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EFFECT OF Ni CONTENT ON CORROSION RESISTANCE OF ELECTROPLATED COATINGS OF Zn-Ni ALLOYS

Xiangqing Wu

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Abstract

The surface morphology and microstructure,chemical compositions and corrosion products of Zn-Ni alloy coatings with different Ni contents were examined by means of SEM,glow discharge optical emission spectrometry and XRD.The corrosion resistance of Zn-Ni alloy coatings was studied by neutralized salt spray test.The results show that when the thickness of Zn-Ni alloy coatings increases,the Ni content increases first and then decreases.There is an enrichment of Ni in the coatings.The Zn-Ni alloy coatings exhibit different and sophisticated alloy phase constituents when the Ni contents are between 5% to 15%.The corrosion resistance of a passivated Zn-Ni alloy coating is much better than that of the passivated ones such as Zn,Cd and alloys of Cd-Ti.The corrosion products of Zn-Ni alloys are mainly made of ZnO,ZnCl2·4Zn(OH)2 and a little 2ZnCO3·3Zn(OH)2.

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What this paper is about

The surface morphology and microstructure,chemical compositions and corrosion products of Zn-Ni alloy coatings with different Ni contents were examined by means of SEM,glow discharge optical emission spectrometry and XRD.The corrosion resistance of Zn-Ni alloy coatings was studied by neutralized salt spray test.The results show that when the thickness of Zn-Ni alloy coatings increases,the Ni content increases first and then decreases.There is an enrichment of Ni in the coatings.The Zn-Ni alloy coatings exhibit different and sophisticated alloy phase constituents when the Ni contents are between 5% to 15%.The corrosion resistance of a passivated Zn-Ni alloy coating is much better than that of the passivated ones such as Zn,Cd and alloys of Cd-Ti.The corrosion products of Zn-Ni alloys are mainly made of ZnO,ZnCl2·4Zn(OH)2 and a little 2ZnCO3·3Zn(OH)2.

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Available abstract

The surface morphology and microstructure,chemical compositions and corrosion products of Zn-Ni alloy coatings with different Ni contents were examined by means of SEM,glow discharge optical emission spectrometry and XRD.The corrosion resistance of Zn-Ni alloy coatings was studied by neutralized salt spray test.The results show that when the thickness of Zn-Ni alloy coatings increases,the Ni content increases first and then decreases.There is an enrichment of Ni in the coatings.The Zn-Ni alloy coatings exhibit different and sophisticated alloy phase constituents when the Ni contents are between 5% to 15%.The corrosion resistance of a passivated Zn-Ni alloy coating is much better than that of the passivated ones such as Zn,Cd and alloys of Cd-Ti.The corrosion products of Zn-Ni alloys are mainly made of ZnO,ZnCl2·4Zn(OH)2 and a little 2ZnCO3·3Zn(OH)2.

Key concepts: Materials science, Corrosion, Alloy, Metallurgy, Electroplating, Microstructure, 6111 aluminium alloy, Coating

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EFFECT OF Ni CONTENT ON CORROSION RESISTANCE OF ELECTROPLATED COATINGS OF Zn-Ni ALLOYS — Research Paper | ScholarLens