316L不锈钢在FeCl3溶液中点蚀行为的电化学噪声检测
Detection of Pitting Corrosion of 316L Stainless Steel in FeCl3 Solution by Electrochemical Noise
摘 要
利用电化学噪声技术检测了316L不锈钢在6% FeCl3溶液中点蚀的电化学噪声谱, 观测腐蚀形貌, 分析电化学噪声谱特征参数。结果表明, 在浸泡初期, 电流噪声波动较小, 有暂态峰出现, 电流功率谱密度(PSDI)的斜率变化不大, 表明电极表面出现亚稳态蚀点, 钝化膜溶解与修复交替进行。在腐蚀后期, PSDI出现高频白噪声水平, 电流噪声波动增大, PSDI的斜率和低频白噪声水平发生突变, 这时电极表面亚稳态蚀点转化为稳定的蚀点。
点蚀
电化学噪声
噪声电阻
电流功率谱密度
stainless steel
pitting corrosion
electrochemical noise
noise resistance
power spectrum density
Abstract
Electrochemical noise was used to detect the pitting corrosion of 316L stainless steel in FeCl3 solution. The corrosion morphology was observed and the electrochemical noise characteristic parameters were analyzed. The results showed that in the initial stage of the immersion test, the fluctuation amplitude of the electrochemical noise was small and transient peaks appeared. The slope change of the current power spectrum density (PSDI) was insignificant. It was indicated that the meta-stable pitting occurred at the electrode surface and the dissolution and restoration of passive films took place alternately. In the later period of corrosion process, a high frequency plateau of white noise appeared in the power spectrum, the amplitude of the current oscillation increased and the slope of PSDI had a great change, indicating the transformation from meta-stable pitting to stable pitting corrosion.
中图分类号 TG174.3
所属栏目 试验研究
基金项目 国家高技术研究发展计划项目(2009AA063405-04)
收稿日期 2010/9/14
修改稿日期 2010/11/1
网络出版日期
作者单位点击查看
引用该论文: JIA Zhi-jun,DU Cui-wei,LI Xiao-gang. Detection of Pitting Corrosion of 316L Stainless Steel in FeCl3 Solution by Electrochemical Noise[J]. Corrosion & Protection, 2011, 32(7): 497
被引情况:
【1】刘晓伟,曾维明,康娟,张锐锋,庞飞飞,李宇春, "不锈钢1.4529的耐蚀性",腐蚀与防护 34, 778-780(2013)
【2】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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【5】张昭, 张鉴清, 王建明, 等. 硫酸钠溶液中2024-T3铝合金孔蚀过程的电化学噪声特征[J]. 中国有色金属学报, 2001, 11(2): 284-287.
【6】Lafront A, Zhang W, Jin S, et al. Pitting corrosion of AZ91D and AJ62x magnesium alloys in alkaline chloride medium using electrochemical techniques[J]. Electrochim Acta, 2005, 51(3):489.
【7】Cheng Y, Luo J, Wlilmott M. Spectral analysis of electrochemical noise with different transient shapes[J]. Electrochim Acta, 2000, 45(11):1763.
【8】陈崇木, 张涛, 邵亚薇, 等. AZ91D镁合金在NaCl溶液中腐蚀过程的电化学噪声分析[J]. 腐蚀科学与防护技术, 2009, 21(1): 15-19.
【9】胡丽华, 杜楠, 王梅丰, 等. 电化学噪声和电化学阻抗谱检测1Cr18Ni9Ti不锈钢的初期点蚀行为[J]. 中国腐蚀与防护学报, 2007, 27(4): 233-237.
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【11】Tohio Shibata, Magda A M Ameer. Stochastic process of pit generation on zirconium with an anodic oxide film[J]. Corrosion Science, 1999, 33(10):1633-1643.
【12】Zhang T, Liu X L, Shao Y W, et al. Electrochemical noise analysis on the pit corrosion susceptibility of Mg-10Gd-2Y-0.5Zr, AZ91D alloy and pure magnesium using stochastic model[J]. Corrosion Science, 2008, 50(12):3500-3507.
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