| ELECTROCHEMICAL NOISE FEATURES OF PURE ALUMINUM DURING PITTING CORROSION IN NEUTRAL NaCl SOLUTION |
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| 引用本文： | F.H.Cao,Z.Zhang,Y.L.Cheng,J.F.Li,J.Q.Zhang,J.M.Wang,C.N.Cao. ELECTROCHEMICAL NOISE FEATURES OF PURE ALUMINUM DURING PITTING CORROSION IN NEUTRAL NaCl SOLUTION[J]. 金属学报(英文版), 2003, 16(1): 22-30 |
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| 作者姓名： | F.H.Cao Z.Zhang Y.L.Cheng J.F.Li J.Q.Zhang J.M.Wang C.N.Cao |
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| 作者单位： | F.H. Cao，Z. Zhang，Y.L. Cheng，J.F. Li，J.Q. Zhang，J.M.Wang and C.N. Cao Department of Chemistry，Zhejiang University，Hangzhou 310027，China State Key Laboratory for Corrosion and Protection of Metals，Institute of Metal Research，The Chinese Academy of Sciences，Shenyang 110016，China |
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| 基金项目： | The authors wish to acknowledge the financial support of the national key basic research foundation of China (Grant No. G19990650), the National Natural Science Foundation of China (Grant No. 50071054) and State key Laboratory for Corrosion and Protecti |
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| 摘 要： | Spontaneous electrochemical noise (EN) can be a rich source of information concerning the processes simultaneously occurring at a corroding interface. Potential noise fluctuations during the free corrosion of pure aluminum in different concentration of neutral sodium chloride solution are investigated, and the breakdown and restoration of passive metal's film are studied using potentiodynamic scanning (PDS) measurements and electrochemical impedance spectroscopy (EIS) technique. Two capacitance loops are observed in the Nyquist plots in two kinds of concentration, and the corrosion process is under activation control at first, then become diffusion control within the oxide film and corrosion products of (Al(OH)p-mCl-m) accumulated on the surface of the corroding electrode. It is suggested that the pitting corrosion is much easier to occur for pure aluminum in 7.0wt% than in 2.0wt% NaCl solution, and the high concentration of chloride ion in solution inhibits the repassivation of a metastable pit. The co
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| 收稿时间： | 2002-04-01 |
ELECTROCHEMICAL NOISE FEATURES OF PURE ALUMINUM DURING PITTING CORROSION IN NEUTRAL NaCl SOLUTION |
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| F.H.Cao,Z.Zhang,Y.L.Cheng,J.F.Li,J.Q.Zhang,J.M.Wang,C.N.Cao. ELECTROCHEMICAL NOISE FEATURES OF PURE ALUMINUM DURING PITTING CORROSION IN NEUTRAL NaCl SOLUTION[J]. Acta Metallurgica Sinica(English Letters), 2003, 16(1): 22-30 |
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| Authors: | F.H.Cao Z.Zhang Y.L.Cheng J.F.Li J.Q.Zhang J.M.Wang C.N.Cao |
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| Affiliation: | 1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China
2. Department of Chemistry, Zhejiang University, Hangzhou 310027, China;State Key Laboratory for Corrosion and Protection of Metals, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China |
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| Abstract: | Spontaneous electrochemical noise (EN) can be a rich source of information concerning the processes simultaneously occurring at a corroding interface. Potential noise fluctuations during the free corrosion of pure aluminum in different concentration of neutral sodium chloride solution are investigated, and the breakdown and restoration of passive metal's film are studied using potentiodynamic scanning (PDS) measurements and electrochemical impedance spectroscopy (EIS) technique. Two capacitance loops are observed in the Nyquist plots in two kinds of concentration, and the corrosion process is under activation control at first, then become diffusion control within the oxide film and corrosion products of (Al(OH)p-mCl-m) accumulated on the surface of the corroding electrode. It is suggested that the pitting corrosion is much easier to occur for pure aluminum in 7.0wt% than in 2.0wt% NaCl solution, and the high concentration of chloride ion in solution inhibits the repassivation of a metastable pit. The corrosion rate deterministic step does not involve Cl-. |
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| Keywords: | pure aluminum pitting corrosion electrochemical noise electrochemical impedance spectroscopy potentiodynamic scanning |
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