ELECTROCHEMICAL NOISE FEATURES OF PURE ALUMINUM DURING PITTING CORROSION IN NEUTRAL NaCl SOLUTION

金属学报(英文版), 2003, 16(1): 22-30.

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1.Department of Chemistry, Zhejiang University, Hangzhou 310027, China

2.Department of Chemistry, Zhejiang University, Hangzhou 310027, China

3.Department of Chemistry, Zhejiang University, Hangzhou 310027, China

4.Department of Chemistry, Zhejiang University, Hangzhou 310027, China

5.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

6.Department of Chemistry, Zhejiang University, Hangzhou 310027, China

7.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

基金项目: Foundation of State key Laboratory for Corrosi and Protection (China) 国家重点基础研究发展计划(973计划)(G199g0650) 国家自然科学基金(50071054)

ELECTROCHEMICAL NOISE FEATURES OF PURE ALUMINUM DURING PITTING CORROSION IN NEUTRAL NaCl SOLUTION

Keywords： pure aluminum

Spontaneous electrochemical noise (EN) can be a rich source of information concern-ing the processes simultaneously occurring at a corroding interface. Potential noisefluctuations during the free corrosion of pure aluminum in different concentration ofneutral sodium chloride solution are investigated, and the breakdown and restorationof passive metal's film are studied using potentiodynamic scanning (PDS) measure-ments and electrochemical impedance spectroscopy (EIS) technique. Two capacitanceloops are observed in the Nyquist plots in two kinds of concentration, and the corro-sion process is under activation control at first, then become diffusion control withinthe oxide film and corrosion products of (Al(OH)p-m Cl-m) accumulated on the surfaceof the corroding electrode. It is suggested that the pitting corrosion is much easierto occur for pure aluminum in 7.0wt% than in 2.0wt% NaCl solution, and the highconcentration 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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ELECTROCHEMICAL NOISE FEATURES OF PURE ALUMINUM DURING PITTING CORROSION IN NEUTRAL NaCl SOLUTION

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