DOI:10.11973/fsyfh-202302013硼对装饰用不锈钢组织与耐蚀性的影响刘涛1,王晓晨2(1.重庆工程职业技术学院,重庆450046;2.重庆大学,重庆400044)摘要:通过金相显微镜、扫描电镜和电化学工作站等设备,研究了固溶态和时效态无硼和含硼(质量分数0.004%)不锈钢的显微组织和耐蚀性。结果表明:固溶态无硼不锈钢和含硼不锈钢的组织都为单一奥氏体,时效态不锈钢中会析出σ相,硼的添加有助于改善不锈钢中富钼σ相的存在形式;相较于无硼不锈钢,含硼不锈钢的自腐蚀电位更正,腐蚀电流密度、点蚀电位和腐蚀速率更小,表明其具有更好的耐蚀性;与无硼不锈钢比,相同热处理条件下含硼不锈钢的容抗弧半径和相位角更大、钝化膜电阻更小;随着时效时间延长,无硼不锈钢与含硼不锈钢的电荷转移电阻和钝化膜电阻都逐渐减小,双电层电容和钝化膜电容都逐渐增大;含硼不锈钢的耐点蚀性能优于无硼不锈钢,这主要与硼加入后改善了不锈钢中σ相的存在形式,提高了钝化膜的致密度和稳定性有关。关键词:不锈钢;硼;时效;显微组织;耐点蚀性能中图分类号:TG142.71文献标志码:A文章编号:1005-748X(2023)02-0075-07EffectofBorononMicrostructureandCorrosionResistanceofDecorativeStainlessSteelLIUTao1,WANGXiaochen2(1.ChongqingVocationalInstituteofEngineering,Chongqing450046,China;2.ChongqingUniversity,Chongqing400044,China)Abstract:ThemicrostructureandcorrosionresistanceofB-freeandB-containing(massfractionof0.004%)stainlesssteelsinsolidsolutionstateandagingstatewerestudiedbymeansofmetallographicmicroscopy,scanningelectronmicroscopy(SEM)andelectrochemicalworkstation.TheresultsshowedthatthemicrostructureofB-freeandB-containingstainlesssteelsinsolidsolutionstatewassingleaustenite,andσphaseprecipitatedinstainlesssteelinagingstate.TheadditionofBwashelpfultoimprovetheexistenceformofMo-richedσphaseinthestainlesssteel.ComparedwiththeB-freestainlesssteel,theB-containingstainlesssteelhadamorepositivecorrosionpotential,andthecorrosioncurrentdensity,pittingpotentialandcorrosionrateofB-containingstainlesssteelwerelower,whichindicatedthattheB-containingstainlesssteelhadbettercorrosionresistance.ComparedwiththeB-freestainlesssteelunderthesameheattreatmentconditions,thecapacitivearcradiusandphaseangleoftheB-c...
