腐蚀产物对纯Al 8A06长期大气腐蚀行为影响的研究  

Effect of Corrosion Products on Long-term Atmospheric Corrosion of Pure Aluminum 8A06

作　　者：孙霜青 郑弃非[2] 李春玲 王秀民 胡松青 

机构地区：[1]中国石油大学(华东)理学院,青岛266580 [2]北京有色金属研究总院国家有色金属复合材料工程技术研究中心,北京100088

出　　处：《中国腐蚀与防护学报》2017年第2期110-116,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51201183和51501226);中央高校基本科研业务费专项资金(14CX02221A和17CX05023);青岛市自主创新计划应用基础研究(16-5-1-90-jch和15-9-1-46-jch)~~

摘　　要：在海洋和工业大气环境中对纯Al 8A06进行为期20 a的现场暴露实验,利用电子探针(EMPA)、波谱仪(WDS)和电化学阻抗(EIS)对腐蚀产物的形貌、元素组成和极化电阻Rp进行了分析和测试。结果表明,在两种大气环境中纯Al 8A06的腐蚀产物均主要由Al,O和S组成,但其腐蚀速率在工业大气环境下的约为海洋大气环境的1.5倍。在0.6 mol/L Na_2SO_4溶液中,极化电阻Rp从大到小顺序为:海洋大气环境中暴露20 a的试样>工业大气环境中暴露20 a的试样>8A06基体,这说明在海洋大气环境中腐蚀产物对基体的保护作用比工业大气环境中更好。Atmospheric corrosion products of pure aluminum alloy 8A06 exposed for 20 a in coastal- and industrial-atmosphere respectively was investigated by electron probe microanalysis （EPMA）, wave- length-dispersive X-ray spectroscopy （WDS） and electrochemical impedance spectroscopy （EIS）. Re- sults show that the corrosion rate of the specimen exposed in industrial atmosphere is approximately 1.5 times higher than that exposed in coastal atmosphere, though the corrosion products in both atmospheres all mainly contained elements O, AI and S. In 0.6 mol/L Na2SO, solution, Rd could be arranged in a decreasing order as follows： withdrawn specimens exposed for 20 a in coastal atmosphere〉withdrawn specimens exposed for 20 a in industrial atmosphere〉bare substrate of pure aluminum 8A06. This indi- cates that the protectiveness of corrosion products on the specimens exposed in coastal environment is better than that exposed in industrial environment.

关 键 词：AL 大气腐蚀 腐蚀产物 电子探针 波谱仪 电化学阻抗 

分 类 号：TG172.3[金属学及工艺—金属表面处理]