ELECTROCHEMICAL CORROSION BEHAVIOR OF NICKEL COATING WITH HIGH DENSITY OF NANO-SCALE TWINS

J Chin Soc Corr Pro

2009, Vol. 29

Issue (2): 99-103 DOI:

技术报告

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ELECTROCHEMICAL CORROSION BEHAVIOR OF NICKEL COATING WITH HIGH DENSITY OF NANO-SCALE TWINS

ZHANG Yi¹;MENG Guozhe¹;SHAO Yawei¹;ZHANG Tao¹;WANG Fuhui^1;2

1. College of Materials Science and Chemical Engineering; Harbin Engineering University; Harbin 150001
2. State Key Laboratory for Corrosion and Protection; Institute of Metal Research;Chinese Academy of Sciences; Shenyang 110016

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Abstract

A nickel coating with high density nano--scale twins has been synthesized on
Q235 steel by using pulsed electrodeposition technique. The potentiodynamic polarization measurements were performed on nano--scale twin nickel coating and cast nickel in 0.1mol/L H₃BO₃+ 0.025 mol/L Na₂B₄O₇buffer solution with pH= 8.4. The results indicated that both samples showed auto--passivated behavior, while nano-scale twin nickel coating possessed higher corrosion resistance and better passive property than cast nickel. The effect of nano-scale twin structure on the properties of passive film was investigated in terms of thermodynamics and kinetics by using Mott-Schottky relationship and point defect model (PDM). It demonstrated that nano--scale twin structure has little effect on the defect density, but has great effect on the diffusion coefficient (D_m). It is the main cause to the formation of a thinner, more compact and higher corrosion resistant film on the nano-scale twin nickel coating.

Key words: nano-scale twin passive film Mott-Schottky relationship defect diffusion coefficient

Received: 08 June 2007

ZTFLH:

TG146.2

Corresponding Authors: MENG Guozhe E-mail: mengguozhe@hrbeu.edu.cn

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Cite this article:

ZHANG Yi MENG Guozhe SHAO Yawei ZHANG Tao WANG Fuhui. ELECTROCHEMICAL CORROSION BEHAVIOR OF NICKEL COATING WITH HIGH DENSITY OF NANO-SCALE TWINS. J Chin Soc Corr Pro, 2009, 29(2): 99-103.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2009/V29/I2/99

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