| ZHAO Dan,YANG Li-gen,XU Xu-zhong.Deposition Behavior and Mechanism of Electroless Plating Ni-Zn-P Alloy Coating on Low-carbon Steel Surface[J],45(1):69-74,95 |
| Deposition Behavior and Mechanism of Electroless Plating Ni-Zn-P Alloy Coating on Low-carbon Steel Surface |
| Received:September 17, 2015 Revised:January 20, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.01.011 |
| KeyWord:low-carbon steel alkaline electroless plating Ni-Zn-P alloy coating microstructure morphology coating composition deposition mechanism |
| Author | Institution |
| ZHAO Dan |
North China University of Science and Technology, Tangshan , China |
| YANG Li-gen |
North China University of Science and Technology, Tangshan , China |
| XU Xu-zhong |
North China University of Science and Technology, Tangshan , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To further understand chemical plating Ni-Zn-P by studying on deposition behavior and mechanism of alkaline electroless plating Ni-Zn-P alloy coating on low-carbon steel surface. Methods The Ni-Zn-P alloy coatings were prepared on Q235 steel by alkaline electroless plating technique and changing the application time. The morphology of coating surface and cross section was observed by SEM, and the composition of coating surface and cross section was analyzed by EDS. Results The deposition process of Ni-Zn-P alloy coating was that the atomic group formed on solid liquid interface → preferential deposition of atomic group on regions with higher energy → atomic group accumulation → extending to the surrounding → covering the entire matrix → forming complete coating → uniform growth. The surface composition detection results of Ni-Zn-P alloy coating were obtained. Firstly, the element Ni was detected in after plating for 1 ~ 3 s and the maximum amount 75. 93wt% occurred on the surface within 3 min, since then it was maintained stable. Secondly, the element P was detected after plating for 1 min, and then the P percentage gradually increased with prolonging plating time, and the maximum amount 12. 03wt% was reached at 30 min, after that it was maintained stable. Finally, Zn was detected at 5 min and the deposition amount was 4. 18 wt% on the surface, since then there was little change in deposition amount. The results of component analysis showed that the deposition process of Ni-Zn-P alloy coating was preferential deposition of Ni, followed by co-deposition of Ni and P, and finally co-deposition of Ni, P and Zn to form a continuous and dense coating. Based on Nernst equation, ENi2+ / Ni = -0. 337 V and EZn2+ / Zn = -0. 906 V. The alloy co-deposition electroless plating could not occur due to the big difference between the two deposition potentials. Conclusion The deposition mechanism of Ni-Zn-P alloy coating was believed to be catalytic reduction reaction, namely Zn co-deposition induced by nickel reduction. |
| Close |
|
|
|