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通过盐雾实验模拟沿海大气环境,研究了6082-T6铝合金的腐蚀行为及机理。结果表明:6082-T6铝合金的腐蚀失重与腐蚀时间的关系可用幂指数函数表示:D=0.44t0.45;腐蚀实验初期,Cl-促使铝合金发生点蚀,随后点蚀产物逐渐汇聚堆叠,进入全面腐蚀阶段;随着腐蚀时间延长,腐蚀产物层的孔隙减少且厚度不断增加;当腐蚀实验时间在20~30 d之间,外层腐蚀产物的侵蚀溶解占主导地位,使其厚度减小且变为疏松的棱状堆叠;进一步延长腐蚀时间,表面的腐蚀产物转变为致密堆叠的层片状。电化学测试分析表明,随着腐蚀时间的延长,6082-T6铝合金腐蚀电流密度Icorr呈现先增大,后减小,再增大,最后下降的趋势;容抗弧半径呈现先降低,后升高,再下降,最后回升的趋势。
The corrosion behavior and mechanism of 6082-T6 aluminum alloy were studied by simulating the coastal atmospheric environment by salt spray experiment. The results show that the relationship between corrosion weight loss and corrosion time of 6082-T6 aluminum alloy can be expressed by exponential function: D = 0.44t0.45. At the initial stage of corrosion experiment, Cl- promotes pitting corrosion of aluminum alloy, then the pitting products gradually converge on the stack, Enter the full corrosion stage; with the extension of the corrosion time, the pores of the corrosion product layer decrease and the thickness increases continuously; when the corrosion test time is between 20 and 30 days, the erosion and dissolution of the outer corrosion products dominate and the thickness decreases And become a loose prismatic stack; to further extend the etching time, the surface of the corrosion products into dense stacked lamellae. The results of electrochemical tests showed that the corrosion current density Icorr of 6082-T6 aluminum alloy firstly increased, then decreased, then increased, and finally decreased with the increase of corrosion time; the arc radius of capacitive arc first decreased and then rose High, then decline, the final recovery trend.