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Acta Metall Sin  2008, Vol. 44 Issue (6): 751-756     DOI:
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THE EFFECT OF MECHANICAL ATTRITION ON THE GRAIN GROWTH OF ELECTRODEPOSOTION Ni COATINGS
;
北京科技大学
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Abstract  The mechanical attrition (MA) action was supplied in a traditional electroplating process by the vertical movement of glass balls on the sample surface with a special vibrating frequency. The effect of vibrating frequency and the diameter of glass balls on the grain refinement were observed. The effect of MA on grain growth was also studied. It is demonstrated from FESEM results that the new coating shows smooth and refinement surface morphology by supplying MA. The further studies showed that the grain refinement and slow grain growth could be obtained by supplying MA. The nucleation of new grains increased with the increasing the macro and micro defects on the surface of coating induced by MA. The deposited atom was forced to slide to valley when the glass balls bumped on big grains, which made the coating surface smooth. The uniformity current line could be obtained on the smooth surface, which can increase the nucleation rate and hinder the grain growth.
Key words:  mechanical attrition      electrodeposition      Ni coating      
Received:  05 November 2007     
ZTFLH:  TQ153  
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;. THE EFFECT OF MECHANICAL ATTRITION ON THE GRAIN GROWTH OF ELECTRODEPOSOTION Ni COATINGS. Acta Metall Sin, 2008, 44(6): 751-756 .

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https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2008/V44/I6/751

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