化学转化处理时间对新型2198铝锂合金耐蚀性的影响
Effect of Chemical Conversion time on Corrosion Resistance of a New Aluminum-Lithium Alloy 2198
摘 要
采用Alodine1500铬酸盐对新型2198铝锂合金进行了不同时间的化学转化处理。通过极化曲线、电化学阻抗谱及腐蚀形貌，研究了化学转化处理时间对铝锂合金在3.5%（质量分数） NaCl溶液中耐蚀性的影响。结果表明：经过化学转化处理后，该铝锂合金的耐蚀性得到提高，化学转化处理时间为5 min时，铝锂合金的耐蚀性最好；随化学转化处理时间的延长，化学转化膜厚度增加，铝锂合金的点蚀程度降低，但时间过长，化学转化膜会变得疏松多孔，耐蚀性反而降低。
电化学阻抗谱
极化曲线
化学转化膜
aluminum-lithium (Al-Li) alloy
electrochemical impedance spectroscopy (EIS)
polarization curve
conversion coating
Abstract
A new aluminium-lithium alloy 2198 was treated by chemical conversion using Alodine1500 chromate for different periods of time. The effect of chemical conversion time on corrosion resistance of the aluminium-lithium alloy was studied through polarization curves, electrochemical impedance spectroscopy and corrosion morphology in 3.5% (mass fraction) NaCl solution. The results show that after chemical conversion the corrosion resistance of the aluminum-lithium alloy was improved. The aluminum-lithium alloy had the best corrosion resistance,when the chemical conversion time was 5 min. With the prolongation of chemical conversion time, the chemical conversion coating increased in thickness, making the pitting degree of aluminum-lithium alloy decline. However, if the chemical conversion time was over long, the chemical conversion coating became loose and porous, and the corrosion resistance decreased instead.
中图分类号 TG172 DOI 10.11973/fsyfh-202012005
所属栏目 试验研究
基金项目
收稿日期 2019/1/29
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引用该论文: YI Junlan,QIN Rui,WU Hongliang,CEN Shuai,WU Songlin,SONG Yuanzeng,CHEN Jie. Effect of Chemical Conversion time on Corrosion Resistance of a New Aluminum-Lithium Alloy 2198[J]. Corrosion & Protection, 2020, 41(12): 26
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