锅炉水冷壁管20G在含Cl-和SO2-4介质中的常温电化学特性
Electrochemical Properties of Boiler Water-wall Tube 20G in Cl- and SO2-4 Media
摘 要
采用常温电化学试验对水冷壁管材料20G在含有Cl-和SO42-的模拟平衡磷酸盐水工况溶液中的常温电化学性能进行了研究。结果表明, 常温下Cl-和SO42-都是侵蚀性阴离子, 对20G电极材料有侵蚀性, 能促进材料的溶解; 增加两种离子的浓度都能加速材料的腐蚀; 两种离子同时存在溶液中时,在材料表面有竞争吸附作用。
Cl-
SO42-
电化学方法
腐蚀
20G
Cl-
SO42-
electrochemical method
corrosion
Abstract
In order to investigate the corrosion behavior of water-wall tube material 20G in equilibrium phosphate treatment (EPT) solutions containing Cl- and SO42- ions, a series of electrochemical experiments were carried out to analyze the room-temperature electrochemical properties of 20G in simulated EPT solutions. The electrochemical parameters of corrosion potential (Ecorr), corrosion current density (Jcorr) and AC impedance (Rp) were used to compare the corrosion resistances of the material. The results show that, at room temperature, Cl- and SO42- ions are aggressive anions attacking 20G electrode material and promoting its dissolution. Increasing the concentrations of the two ions can accelerate the corrosion of the material. There is competitive adsorption between the two ions on the material surface when they both exist in the solution.
中图分类号 TG174 TQ150.1
所属栏目 试验研究
基金项目
收稿日期 2012/9/22
修改稿日期
网络出版日期
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备注卢国华,工程师,硕士,
引用该论文: LU Guo-hua,TANG Xue-ying,MA Cun-ren,JIAO Xiao-cui. Electrochemical Properties of Boiler Water-wall Tube 20G in Cl- and SO
被引情况:
【1】张清廉,李 铭,王起江, "20G无缝钢管穿孔泄漏失效分析",理化检验－物理分册 52, 265-267(2016)
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参考文献
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【2】刘延湘, 楼台芳. 低磷酸盐-低NaOH模拟炉水中20A碳钢的腐蚀[J]. 腐蚀科学与防护技术, 2003, 15(1): 9-12.
【3】杨道武, 朱志平, 李宇春, 等. 电化学与电力设备的腐蚀与防护[M]. 北京: 中国电力出版社, 2004: 51-54.
【4】朱志平, 黄可龙, 杨道武, 等. 锅炉给水系统腐蚀原因分析[J]. 腐蚀科学与防护技术, 2005, 17(3): 195-197.
【5】朱志平, 熊书华, 赵永福, 等. 锅炉水冷壁管材料20G和15CrMo在含Cl-溶液中的点蚀特性[J]. 中国电机工程学报, 2012, 32(2): 67-72.
【6】熊书华, 朱志平, 荆玲玲, 等. 锅炉水冷壁管在含SO42-溶液中的点蚀特性研究[J]. 热能动力工程, 2012, 27(1): 91-95.
【7】Abd El Meguid E A,Mahmoud N A,Abd El Rehim S S. The effect of some sulphur compounds on the pitting corrosion of type 304 stainless steel[J]. Materials Chem Phys,2000,63(1):67-74.
【8】Phanis S V,Aatpati A K,Muthe K P,et al. Comparison of rolled and heat treated SS304 in chloride solution using electrochemical and XPS techniques[J]. Corros Sci,2003,45(11):2467-2483.
【9】El-egamy S S,Badway W A. Passivity and passivity breakdown of 304 stainless steel in alkaline sodium sulphate solutions[J]. J Appl Electrochem,2004,34(11):153-1158.
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