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Corrosion resistance of ZnNiP+Ni composite coatings
Author(s) -
Kubisztal J.,
Niedbała J.,
Budniok A.
Publication year - 2010
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.3310
Subject(s) - corrosion , materials science , dielectric spectroscopy , composite number , nickel , metallurgy , alloy , oxide , electrochemistry , layer (electronics) , chemical engineering , composite material , chemistry , electrode , engineering
ZnNiP+Ni composite coatings were prepared by embedding nickel particles into ZnNiP 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) ZnNiP+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 ZnNiP+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 γNi 5 Zn 21 phase in composite matrix. Copyright © 2010 John Wiley & Sons, Ltd.