激光冲击对AISI430铁素体不锈钢抗蚀性影响  

Effect of laser shock peening on corrosion resistance of AISI430 ferritic stainless steel

作　　者：金成嘉 陈炳泉 李纬 焦加飞 任旭东[1] JIN Chengjia;CHEN Bingquan;LI Wei;JIAO Jiafei;REN Xudong(School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学机械工程学院,镇江212013

出　　处：《激光技术》2020年第2期212-216,共5页Laser Technology

基　　金：江苏省333资助项目(BRA2017389)。

摘　　要：为了提升AISI430铁素体不锈钢的表面抗腐蚀性能,采用激光冲击的方法强化了AISI430铁素体不锈钢。通过极化曲线及电化学阻抗谱等电化学实验方法,结合试样表面残余应力及腐蚀形貌,研究了激光冲击工艺对AISI430铁素体不锈钢的抗腐蚀能力的影响。结果表明,强化处理后试样表面出现残余压应力层,残余应力最大幅值高达-339MPa,并以近乎递减的方式延深度方向达到900μm;激光冲击强化使试样在NaCl溶液中的自腐蚀电位由-251mV最大提升至-192mV,腐蚀电流密度最多降低28.18μA/cm-2,使阻抗谱的容抗弧的半径变大,腐蚀凹坑和条带状腐蚀减少。激光冲击强化了AISI430铁素体不锈钢在NaCl溶液中的抗腐蚀性能。In order to improve the surface corrosion resistance of AISI430 ferritic stainless steel,laser shock peening(LSP)was used to strengthen AISI430 ferritic stainless steel.Polarization curves and electrochemical impedance spectroscopy were used to study the effect of laser shock processing on corrosion resistance of AISI430 ferritic stainless steel,combined with surface residual stress and corrosion morphology of the specimens.The results show that,residual compressive stress layer appears on specimens surface after strengthening treatment.The maximum residual stress is-339MPa.The depth direction is extended to 900μm in a nearly decreasing manner.Self corrosion potential of the sample in NaCl solution increases from-251mV to-192mV.Corrosion current density can be reduced by 28.18μA/cm-2 at most.It enlarges the radius of capacitive arc of impedance spectrum.Corrosion pits and strip corrosion are reduced.LSP strengthens corrosion resistance of AISI430 ferritic stainless steel in NaCl solution.

关 键 词：激光技术 激光冲击强化 AISI430铁素体不锈钢 残余应力 抗腐蚀性能 

分 类 号：TG156.99[金属学及工艺—热处理]