Electrochemical corrosion behavior of nickel coating with high density nano-scale twins (NT) in solution with Cl

In this work, a nickel coating with high density nano-scale twins (NT) was synthesized on Q235 steel by using pulsed electrodeposition technique. The effects of NT structure on pitting corrosion resistance and semi-conducting properties of passive films formed on pure Ni in borate buffer solution wi...

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Bibliographic Details
Published in:Electrochimica acta 2009-02, Vol.54 (5), p.1578-1583
Main Authors: Sun, Feilong, Meng, Guozhe, Zhang, Tao, Shao, Yawei, Wang, Fuhui, Dong, Chaofang, Li, Xiaogang
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
Exact sciences and technology
Metals. Metallurgy
Mott–Schottky (M–S) relationship
Nano-scale twins
Passive films
Pitting corrosion
Vacancy diffusion coefficient
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Summary:In this work, a nickel coating with high density nano-scale twins (NT) was synthesized on Q235 steel by using pulsed electrodeposition technique. The effects of NT structure on pitting corrosion resistance and semi-conducting properties of passive films formed on pure Ni in borate buffer solution with chloride ions were investigated by the potentiodynamic polarization measurements and capacitance measurements. The results indicated that the passive films formed on NT coatings showed higher pitting corrosion resistance and a bi-layer semi-conducting structure distribution, comparing with those formed on industrial electrodeposited (IE) nickel. The passive films are p-type semi-conductors at low potentials, but they show an n-type semi-conductor behavior at high potentials. It demonstrated that NT structure decreased vacancy diffusion velocity and slowed down the growth of passive films consequently. This led to the enhancement of pitting resistance for NT nickel.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2008.09.047