{"title":"等离子体渗氮温度对X80管线钢在3.5%NaCl溶液中渗氮层耐蚀性的影响","authors":"孙彦伟, 陈吉","doi":"10.11903/1002.6495.2014.281","DOIUrl":null,"url":null,"abstract":"X80 pipeline steel was nitridated by plasma nitriding and then its electrochemical corrosion behavior in 3.5% NaCl solution was studied by means of polarization curves and impedance spectroscopy. As compared to the bare X80 steel, the nitriding steels exhibit a remarkable increment in hardness, which increases with the rising nitriding temperature; the nitriding steels possess higher corrosion resistance with a lower corrosion current density by about one order of magnitude.The formation of e phase(Fe3N) with a small amount of γ ' phase(Fe4N) dominates on the surface of the steel nitridated at 450 ℃, resulting in a maximium in corrosion potential about-214 m V and a minimum in corrosion current density about 0.56 μA/cm2, respectively, togeter with the hardness increase to about 810 HV. Only the γ 'phase forms on the surface of the steel nitridated at 570 ℃,which contributes to the hardness increase to 930 HV and a obvious decrease of corrosion resistance. The plasma nitriding temperature determines the phase constitutes of the surface nitriding layer and affects greatly its hardness and corrosion resistance.","PeriodicalId":10727,"journal":{"name":"腐蚀科学与防护技术","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2015-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of Plasma Nitriding Temperature on Corrosion Resistance of Nitriding Layer on X80 Pipeline Steel in 3.5%NaCl Solution\",\"authors\":\"孙彦伟, 陈吉\",\"doi\":\"10.11903/1002.6495.2014.281\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"X80 pipeline steel was nitridated by plasma nitriding and then its electrochemical corrosion behavior in 3.5% NaCl solution was studied by means of polarization curves and impedance spectroscopy. As compared to the bare X80 steel, the nitriding steels exhibit a remarkable increment in hardness, which increases with the rising nitriding temperature; the nitriding steels possess higher corrosion resistance with a lower corrosion current density by about one order of magnitude.The formation of e phase(Fe3N) with a small amount of γ ' phase(Fe4N) dominates on the surface of the steel nitridated at 450 ℃, resulting in a maximium in corrosion potential about-214 m V and a minimum in corrosion current density about 0.56 μA/cm2, respectively, togeter with the hardness increase to about 810 HV. Only the γ 'phase forms on the surface of the steel nitridated at 570 ℃,which contributes to the hardness increase to 930 HV and a obvious decrease of corrosion resistance. The plasma nitriding temperature determines the phase constitutes of the surface nitriding layer and affects greatly its hardness and corrosion resistance.\",\"PeriodicalId\":10727,\"journal\":{\"name\":\"腐蚀科学与防护技术\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2015-09-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"腐蚀科学与防护技术\",\"FirstCategoryId\":\"1087\",\"ListUrlMain\":\"https://doi.org/10.11903/1002.6495.2014.281\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"Chemical Engineering\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"腐蚀科学与防护技术","FirstCategoryId":"1087","ListUrlMain":"https://doi.org/10.11903/1002.6495.2014.281","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Chemical Engineering","Score":null,"Total":0}
引用次数: 0
摘要
采用等离子体渗氮对X80管线钢进行氮化处理,并利用极化曲线和阻抗谱研究了X80管线钢在3.5% NaCl溶液中的电化学腐蚀行为。与裸X80钢相比,随着渗氮温度的升高,渗氮钢的硬度显著增加;氮化钢在腐蚀电流密度降低约一个数量级的情况下具有较高的耐蚀性。450℃氮化钢表面主要形成e相(Fe3N)和少量γ′相(Fe4N),最大腐蚀电位约为-214 m V,最小腐蚀电流密度约为0.56 μA/cm2,硬度提高到810 HV左右。570℃氮化钢表面仅形成γ′相,硬度提高到930 HV,耐蚀性能明显下降。等离子体渗氮温度决定了表面渗氮层的相组成,对渗氮层的硬度和耐蚀性有很大影响。
Effect of Plasma Nitriding Temperature on Corrosion Resistance of Nitriding Layer on X80 Pipeline Steel in 3.5%NaCl Solution
X80 pipeline steel was nitridated by plasma nitriding and then its electrochemical corrosion behavior in 3.5% NaCl solution was studied by means of polarization curves and impedance spectroscopy. As compared to the bare X80 steel, the nitriding steels exhibit a remarkable increment in hardness, which increases with the rising nitriding temperature; the nitriding steels possess higher corrosion resistance with a lower corrosion current density by about one order of magnitude.The formation of e phase(Fe3N) with a small amount of γ ' phase(Fe4N) dominates on the surface of the steel nitridated at 450 ℃, resulting in a maximium in corrosion potential about-214 m V and a minimum in corrosion current density about 0.56 μA/cm2, respectively, togeter with the hardness increase to about 810 HV. Only the γ 'phase forms on the surface of the steel nitridated at 570 ℃,which contributes to the hardness increase to 930 HV and a obvious decrease of corrosion resistance. The plasma nitriding temperature determines the phase constitutes of the surface nitriding layer and affects greatly its hardness and corrosion resistance.