高阻尼层压铝合金复合材料在人造海水中的腐蚀行为
来源期刊：中南大学学报(自然科学版)1995年第2期
论文作者：罗兵辉 周善初
文章页码：213 - 217
关键词：层压板; 点蚀; 均匀腐蚀; 缝隙腐蚀
Key words：laminated boards; pitting corrosion; uniform corrosion; crevice corrosion
摘 要：高阻尼层压铝合金板材外层为高阻尼但耐蚀极差的Zn－22%Al(质量分数)共析合金。为了使其成为耐海水腐蚀的设施材料,选择高纯铝(99.99%)、4号防锈铝LF4(5083)和包覆铝LB1(7072)作为层压板两外层的保护层,通过在人造海水中浸泡实验、电化学行为分析及溶解形貌的电镜观察等,研究了不同保护层材料和基体材料的电化学特征,比较分析得出,在常温人造海水中,以高纯铝或LF4作保护层的层压板,由于保护层点蚀严重,加速了层压板的缝隙腐蚀,导致层压析易破坏;以LB1作保护层的层压板,因为LB1电位低不发生钝化和点蚀而主动溶解,层压板表面腐蚀均匀,极化性能也好,适合于作为耐海洋性气候腐蚀的高阻尼层压析的保护材料。
Abstract: The two outer layers of laminate with high damping and the multiple properties of mechanics are of superplastic Zn-22%Al eutectoid alloy with bad corrosion behaviour.In order to study cathodic protection technology for laminate structures in an artificial seawater,three kinds of outer protection materials are chosen,i.e.(a)high purity aluminum(99.99%),(b)5083(LF4),and(c)7072(LB1).The performance of laminate protected with pureAl or 5083 suffered pitting and then crevice corrosion appeared.Pitting was prevented byprotection of 7072.The improved performance characteristics in the seawater for the laminate were obtained,which resulted from the decrease in anode potential with a consequentactive dissolution without passivation and pitting.
