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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 509Improvement of Adhesion Strength of Electroless...

Improvement of Adhesion Strength of Electroless Nickel Coating on AZ91D by Anodized Oxide Interlayer

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Abstract:

Nickel-oxide duplex coatings were successfully deposited on magnesium alloy (AZ91D) by anodizing and electroless nickel-phosphorus plating processes. The anodizing interlayer was used to increase the adhesion strength of Ni-P layer. The electroless Ni-P coating enhances the corrosion resistance of the anodic oxide layer. Specimen of AZ91D magnesium alloy was polished firstly. The anodizing process was preceded in alkaline anodizing solution at 24 °C, and the bath voltage maintained at 70 volts for 2 hours. Successive electroless Ni-P plating was used to achieve the sandwich structure. The surface morphologies of the coatings were observed by field-emission scanning electron microscopy (FE-SEM). The adhesion strength was measured by pull-off tester. The electrochemical behavior of coatings with corrosion resistance in 3.5 wt.% NaCl solution was evaluated by potential polarization curve. The experimental results showed that the adhesion strength of directly deposited coating and duplex coating were 115.4 kg_f/cm² and 142.2 kg_f/cm², respectively. The adhesion strength of coatings on AZ91D magnesium alloy was improved by the synergistic effect between anodized magnesium oxide and Ni-P layer in duplex coating.

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Periodical:

Advanced Materials Research (Volume 509)

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90-95

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.509.90

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Online since:

April 2012

Authors:

Hsien Ta Hsu, Tsong Jen Yang

Keywords:

Adhesion, Anodizing, Corrosion Resistance, Electroless Plating (EP), Magnesium Alloy

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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