电化学噪声研究HSn701B铜合金在含NaCl循环水中的腐蚀
Electrochemical Noise Analysis for Corrosion of HSn701B Copper Alloy in Circulating Water with Different Concentrations of NaCl
摘 要
采用电化学噪声方法研究了火力发电厂凝汽器HSn701B铜管在不同浓度NaCl循环水中的腐蚀行为, 采用快速傅里叶变换(FFT)、快速小波变换(FWT)和散粒噪声理论结合统计方法分析原位电化学电位噪声。结果表明, 铜管在循环水中的腐蚀主要表现为局部腐蚀, 高浓度的Cl-能够促进腐蚀的发生。电化学噪声是一种能有效监控铜合金在循环水中腐蚀过程的方法。
腐蚀行为
铜合金
时频域分析
electrochemical noise
corrosion behavior
copper alloy
analysis in time and frequency domain
Abstract
The corrosion behaviors in chloride medium solutions of copper alloy (HSn701B) used in power plant condensers were investigated using electrochemical noise measurements. The potential noise was monitored and analyzed by fast Fourier transform (FFT), fast wavelet transform (FWT), shot noise theory and statistic theory. The results show that the corrosion of HSn701B alloy in circulating water was mainly expressed in the form of localized corrosion. The high concentration of Cl- may promote the corrosion behavior, which will result in serious pitting corrosion. Electrochemical noise(EN) is an efficient technology to monitor the corrosion process of copper alloy in circulating water.
中图分类号 TG174
所属栏目 试验研究
基金项目
收稿日期 2013/5/24
修改稿日期
网络出版日期
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联系人作者吴芳芳(wuff79@sina.com)
备注吴芳芳(1979-), 高级工程师, 硕士, 从事电厂化学研究,
引用该论文: WU Fang-fang,XIONG Bin,ZHOU Fei-mei,CAO Qiu-yang. Electrochemical Noise Analysis for Corrosion of HSn701B Copper Alloy in Circulating Water with Different Concentrations of NaCl[J]. Corrosion & Protection, 2014, 35(4): 362
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参考文献
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【3】TAN Y J, BAILEY S, KINSELLA B. The monitoring of the formation and destruction of corrosion inhibitor films using electrochemical noise analysis (ENA)[J]. Corros Sci, 1996, 38:1681-1695.
【4】CAO F H, ZHANG Z, SU J X, et al. Electrochemical noise analysis of LY12-T3 in EXCO solution by discrete wavelet transform technique[J]. Electrochimica Acta, 2006, 51:1359-1364.
【5】ZHANG T, SHAO Y W, MENG G Z, et al. Electrochemical noise analysis of the corrosion of AZ91D magnesium alloy in alkaline chloride solution[J]. Electrochimica Acta, 2007, 53:561-568.
【6】CHEN A N, CAO F H, LIAO X N, et al. Study of pitting corrosion on mild steel during wet-dry cycles by electrochemical noise analysis based on chaos theory[J]. Corrosion Science, 2013, 66:183-195.
【7】张鉴清, 张昭, 王建明, 等. 电化学噪声的分析与应用Ⅰ. 电化学噪声的分析原理[J]. 中国腐蚀与防护学报, 2001, 21(5): 310-320.
【8】张鉴清, 张昭, 王建明, 等. 电化学噪声的分析与应用Ⅱ. 电化学噪声的应用[J]. 中国腐蚀与防护学报, 2002, 22(4): 241-248.
【9】COTTIS R A. Interpretation of electrochemical noise data[J]. Corrosion, 2001, 57(3):265-285.
【10】AL-MAZEEDI H A A, COTTIS R A. A practical evaluation of electrochemical noise parameters as indicators of corrosion type[J]. Electrochim Acta, 2004, 49(17/18):2787-2793.
【11】CHEN A N, CAO F H, LIU W J, et al. Shot noise analysis on corrosion behavior of zinc ally (ZnAl4Cu1)under dry-wet cycles[J]. Trans Nonferrous Met Soc China, 2012, 22:228-240.
【12】SANCHEZ A J M, COTTIS R A, BOTANA F J. Shot noise and statistical parameters for the estimation of corrosion mechanisms[J]. Corros Sci, 2005, 47(12):3280-3299.
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