439超纯铁素体不锈钢耐蚀性评价
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摘要
通过盐雾试验、电化学试验和FeCl3点腐蚀试验,并结合扫描电镜,对比研究了439超纯铁素体不锈钢和430普通铁素体不锈钢的耐腐蚀性能。结果表明,碳、氮间隙元素极低的439超纯铁素体不锈钢耐点蚀性能明显优于430普通铁素体不锈钢,虽然430钝化膜修复能力较强,但点腐蚀速率也较快;430不锈钢具有严重的晶间腐蚀敏感性,同样,430普通不锈钢在干湿加速盐雾试验中发生了严重腐蚀,439超纯铁素体不锈钢在上述腐蚀试验中均表现出轻微的腐蚀。可见在430普通不锈钢基础上降低碳、氮间隙元素含量,同时加入钛稳定化元素,使其耐腐蚀性能大幅提高。
Combined with the SEM,the corrosion behavior of 439 ultra-pure ferritic stainless steel and 430 ferritic stainless steel has been compared by salt spray test,electrochemical test,FeCl3 point corrosion test.The result shows the pitting corrosion resistance of 439 ultra-pure ferritic stainless steel with extremely low carbon and nitrogen gap elements is better than that of 430 ferritic stainless steel.Although the capability of 430 passive film repair is stronger,the rate of pitting corrosion is faster.And 430 stainless steel has severe intergranular corrosion sensitivity,while 439 stainless steel is slightly lighter.Loop salt spray test shows that 430 stainless steel suffers severe corrosion,and 439 ultra-pure ferritic stainless steel has less corrosion.Therefore,on the basis of general 430,reducing the content of interstitial element carbon and nitrogen and adding the stabilizing element Ti can improve the corrosion resistance greatly.
Combined with the SEM,the corrosion behavior of 439 ultra-pure ferritic stainless steel and 430 ferritic stainless steel has been compared by salt spray test,electrochemical test,FeCl3 point corrosion test.The result shows the pitting corrosion resistance of 439 ultra-pure ferritic stainless steel with extremely low carbon and nitrogen gap elements is better than that of 430 ferritic stainless steel.Although the capability of 430 passive film repair is stronger,the rate of pitting corrosion is faster.And 430 stainless steel has severe intergranular corrosion sensitivity,while 439 stainless steel is slightly lighter.Loop salt spray test shows that 430 stainless steel suffers severe corrosion,and 439 ultra-pure ferritic stainless steel has less corrosion.Therefore,on the basis of general 430,reducing the content of interstitial element carbon and nitrogen and adding the stabilizing element Ti can improve the corrosion resistance greatly.
引文
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[2]翟瑞银,郑宏光,何慎,等.439铁素体不锈钢的研制[J].宝钢技术,2009(1):60.
[3]蔡珍,韩斌,谭文,等.钛微合金化技术发展现状[J].中国冶金,2015,25(2):1.
[4]游香米,姜周华,李花兵,等.超纯铁素体不锈钢的开发与应用现状[J].中国冶金,2006,16(11):16.
[5]董文卜,马力,李实,等.B443超低碳氮铁素体不锈钢的研究[J].宝钢技术,2007(1):5.
[6]Cihal V.A potentiokinetic reactivation method for predicting the I.C.C and I.G.S.C.C.sensitivity of stainless steels and alloys[J].Corrosion Science,1980,20(6):737.
[7]Majidi A P,Streicher M A.The double loop reactivation method for detecting sensitization in AISI304stainless steels[J].Corrosion,1984,40(11):584.
[8]HUANG H,LIU C,CHEN S.Electrolyte system of EPR test for detecting sensitization in austenitic stainless steel[J].Corrosion,1992,48(6):509.
[9]高中平,陈范才,赵常就.EPR法用于评价晶间腐蚀敏感性的各种判据的比较[J].中国腐蚀与防护学报,2000,20(4):243.
[10]才筝.太阳能热水器用不锈钢耐点蚀性能的研究[J].中国钢铁业,2017(3):34.
[11]余存烨.醋酸装置不锈钢设备点腐蚀原因分析与防护措施[J].全面腐蚀控制,2010,4(24):20.
[12]张丽,李学峰,张忠文,等.电化学动电位再活化法评价HR3C钢晶间腐蚀敏感性[J].腐蚀与防护,2013,34(10):923.
[13]杨瑞成,毕海娟,牛绍蕊,等.409L和430铁素体不锈钢耐局部腐蚀性能[J].北京科技大学学报,2011,33(4):428.