Evaluation of corrosion resistance of AA6082-T651 aluminium alloy after laser shock peening by means of cyclic polarisation and ElS methods

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• 作者：Uro&scaron ; Trdan ^{uros.trdan@fs.uni-lj.si} ; Janez Grum ; ^{janez.grum@fs.uni-lj.si}
• 关键词：A. Aluminium ; B. Cyclic polarisation ; B. EIS ; B. XPS ; C. Passive films ; C. Pitting corrosion
• 刊名：Corrosion Science
• 出版年：2012
• 期刊代码：28_0010938x
• 类别：ch
• 出版时间：June, 2012
• 卷：59
• 期：Complete
• 页码：324-333
• 文件大小：1678 K

摘要

Laser shock peening (LSP) without ablative coating at various power densities was applied to AA6082 aluminium alloy to investigate corrosion behaviour in a 0.6 M NaCl solution. Cyclic polarisation results showed enhanced passivity with corrosion current reduction by as much as a factor of 12, compared to the untreated specimen. Additionally, EIS after 24 h confirmed almost seven times higher polarisation resistance after LSP, compared to the untreated specimen (45 and 6.7 k惟 cm²). XPS analysis indicated Al₂O₃ enrichment, which contributed to higher corrosion resistance with reduced anodic dissolution of the LSP-treated surface due to plasma ablation and shock waves.