| GUO Jia-cheng,XU Wen-bin,ZHANG Zhi-cheng,NIE Le-wen,GONG Lei-chao,DONG Jie,GUO Xing-wu,DING Wen-jiang.Preparation of High Infrared Emissivity and Electrical Conductivity Coating on Magnesium Alloy[J],46(3):47-52 |
| Preparation of High Infrared Emissivity and Electrical Conductivity Coating on Magnesium Alloy |
| Received:November 27, 2016 Revised:March 20, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2017.03.007 |
| KeyWord:Mg-Li alloy porous Zn-Ni coating corrosion resistance infrared emissivity electrical conductivity |
| Author | Institution |
| GUO Jia-cheng |
National Engineering Research Centre of Light Alloy Net Forming NERC-LAF, Shanghai Jiao Tong University, Shanghai , China |
| XU Wen-bin |
National Engineering Research Centre of Light Alloy Net Forming NERC-LAF, Shanghai Jiao Tong University, Shanghai , China |
| ZHANG Zhi-cheng |
National Engineering Research Centre of Light Alloy Net Forming NERC-LAF, Shanghai Jiao Tong University, Shanghai , China |
| NIE Le-wen |
National Engineering Research Centre of Light Alloy Net Forming NERC-LAF, Shanghai Jiao Tong University, Shanghai , China |
| GONG Lei-chao |
National Engineering Research Centre of Light Alloy Net Forming NERC-LAF, Shanghai Jiao Tong University, Shanghai , China |
| DONG Jie |
National Engineering Research Centre of Light Alloy Net Forming NERC-LAF, Shanghai Jiao Tong University, Shanghai , China |
| GUO Xing-wu |
National Engineering Research Centre of Light Alloy Net Forming NERC-LAF, Shanghai Jiao Tong University, Shanghai , China |
| DING Wen-jiang |
National Engineering Research Centre of Light Alloy Net Forming NERC-LAF, Shanghai Jiao Tong University, Shanghai , China |
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| Abstract: |
| The work aims to prepare a coating of both high electrical conductivity and infrared emissivity on Mg-Li magnesium alloy by hydrogen evolution method in order to meet the needs of thermal control and electromagnetic shielding in space. Corrosion resistance of the substrate was improved by a series of pretreatment processes (alkali cleaning→acid pick-ling→pre-passivation→electroless plating Ni-P →plating Cu), and adhesion to the following coatings was improved by plating the Cu interlayer. Porous Zn-Ni alloy coating was electrodeposited based on this pretreatment process of Mg-Li alloy. The corrosion behavior of all coatings and adhesion among them were evaluated by virtue of thermal cycle test and electrochemical method. As a result, adhesion of all the coatings completely met the technical standard applicable to satellites in space. The corrosion resistance of Ni-P coating, Cu coating and porous Zn-Ni coating was superior to that of Mg-Li alloy. The synergistic effect of these multi-layer coatings could protect the Mg-Li substrate and increase its corrosion resistance significantly. The outmost layer of porous Zn-Ni coating was composed of Ni2Zn11, NiO and NiS which shows high infrared emissivity of 0.90 and electrical resistance of ＜0.01 mΩ/cm. It can be found that the porous structure can considerably increase the infrared emissivity while maintaining high electrical conductivity of metal alloy coatings. |
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