Laser Surface Modification of Lean-alloyed Austenitic Stainless Steel for Corrosion Resistance

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• 作者：Chan W KKwok C TChan M CLo K H
• 会议时间：2012-10-14
• 关键词：laser surface melting ; HPDL ; lean-alloyed austenite stainless steel ; pitting corrosion ; citric acid passivation
• 作者单位：University of Macau Av. Padre Tomás Pereira Taipa Macau, China
• 母体文献：NACE东亚及太平洋地区国际腐蚀大会暨第三届NACE上海国际腐蚀年会论文集
• 会议名称：NACE东亚及太平洋地区国际腐蚀大会暨第三届NACE上海国际腐蚀年会
• 会议地点：上海
• 主办单位：中国机械工程学会
• 语种：chi

摘要

In order to reduce the cost of the austenitic stainless steels (ASSs),the expensive austenite former (nickel) is often substituted by manganese.However,manganese is generally seen to have a detrimental effect on the corrosion resistance. In the present study,the feasibility of laser surface modification of a lean-alloyed ASS (FeCrMn) for enhancing pitting corrosion resistance was investigated.Laser surface modification of FeCrMn was successfully achieved by a 2.3 kW high power diode laser (HPDL).Cyclic polarization tests for FeCrMn after laser surface modification in 3.5% NaCl solution at 25 ℃ were performed by using a potentiostat.The pitting resistance of the laser-modified specimens was found to be significantly improved as reflected by the noble shift in pitting potential.This could be attributed to redistribution of manganese sulphide leading to a more homogenous and refined microstructure.Pitting corrosion resistance of the laser-treated FeCrMn followed by subsequent citric acid passivation was found to be further improved as reflected by the noble shift in pitting potential to 0.18 V.