敏化态304不锈钢慢速率拉伸腐蚀过程的电化学噪声检测
Electrochemical Noise Detection During Slow-strain-rate-testing of Sensitized 304SS
摘 要
采用电化学噪声方法对敏化态304不锈钢在0.5 mol/L Na2S2O3溶液的慢速率拉伸过程的腐蚀进行检测, 同时得到腐蚀过程的电位与电流变化曲线, 试验后试样表面出现了多处应力腐蚀裂纹。分别采用时域谱、频域谱及小波分解分析电流噪声数据, 表明腐蚀过程经历了应力腐蚀裂纹萌生与裂纹扩展的过程。根据多种电化学噪声谱图及小波分解后的能量分布变化可以区分应力腐蚀过程的不同阶段。本工作为现场腐蚀检测奠定了一定基础。
慢拉伸试验
敏化态不锈钢
应力腐蚀开裂
electrochemical noise
slow-strain-rate-testing
sensitized stainless steel
stress corrosion cracking
Abstract
The corrosion behaviors of sensitized 304 SS were studied in 0.5 mol/L Na2S2O3 solution under slow-strain-rate-testing (SSRT) condition by electrochemical noise (EN). The electrochemical voltage and current noise were measured simultaneously in the zero resistance ammeter (ZRA) mode. There were several cracks at the surface of the specimen. In order to characterize the stress corrosion cracking (SCC) processes of sensitized 304SS, time analysis of the current data along with the spectral estimation that the using (FFT) method and Wavelet analysis gave useful information of these corrosion processes. The results showed SCC processes consisted of crack initiation and crack propagation. According to the varieties of spectrums in time, frequency domain and current energy distribution by wavelets analysis, the different state can be distinguished. The present work contribute to the research of indicator for real-time detection of SCC in plant.
中图分类号 TG174.3
所属栏目 试验研究
基金项目 国家重点基础研究发展规划项目(2006CB605004)资助
收稿日期 2011/2/25
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备注赵茹,讲师,博士,
引用该论文: ZHAO Ru,SONG Shi-zhe,ZHANG Zheng. Electrochemical Noise Detection During Slow-strain-rate-testing of Sensitized 304SS[J]. Corrosion & Protection, 2012, 33(1): 16
被引情况:
【1】刘士强,王立达,宗秋凤,张开悦,张成,刘贵昌, "铝基水滑石涂层腐蚀行为的电化学噪声特征",腐蚀与防护 35, 1-4(2014)
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【3】Kim S W,Kim H P. Electrochemical noise analysis of PbSCC of alloy 600 SG tube in caustic environments at high temperature[J]. Corrosion Science,2009,51(1):191-196.
【4】Le Canut J M,Maximovitch S,Dalard F. Electrochemical characterization of nickel-based alloys in sulphate solutions at 320 ℃[J]. Journal of Nuclear Materials,2004,334:13-27.
【5】Arganis-Juarez C R,Malo J M,Uruchurtu J. Electrochemical noise measurements of stainless steel in high temperature waters[J]. Nuclear Engineering and Design,2007,237(24):2283-2291.
【6】张鉴清, 张昭, 王建明. 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, 121(15): 310-320.
【7】Zhang Tao,Shao Yawei,MengGuozhe. Wang Fuhui Electrochemical noise analysis of the corrosion of AZ91D magnesium alloy in alkaline chloride solution[J]. Electrochimica Acta,2007,53(2):561-568.
【8】Jones R H. Stress Corrosion Cracking[M]. Materials Park Ohio:ASM Inter,1992:181-187.
【9】Wells D B,Stewart J,Davidson R,et al. The mechanism of intergranular stress corrosion cracking of sensitized austenitic stainless steel in dilute thiosulphate solution[J]. Corrosion Science,1992,33(1):39-53.
【10】Kovac J,Leban M,Legat A. An attempt to detect SCC by combined measurements of electrochemical noise and acoustic emission[J]. Materials and Corrosion,2007,58(12):970-976.
【11】Uruchurtu J C,Dawson J L. Noise analysis of pure aluminum under different pitting conditions[J]. Corrosion,1987,43(1):19-26.
【12】Aballe A,Bethencourt M,Botana F J,et al. Using wavelets transform in the analysis of electrochemical noise data[J]. Electrochimica Acta,1999,44(26):4805-4816.
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