2205双相不锈钢在硫酸中的腐蚀性能
Corrosion Resistance of 2205 Duplex Stainless Steel in Sulfuric Acid Solutions
摘 要
采用腐蚀浸泡失重方法结合动电位极化曲线和电化学阻抗谱,研究了不同温度下2205双相不锈钢在不同浓度H2SO4溶液中的耐蚀性,并与传统的20R钢和316L不锈钢作对比.结果表明,三种材质的耐蚀能力由强到弱排序为:2205>>316L>20R;硫酸浓度和温度对腐蚀速率的影响由强到弱排序都为:20R>316L>2205.在T≤40 ℃,2205双相不锈钢的腐蚀深度为0 mm/a,耐蚀性等级为1级,评定为完全耐蚀;当温度增加至60 ℃且硫酸浓度为30%时,其腐蚀速率显著增加,腐蚀深度为27.026 mm/a,耐蚀性等级为10级,评定为不耐蚀.高铬含量可以降低不锈钢材料的钝化电位,另一方面可以增强不锈钢表面钝化膜的修复能力,可能是2205双相不锈钢比316L和20R更耐蚀的本质原因.
硫酸
耐蚀性
电化学
腐蚀失重
duplex stainless steel
sulfuric acid
corrosion resistance
electrochemistry
corrosion weight loss
Abstract
The corrosion resistance of 2205 duplex SS in H2SO4 was investigated and compared with the conventional 316L SS and 20R steel by the conventional weight loss method together with the measurement of potentiodynamic polarization curves and electrochemical impedance spectroscopy.The results showed that the order of corrosion resistance to H2SO4 from high to weak was 2205>>316L>20R;the orders of influence of H2SO4 concentration and temperature from high to low was 20R>316L>2205.As T≤40 ℃,the corrosion velocity of 2205 duplex SS was zero,indicating non-corrosion in H2SO4 for 2205 duplex SS with a corrosion evaluation of level 1.As the temperature increased to 60 ℃ and the concentration of H2SO4 was up to 30%,the corrosion velocity of 2205 duplex SS increased greatly to 27.026 mm/a,indicating obvious corrosion in H2SO4 for 2205 duplex SS with a corrosion evaluation of level 10.The higher content of Cr in 2205 duplex SS was contributed to the much enhanced corrosion resistance because it can reduce the passivation potential and enhance the ability to damage repairing of passivation film.
中图分类号 TG172.6 DOI 10.11973/fsyfh-201506006
所属栏目 试验研究
基金项目 辽宁省自然科学基金项目(201202127)
收稿日期 2014/6/30
修改稿日期
网络出版日期
作者单位点击查看
联系人作者陈吉(jchenLsu@qq.com)
备注陈吉(1974-),教授,博士,从事材料表面改性技术研究.
引用该论文: ZHAO Tian-yu,CHEN Ji,SUN Yan-wei,Chen Xiao-ming,XU Zhi-xian. Corrosion Resistance of 2205 Duplex Stainless Steel in Sulfuric Acid Solutions[J]. Corrosion & Protection, 2015, 36(6): 535
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参考文献
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【3】赵林松,李明,赵彦芬.某热电厂锅炉内20G省煤器管子泄露事故分析[J].电力安全技术,2013,15(11):34-36.
【4】PARK S A,LEE S H,KIM J G.Effect of chromium on the corrosion behavior of low alloy steel in sulfuric acid[J].Metals and Materials International,2012,18(6):975-987.
【5】JI W S,JANG Y W,KIM J G.Effect of tungsten on the corrosion behavior of sulfuric acid-resistant steels for flue gas desulfurization system[J].Metals and Materials International,2011,17(3):463-470.
【6】牛继龙.耐硫酸露点腐蚀钢NNS的腐蚀速率的研究[J].南钢科技与管理,2011,30(2):30-32.
【7】郑文龙,俞亚鹏.耐硫酸露点腐蚀用钢ND钢性能及使用情况[J].石油化工腐蚀与防护,1997,14(2):19-21.
【8】小若正伦.金属的腐蚀破坏与防蚀技术[M].北京:化学工业出版社,1988.
【9】RAJAPB R N,SETHURAMANMG M J.Natural products as corrosion inhibitor for metals in corrosive media:A review[J].Materials Letter,2008,62(9):113-116.
【10】林玉珍,杨德钧.腐蚀和腐蚀控制原理[M].北京:中国石化出版社,2007.
【11】沈敏,罗永恒,覃永国,等.耐硫酸露点腐蚀LGNS钢板的开发[J].柳钢科技,2013,12(5):35-37.
【12】ALEC G.Corrosion of metallic constructions and equipment in petroleum products[J].Corrosion in Systems for Storage and Transportation of Petroleum Products and Biofuels,2014,13(6):57-143.
【13】吴玖.双相不锈钢[M].北京:冶金工业出版社,1999.
【14】PUTHUPARAMBIL M A,PAULRAJ S,SIVANANDAM A.Characterization of microstructure,toughness,and chemical composition of friction-welded joints of UNS S32205 duplex stainless steel[J].Friction,2014,2(1):82-91.
【15】谢中伟,韩甬梅.2205双相不锈钢泵用焊接件质量评定[J].热加工工艺,2013,42(19):165-167.
【16】黄建中,左禹.材料的耐蚀性和腐蚀数据[M].北京:化学工业出版社,2002.
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