| XU Gang,ZHANG Xiu-zhi,ZHANG Yi-shuai.Study on the Preparation and Properties of Ni-P/Ni Duplex Coating on the Surface Magnesium Alloys[J],39(1):71-73,80 |
| Study on the Preparation and Properties of Ni-P/Ni Duplex Coating on the Surface Magnesium Alloys |
| Received:November 03, 2009 Revised:February 10, 2010 |
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| DOI： |
| KeyWord:Duplex coating Electroless deposition Electrodeposion Ni plating Heat treatment |
| Author | Institution |
| XU Gang |
Taiyuan University of Science& Technology, Taiyuan , China |
| ZHANG Xiu-zhi |
Taiyuan University of Science& Technology, Taiyuan , China |
| ZHANG Yi-shuai |
Taiyuan University of Science& Technology, Taiyuan , China |
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| Abstract: |
| The high corrosion resistance Ni-P/Ni duplex coating was deposited on the surface of magnesium alloys by electroless depositing Ni-P and following electrodepositing Ni. The effect of electroless deposition and electrodeposition time on the corrosion resistance of the duplex coating was investigated by static corrosion immersion in the 5% NaCl aqueous solution. the results indicate that only the electroless deposition time no less then 40 min, the duplex coating get high corrosion resistance. The observations of linear sweep polarization curve experimentsindicate thatbothin the acidic solution and alkalic solution the duplex coating has good corrosion resistance.Afterheat treatment at200℃ for24 hours the corrosion resistance of the Ni-P/Ni duplex coating increases and the microhardness of the eletrodeposition exteriorNi layerincreases from HV460 to HV550. The SEM observation of the cross section of the duplex coating indicates that the coating is connected well to the magnesium substrate and there isn't obviously interface between the Ni-P layer and Ni layer. |
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