang;C.N.Cao;F.H.Cao;Z.Zhanq
中科院分区：
文献类型：
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作者：
Y.L.Cheng;J.F.Li;J.Q.Zhang;C.N.Cao;F.H.Cao;Z.Zhanq
研究了商用铝合金LY 12在0。采用电化学阻抗谱（EIS）和动电位极化技术研究了349 mol/L中性氯化钠（NaCl）和硫酸钠（Na 2SO 4）溶液的电化学行为。用扫描电子显微镜研究了试样的微观结构。结果表明，LY 12在不同浸泡时间的Nyquist曲线呈现不同的特征，表明Cl-离子提高了腐蚀速率，抑制了亚稳态点蚀的再钝化。LY 12在SO2-4溶液中形成的腐蚀产物不易溶解，在电解液中会覆盖在工作电极表面。SEM照片表明，LY 12在NaCl溶液中的腐蚀表观面积和点蚀坑数均大于在Na 2SO 4溶液中的腐蚀表观面积和点蚀坑数。
The electrochemical features of commercial airframe material, Al alloy LY12, in 0. 349mol/L neutral sodium chloride (NaCl) and sodium sulfate (Na2SO4) solutions were investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The microstructure of the as-tested samples was studied by scanning electron microscopy. The results show that the Nyquist plots of LY12 at different immersion time displayed different fe atures, indicating that the Cl- ions elevate the corrosion rate and inhibit the repassivation of a metastable pit. It also shows that the corrosion product of LY12 formed in SO2-4 solution isn't easy to dissolve, and it will cover the surface of working electrode in the electrolyte. SEM images indicate that the corrosion apparent area and pit number of LY12 in NaCl solution are greater than that in Na2SO4 solution.