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2010•Surface and Interface AnalysisRequires access

Corrosion resistance of ZnNiP+Ni composite coatings

Julian Kubisztal, J. Niedbała, A. Budniok

Open publisher page 6 citations

Abstract

Abstract 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 γNi 5 Zn 21 phase in composite matrix. Copyright © 2010 John Wiley & Sons, Ltd.

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What this paper is about

Abstract 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 γNi 5 Zn 21 phase in composite matrix. Copyright © 2010 John Wiley & Sons, Ltd.

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Available abstract

Abstract 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 γNi 5 Zn 21 phase in composite matrix. Copyright © 2010 John Wiley & Sons, Ltd.

Key concepts: Corrosion, Materials science, Dielectric spectroscopy, Composite number, Nickel, Metallurgy, Alloy, Oxide

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