STUDY ON THE ELECTROCHEMICAL CORROSION BEHAVIOR OF SPUTTERED Fe-20Cr NANOCRYSTALLINE COATING

J Chin Soc Corr Pro

2003, Vol. 23

Issue (2): 84-88 DOI:

Research Report

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STUDY ON THE ELECTROCHEMICAL CORROSION BEHAVIOR OF SPUTTERED Fe-20Cr NANOCRYSTALLINE COATING

Xueli Li;Ying Li;Fuhui Wang

中科院金属所金属腐蚀与防护国家重点实验室

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Xueli Li; Ying Li; Fuhui Wang. STUDY ON THE ELECTROCHEMICAL CORROSION BEHAVIOR OF SPUTTERED Fe-20Cr NANOCRYSTALLINE COATING. J Chin Soc Corr Pro, 2003, 23(2): 84-88 .

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Abstract The electrochemical corrosion behavior of Fe-20Cr s puttered coating has been investigated by electrochemical measurement and surfac e analysis techniques such as SEM,STM and EPMA.The sputtered coating with nanome ter grains showed the higher corrosion rate in acid solution with and without C l- even through a passive film formed on this coating automatically.On the oth er hand,the corrosion rate of Fe-20Cr cast alloy was lower and a passive film on ly formed when anodic potential was positive enough.The further research realize d that nanocrystallization,content and distribution of Cr in substrate and passi ve film were the main factors that affected the corrosion resistance of these ma terials.The sputter coating with smaller grain had a more amount of grain bounda ry where the amount of active atoms was more than that of the other area.This re sulted in the higher corrosion rate of the sputter coating.The homogenous distr ibution of Cr element in the sputter coating make it easy to form a passive film on its surface.The lower concentration of Cr in the passive film of sputter coa ting results the higher diffusion limited current density on the passive film.

Key words: sputtered nanocrystalline coating passtion passive film

Received: 04 July 2001

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TG174.71

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2003/V23/I2/84

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