Corrosion resistance of ZnNiP+Ni composite coatings

ZnNiP+Ni composite coatings were prepared by embedding nickel particles into ZnNiP alloy using ammonia solution in which Ni powder was suspended by stirring. Such coatings have been deposited on a 0H18N9 stainless steel substrate under galvanostatic conditions (j = −40 mA cm−2), and at a tempera...

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Bibliographic Details
Published in:Surface and interface analysis 2010-06, Vol.42 (6-7), p.1222-1225
Main Authors: Kubisztal, J., Niedbała, J., Budniok, A.
Format: Article
Language:English
Subjects:
corrosion resistance
thermal treatment
ZnNiP+Ni composite coatings
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Summary:ZnNiP+Ni composite coatings were prepared by embedding nickel particles into ZnNiP alloy using ammonia solution in which Ni powder was suspended by stirring. Such coatings have been deposited on a 0H18N9 stainless steel substrate under galvanostatic conditions (j = −40 mA cm−2), and at a temperature of 293 K. In order to investigate corrosion properties of the as‐deposited and annealed (593 K for 2 h in argon atmosphere) ZnNiP+Ni composite coatings in 5% NaCl environment potentiodynamic technique and electrochemical impedance spectroscopy (EIS) were used. It was stated that thermal treatment strongly improved the corrosion parameters of the examined ZnNiP+Ni composite coatings, and also that better corrosion properties result from i) improved corrosion properties of the oxide layer; and ii) the presence of new γNi5Zn21 phase in composite matrix. Copyright © 2010 John Wiley & Sons, Ltd.
ISSN:0142-2421
1096-9918
DOI:10.1002/sia.3310