| LIU Qiu-yue,ZHANG Xiu-qing,PU Hai-zhou,XU Jin-peng.Study on the Preparation and Properties of Ni-P / Ni-Sn-P Duplex Coatings on AZ91D Magnesium Alloy[J],44(2):34-37,133 |
| Study on the Preparation and Properties of Ni-P / Ni-Sn-P Duplex Coatings on AZ91D Magnesium Alloy |
| Received:October 20, 2014 Revised:February 20, 2015 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.02.007 |
| KeyWord:AZ91D magnesium alloy Ni-P coating Ni-P / Ni-Sn-P duplex coatings corrosion resistance |
| Author | Institution |
| LIU Qiu-yue |
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai , China |
| ZHANG Xiu-qing |
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai , China |
| PU Hai-zhou |
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai , China |
| XU Jin-peng |
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To improve the corrosion resistance of AZ91D magnesium alloy and expand the range of application. Methods Ni-P coating was first prepared on AZ91D magnesium alloy by electroless plating, then Ni-Sn-P coating was prepared on this basis, forming Ni-P/ Ni-Sn-P duplex coatings. The microstructure and corrosion resistance of Ni-P/ Ni-Sn-P duplex coatings were investigated and compared with those of Ni-P coating. Results The results showed that the surface of Ni-P/ Ni-Sn-P duplex coatings was more uniform, compact, with fewer defects, lower porosity and amorphous structure. The corrosion potential of the secondary Ni-Sn-P coating was about -0. 77 V, which was lower than that of the first Ni-P coating ( -0. 68 V). The potential difference between the two coatings formed micro etching point, with Ni-P coating as the cathode, and Ni-Sn-P coating as the anode, and the anode was corroded first. Conclusion The outer layer of Ni-Sn-P coating in the Ni-P/ Ni-Sn-P duplex coatings could protect the first Ni-P coating from corroding and diffuse the corrosion current in the horizontal direction, thus greatly enhancing the corrosion resistance of AZ91D magnesium alloy. |
| Close |
|
|
|