Laser Surface Modification of Lean-alloyed Austenitic Stainless Steel for Corrosion Resistance
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.
laser surface melting HPDL lean-alloyed austenite stainless steel pitting corrosion citric acid passivation
Chan W K Kwok C T Chan M C Lo K H
University of Macau Av. Padre Tomás Pereira Taipa Macau, China
国内会议
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
上海
英文
55-61
2012-10-14（万方平台首次上网日期，不代表论文的发表时间）