| GUAN Xiu-rong,ZHU Hong-da,SHI Jing-wei,SHAO Zhong-cai,DAI Shi-hang.The Influence of Zinc-dipping Pretreatment Technological Conditions on the Electroless Nickel Coating on Magnesium Alloy[J],47(4):140-144 |
| The Influence of Zinc-dipping Pretreatment Technological Conditions on the Electroless Nickel Coating on Magnesium Alloy |
| Received:October 30, 2017 Revised:April 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.04.021 |
| KeyWord:magnesium alloy zinc dipping pretreatment electroless nickel plating malic acid |
| Author | Institution |
| GUAN Xiu-rong |
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang , China |
| ZHU Hong-da |
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang , China |
| SHI Jing-wei |
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang , China |
| SHAO Zhong-cai |
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang , China |
| DAI Shi-hang |
School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang , China |
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| Abstract: |
| The work aims to optimize the complexing agent of zinc-dipping pretreatment solution before zinc-dipping and the process conditions of zinc-dipping pretreatment. The main method is, studying zinc-dipping complexing agent before processing, determined the best complexing agent, and under the best conditions, studying the influence of pH value and temperature in the former treatment solution on the electroless nickel plating layer. The corrosion resistance of electroless nickel coating was evaluated by electrochemical test, scanning electron microscope (SEM) and X ray diffraction (XRD). The best complexing agent and technological conditions were determined. Through the measurement and SEM observation of the microstructure of nickel plating layer thickness, to determine the optimal complexing agent is malic acid; In this condition to determine the optimal processing conditions is pH=10, temperature is 80 ℃, the electroless nickel plating layer of the corrosion potential is 0.6 V, compared with the corrosion potential of magnesium alloy substrate potential 1.47 V, improved 0.87 V, the corrosion current decreased from 1.26×104 A/cm2 to 1.26×106 A/cm2, the corrosion current density is reduced by 2 orders of , the passivation interval of the coating was 0.6~0.2 V, plating layer with good adhesion, beautiful appearance. In conclusion, the optimum complexing agent for the pretreatment solution of magnesium alloy is malic acid. The optimum technological conditions are pH=10 and temperature 80 ℃. |
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