Q235钢在煤浸出液中的腐蚀行为
Corrosion Behavior of Q235 Steel in Coal Leaching Solution
摘 要
采用离子色谱对某长焰煤浸出液进行了成分分析，用电化学阻抗谱和极化曲线研究了煤浸出液中离子含量和温度对Q235钢腐蚀的影响，用失重试验研究了Q235钢在不同转速和不同溶液中的腐蚀行为。结果表明:煤浸出液中主要的阳离子为Na+和Ca2+，主要的阴离子为SO42-和Cl-;煤浸出液中离子含量增加和温度升高都会使Q235钢的耐蚀性降低;转速增大，Q235钢在煤浸出液中的腐蚀速率增大，当转速为60 r/min时，Q235钢的腐蚀速率达到0.304 7 mm/a，约为静态时的2.3倍;Cl-和SO42-含量的增加都会促进Q235钢的腐蚀，SO42-和Cl-同时存在对Q235钢的侵蚀作用增强。
煤浸出液
运煤敞车
腐蚀
电化学阻抗谱
极化曲线
Q235 steel
coal leaching solution
coal open wagon
corrosion
electrochemical impedance spectroscopy
polarization curve
Abstract
The composition of a long-flame coal leaching solution was analyzed by ion chromatography. The effects of ion concentration and temperature on the corrosion behavior of Q235 steel in coal leaching solution were investigated by electrochemical impedance spectroscopy and polarization curves. The corrosion behaviors of Q235 steel in different stirring rates and various solutions were analyzed through weight loss experiments. Results show that the main cations are Na+ and Ca2+ and the main anions are SO42- and Cl- in the coal leaching solution. The increase of ion concentration and temperature can reduce the corrosion resistance of Q235 steel in coal leaching solution. The corrosion rate of Q235 steel was accelerated with increasing stirring rate. When the stirring rate was 60 r/min, the corrosion rate reached 0.304 7 mm/a that was about 2.3 times higher than that in static state. Increasing concentration of Cl- or SO42-, or both existence of SO42- and Cl- in solution could promote corrosion of Q235 steel.
中图分类号 TG174 DOI 10.11973/fsyfh-201604007
所属栏目 试验研究
基金项目 上海市科委项目(10DZ2210400; 14DZ2261000)资助
收稿日期 2015/3/30
修改稿日期
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备注葛红花(1967-),教授,博士,从事腐蚀与防护和工业水处理研究,
引用该论文: XUE Hui,GE Hong-hua,JIANG Yi-kui,WEN Dong-hui,YUAN Qun. Corrosion Behavior of Q235 Steel in Coal Leaching Solution[J]. Corrosion & Protection, 2016, 37(4): 300
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参考文献
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【4】席时俊. 再论敞车的腐蚀及其防止[J]. 铁道车辆,1989(10):22-26.
【5】柳学坚. C62型车体腐蚀原因及厂修弥补措施[J]. 铁道机车车辆工人,2009(3):9-12.
【6】GALVELE J. Transport processes in passivity breakdown-II. full hydrolysis of the metal ions[J]. Corros Sci,1981,21(8):551-579.
【7】YANG Q,LUO J L. Effects of hydrogen and tensile stress on the breakdown of passive films on type 304 stainless steel[J]. Electrochim Acta,2001,46(6):851-859.
【8】张胜寒,韩丽燕,边娜. 循环冷却水系统腐蚀性能评价[J]. 山西化工,2008,28(4):43-45.
【9】安洋,徐强,吴子涛. 模拟循环冷却水中几种离子对碳钢腐蚀的影响[J]. 电镀与精饰,2011,4(33):35-39.
【10】LEE C T,QIN Z,ODZIEMKOWSKI M. The influence ofgroundwater anions on the impedance behaviourofcarbonsteel corroding under anoxic conditions[J]. Electrochimica Acta,2006,51:1558-1568.
【11】刘延湘,楼台芳. 炉水中侵蚀性阴离子对碳钢腐蚀的试验研究[J]. 工业水处理,2001,21(7):30-32.
【12】ZHOU X,YANG H Y,WANG F H. [BMIM]BF4 ionic liquids as effective inhibitor for carbon steel in alkaline chloride solution[J]. Electrochimica Acta,2011,56:4268-4275.
【13】陈旭,杜翠薇,李晓刚,等. 含水率对X70钢在鹰潭酸性土壤中腐蚀行为的影响[J]. 石油化工高等学校学报,2007,20(4):55-58.
【14】梁英教. 物理化学[M]. 北京:冶金工业出版社,1989:174-182.
【15】陈长风,路民旭,赵国仙,等. 温度、Cl-浓度、Cr元素对N80钢CO2腐蚀电极过程的影响[J]. 金属学报,2003,39(8):848-854.
【16】杨世伟,常铁军.材料腐蚀与防护[M]. 哈尔滨:哈尔滨工程大学出版社,2007.
【17】唐晓,王佳,李焰. 海水流动对A3钢的腐蚀速度的影响[J]. 海洋科学,2005,29(7):26-28.
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