热处理对6061铝合金耐蚀性能的影响
2014-08-12 10:25:52
作者：本站整理来源：
郑传波，唐祝君，李春岭，申小兰
（江苏科技大学，材料科学与工程学院，江苏镇江212003）
（江苏科技大学，材料科学与工程学院，江苏镇江212003）
摘要：本文采用慢应变速率拉伸，极化曲线和阻抗图的方法，结合扫描电子显微镜，从电化学方面研究了不同热处理状态下的6061铝合金在3.5%NaCl溶液中的耐蚀性能。综合数据结果表明：固溶态的合金的拉伸断裂所需时间最长，双级时效态的合金的拉伸断裂所需时间次之，单级时效态的合金的拉伸断裂所需时间最短；固溶态的合金的钝化膜最稳定，阻抗最大，单级时效和双级时效态的合金的钝化膜稳定性较差，阻抗较固溶态的小。双级时效使合金中的第二相粗化，切断了连续的阳极溶解通道，使得自腐蚀电流密度比单级时效态的自腐蚀电流密度小。
关键词：6061铝合金；热处理；慢应变拉伸；极化曲线；阻抗
The effect of heat treatment on corrosion resistance of 6061 aluminum alloy
ZHENG Chuan-bo, TANG Zhu-jun, LI Chun-ling, SHEN Xiao-lan
（Jiangsu University of Science and Technology,Materials Science and Engineering,Zhenjiang 212003,China）
（Jiangsu University of Science and Technology,Materials Science and Engineering,Zhenjiang 212003,China）
Abstract:In this paper, the corrosion resistance in 3.5% NaCl solution of 6061 aluminum alloys after different heat treatment is investigated by slow strain rate equipment, polarization curves and impedance, combining scanning electron microscopy. The results showed that the results of three methods are consistent. The tensile fracture time of the alloy after solution treatment is longest, the one of alloy after dual-stage aging is shorter, and the one of alloy after single-stage aging is shortest; the passivation film of alloy after solution treatment is most stable, with the largest value of impedance, the passivation film of dual-stage aged and single-stage aged alloys are poorly stable, the impedance values are lower. Dual-stage aging makes the second phases coarser, cutting off continuous anodic dissolution channel and owing a smaller current density than single-stage aging alloys.
Key words: 6061 aluminum alloy; heat treatment; slow strain rate; polarization curves; impedance
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