| LIU Jian-hua,TAN Min,PENG Ying,LIU Shuang-yi,XIAO Li.Effects of Sol-Stearic Acid Sealing on Adhesion of Electrodeposited Zinc to Aluminium Cathodes[J],47(1):45-50 |
| Effects of Sol-Stearic Acid Sealing on Adhesion of Electrodeposited Zinc to Aluminium Cathodes |
| Received:July 27, 2017 Revised:January 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.01.008 |
| KeyWord:zinc electrodeposition surface sealing corrosion adhesion microstructure |
| Author | Institution |
| LIU Jian-hua |
a.School of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou , China |
| TAN Min |
a.School of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou , China |
| PENG Ying |
b.School of Civil Engineering, Hunan University of Technology, Zhuzhou , China |
| LIU Shuang-yi |
a.School of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou , China |
| XIAO Li |
a.School of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou , China |
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| Abstract: |
| The work aims to variation of zinc nucleation and adhesion during zinc electrodeposition by reducing adhesion of electrodeposited zinc to aluminum cathodes, which results in improvement of zinc stripping efficiency. Sol-stearic acid sealing was applied to aluminum cathodes, surface morphology of cathode surfaces and nucleation during initial zinc electrodeposition were observed with scanning electron microscope, adhesion between zinc and aluminum was tested with universal testing machine, and effects of sealed sheet on current efficiency were investigated by performing electrodeposition experiment. Micropores on the surface of sealed sheet were sealed, and the plate was smooth and flat as a whole. Nucleation rate of the sealed sheet was lower than that of common aluminum sheet. The former mainly featured in development of crystal nucleus. In addition, its bonding strength was “high in the center, and low all around”, and the adhesion increased as electrodeposition times increased. Local maximum bonding strength of the sealed sheet increased from 5.64 kg/cm2 to 6.34 kg/cm2, about 30% lower than that of common sheet, which significantly reduced difficulty of zinc stripping. Moreover, the current efficiency of sealed sheet was more stable than that of the aluminium sheets. It is practical to reduce adhesion of zinc to aluminium cathodes, reduce difficulty of zinc stripping and improve zinc stripping efficiency. |
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