| Corrosion Resistance of Ni-P Composite Coating on Mg Alloy： Critical Role of the Intermediate Phosphate Conversion Coating Layer for Suppressing Galvanic Couple Formation |
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| 作者姓名： | WANG Yuhang GUO Liangshuai ZHOU Peng ZHANG Tao WANG Fuhui |
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| 作者单位： | Shenyang National Laboratory for Materials Science， Northeastern University， Shenyang 110819， Liaoning， China;Shenyang National Laboratory for Materials Science， Northeastern University， Shenyang 110819， Liaoning， China;Tianjin Aerospace Long March Rocket Manufacturing Co.， Ltd.， Tianjin 300462， China |
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| 摘 要： | Electroless nickel (EN) plating can give rise to the severe galvanic corrosion of the magnesium (Mg) alloy matrix， owing to its nobler electrochemical potential than Mg alloy. To hinder the formation of galvanic couple， an intermediate phosphate conversion coating (PCC) layer is introduced between the EN layer and the Mg alloy matrix. Since the ceramic-like PCC layer cannot be catalyzed， a low-cost Ag-activation technique is used to process the PCC layer before electroless plating. The cross-section morphology and element distribution of the PCC-EN composite coating indicate that the PCC intermediate layer can effectively separate the Mg alloy from the EN layer. Moreover， the results of electrochemical tests suggest that the PCC-EN composite coating has a better corrosion resistance in comparison with the EN coating and AZ91D Mg alloy.
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| 关 键 词： | AZ91D magnesium (Mg) alloy phosphate conversion coating electroless plating corrosion resistance composite coating |
Corrosion Resistance of Ni-P Composite Coating on Mg Alloy:Critical Role of the Intermediate Phosphate Conversion Coating Layer for Suppressing Galvanic Couple Formation |
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| WANG Yuhang,GUO Liangshuai,ZHOU Peng,ZHANG Tao,WANG Fuhui.Corrosion Resistance of Ni-P Composite Coating on Mg Alloy:Critical Role of the Intermediate Phosphate Conversion Coating Layer for Suppressing Galvanic Couple Formation[J].Aerospace Shanghai,2022,39(1):102-110. |
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| Authors: | WANG Yuhang GUO Liangshuai ZHOU Peng ZHANG Tao WANG Fuhui |
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| Abstract: | Electroless nickel(EN)plating can give rise to the severe galvanic corrosion of the magnesium(Mg) alloy matrix,owing to its nobler electrochemical potential tha... |
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| Keywords: | AZ91D magnesium (Mg) alloy phosphate conversion coating electroless plating corrosion resistance composite coating |
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