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Electroless Deposition of Ni-W-P Coating on AZ91D Magnesium Alloy

Author: ZhangYueTao
Tutor: ZhangTao
School: Harbin Engineering University
Course: Materials Science
Keywords: AZ91D Electroless plating Ni - W -P Heat treatment Many plated The stannate conversion of film
CLC: TQ153.1
Type: Master's thesis
Year: 2010
Downloads: 49
Quote: 0
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Abstract


With AZ91D magnesium alloy widely used in the AZ91D surface through appropriate treatment preparation of high hardness and high wear resistance and high corrosion resistance of electroless plating Ni-WP coating become the focus of current research . Characterized by SEM, XRD and EDS coating morphology, structure and composition . The use of dynamic polarization curves and electrochemical impedance spectroscopy to characterize the coating electrochemical performance , the use of micro hardness tester and wear tester to characterize the mechanical properties of the coating . Improved chromium- step pre-treatment process the AZ91D surface pretreatment and chemical deposition of Ni-WP coating , this coating is phosphorus coating is a mixture of amorphous and crystalline . AZ91D magnesium alloy corrosion resistance and microhardness have a significantly improved after electroless plating Ni-WP . The low-temperature heat treatment on the performance of the coating . Found that the low temperature heat treatment did not produce a completely crystalline structure of the coating , but increase the coating wear resistance and micro-hardness after heat treatment of 150 ° C mechanical properties of the coating . , Corrosion resistance increased at first and then decreased with increasing heat treatment temperature of 200 ° C to achieve the most value . By repeatedly plating the surface of the coating of Ni-WP extracellular substance dense, uniform composition and also phosphorus alloy is a mixture of amorphous and microcrystalline . Coating directly plated Ni-WP coating , micro-hardness and wear resistance is greatly improved by repeated plating coating also has a strong corrosion resistance . This is the best in the AZ91D surface preparation of high-performance Ni - WP coating obtained in this process . Preparation of electroless plating Ni-WP in AZ91D magnesium alloy prefabricated stannate conversion coating after electroless plating Ni - WP characterization of coating performance found stannate conversion coating of two surface protection means effectively combine will help enhance the AZ91D corrosion resistance and mechanical properties of magnesium alloy .

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CLC: > Industrial Technology > Chemical Industry > Electrochemical industries > Electroplating industry > A single metal plating
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