Nb添加对金属注射成形420不锈钢耐腐蚀性能的影响
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摘要
为了探明Nb元素对金属注射成形420马氏体不锈钢腐蚀性能的影响及作用机理。采用金属注射成形工艺制备试样,利用扫描电子显微镜(SEM)、能谱仪(EDS)进行表征测试,浸泡失重和电化学工作站测试材料的耐腐蚀性能。结果表明:Nb元素通过碳化物的形式均匀分布在基体中。当提高碳含量时,浸泡实验样品腐蚀率增大,极化曲线点蚀电位左移,耐腐蚀性能降低。添加Nb元素后,浸泡实验样品腐蚀率减小,极化曲线点蚀电位右移,耐腐蚀性能提高。实验结果验证,Nb元素添加可提高金属注射成形420不锈钢耐腐蚀性能但高碳含量视效果有限。
In order to find out the effect of Nb element on the corrosion performance of metal injection molding 420 martensitic stainless steel and its mechanism. Samples were prepared by metal injection molding process, and characterized by scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS), soaking weight loss and corrosion resistance of electrochemical workstation test materials. The results show that the Nb element is uniformly distributed in the matrix by the form of carbide. When the carbon content is increased, the corrosion rate of the immersion test sample increases, the pitting potential of the polarization curve shifts to the left, and the corrosion resistance decreases. After adding Nb element, the corrosion rate of the immersion test sample is reduced,the pitting potential of the polarization curve is shifted to the right, and the corrosion resistance is improved. The experimental results show that the addition of Nb can improve the corrosion resistance of metal injection molding 420 stainless steel, but the high carbon content has limited effect.
In order to find out the effect of Nb element on the corrosion performance of metal injection molding 420 martensitic stainless steel and its mechanism. Samples were prepared by metal injection molding process, and characterized by scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS), soaking weight loss and corrosion resistance of electrochemical workstation test materials. The results show that the Nb element is uniformly distributed in the matrix by the form of carbide. When the carbon content is increased, the corrosion rate of the immersion test sample increases, the pitting potential of the polarization curve shifts to the left, and the corrosion resistance decreases. After adding Nb element, the corrosion rate of the immersion test sample is reduced,the pitting potential of the polarization curve is shifted to the right, and the corrosion resistance is improved. The experimental results show that the addition of Nb can improve the corrosion resistance of metal injection molding 420 stainless steel, but the high carbon content has limited effect.
引文
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[20]刘小瑞,汪若晨.4Cr13不锈钢热处理后组织及耐蚀性能研究[J].内江科技,2016,37(6):61-62.
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[23]于乾乾.NaCl溶液中离子注入铌316不锈钢的电化学行为[D].大连;大连海事大学,2014.
[2]ISFAHANY A N,SAGHAFIAN H,BORHANI G.The effect of heat treatment on mechanical properties and corrosion behavior of AISI420martensitic stainless steel[J].Journal of Alloys&Compounds,2011,509(9):3931-3936.
[3]BARLOW L D,TOIT M D.Effect of Austenitizing Heat Treatment on the Microstructure and Hardness of Martensitic Stainless Steel AISI420[J].Journal of Materials Engineering&Performance,2012,21(7):1327-1336.
[4]YE HeZhou,LIU XingYang,HONG HanPing.Fabrication of metal matrix composites by metal injection molding-A review[J].Journal of Materials Processing Tech,2008,200(1):12-24.
[5]胡潘,毛宏焕,杨弋涛.碳含量对430铁素体不锈钢耐晶间腐蚀性能的影响[J].腐蚀与防护,2016,37(12):956.
[6]郭富强,程世长,刘正东,等.碳、铌对ASME S30432奥氏体耐热钢晶间腐蚀性能的影响[J].机械工程材料,2007(08):11-14.
[7]邢文静,丁厚福,杜晓东,等.碳含量对低碳高合金钢组织及耐腐蚀行为的影响[J].熱加工工藝,2006,35(14):35-37.
[8]秦紫瑞,郭宁.铸造不锈钢含碳量对其局部腐蚀行为的影响[J].石油机械,1997,25(7):14-16.
[9]张翔,何浩,李益民,等.碳含量对金属注射成形17-4PH不锈钢显微组织和力学性能的影响[J].中国有色金属学报,2015(4):945-951.
[10]胡幼华.碳含量对MIM不锈钢烧结性能和腐蚀性能的影响[D].中南大学,2009.
[11]安传锋,何浩,尹健,等.C和Nb添加对金属注射成形420不锈钢组织及性能的影响[J].广西科技大学学报,2018(2).
[12]HAMDY A S;EL-SHENAWY E.;EL-BITAR T.Electrochemical impedance spectroscopy study of the corrosion behavior of some niobium bearing stainless steels in 3.5%NaCl[J].International Journal of Electrochemical Science,2006,1(4):171-180.
[13]Seo M,Hultquist G,Leygraf C,et al.The influence of minor alloying elements(Nb,Ti and Cu)on the corrosion resistivity of ferritic stainless steel in sulfuric acid solution[J].Corrosion Science,1986,26(11):949-960.
[14]金镇源.含铌铁素体不锈钢的电化学行为和钝化膜中各元素的分布[J].中国腐蚀与防护学报,1985,5(1):46-53.
[15]DALMAU A,RICHARD C,MU?OZ A I-.Degradation mechanisms in martensitic stainless steels:Wear,corrosion and tribocorrosion appraisal[J].Tribology International,2018,121:167-179.
[16]孙涛,邓博,徐菊良,等.氮、铌添加对304奥氏体不锈钢电化学腐蚀行为的影响[J].中国腐蚀与防护学报,2010,30(6):421-426.
[17]Nam N D,Kim J G.Effect of niobium on the corrosion behaviour of low alloy steel in sulfuric acid solution[J].Corrosion science,2010,52(10):3377-3384.
[18]王威,欧阳明亮,宋久鹏,等.金属注射成形技术在涡轮增压器零部件制造中的应用[J].车用发动机,2014(3):89-92.
[19]GUO Jia,YANG Shanwu,SHANG Chengjia,et al.Influence of carbon content and microstructure on corrosion behaviour of low alloy steels in a Clcontaining environment[J].Corrosion Science,2009,51(2):242-251.
[20]刘小瑞,汪若晨.4Cr13不锈钢热处理后组织及耐蚀性能研究[J].内江科技,2016,37(6):61-62.
[21]钱玉水.马氏体不锈钢在不同态下的腐蚀性能研究[D].太原;太原理工大学,2012.
[22]KUZUCU V,AKSOY M,KORKUT M H.The effect of strong carbide-forming elements such as Mo,Ti,V and Nb on the microstructure of ferritic stainless steel[J].Journal of Materials Processing Technology,1998,82(1-3):165-171.
[23]于乾乾.NaCl溶液中离子注入铌316不锈钢的电化学行为[D].大连;大连海事大学,2014.