摘要
The corrosion process of AZ91D magnesium alloy in neutral 1%(mass fraction) sodium chloride aqueous solution was investigated by electrochemical noise(EN),SEM and EDX. Fractal theory was primarily used to depict the corrosion process of the alloy. The fast wavelet transform(FWT),as well as the fast Fourier transform(FFT),was employed to analyze the EN data. The results show that the overall corrosion process can be described by three stages. The first stage corresponds to the pit nucleation and growth; the second stage involves the growth of a passive oxide layer; and the third stage involves reactivation. With increasing immersion time,fractal dimension increases fast initially,fluctuates in the medium and increases again at last. Pitting corrosion and fractal dimension increase due to the initiation and formation of pits in the initial and the end of immersion,while depresses due to the passivation in the medium period. The results of SEM and EDX support the above conclusions.
The corrosion process of AZ91D magnesium alloy in neutral 1% （mass fraction） sodium chloride aqueous solution was investigated by electrochemical noise（EN）, SEM and EDX. Fractal theory was primarily used to depict the corrosion process of the alloy. The fast wavelet transform（FWT）, as well as the fast Fourier transform（FFT）, was employed to analyze the EN data. The results show that the overall corrosion process can be described by three stages. The first stage corresponds to the pit nucleation and growth; the second stage involves the growth of a passive oxide layer; and the third stage involves reactivation. With increasing immersion time, fractal dimension increases fast initially, fluctuates in the medium and increases again at last. Pitting corrosion and fractal dimension increase due to the initiation and formation of pits in the initial and the end of immersion, while depresses due to the passivation in the medium period. The results of SEM and EDX support the above conclusions.
出处
《中国有色金属学会会刊：英文版》
SCIE
EI
CAS
CSCD
2009年第2期496-503,共8页
Transactions of Nonferrous Metals Society of China
基金
Projects(50471043, 50771092) supported by the National Natural Science Foundation of China
Project(2005DKA10400-Z15) supported by the National R&D Infrastructure and Facility Development Program of China
Project supported by Key Laboratory for Ultra-light Materials and Surface-treatment Technology of Education Ministry of China
