Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


한국표면공학회지 (20권3호 118-126)

The Effect of Electrolysis Condition on the Zinc-Aluminum Composite Electro Plating

Zn-Al系 復合電氣鍍金에 미치는 電解條件의 影響

Ye, Gil-Jae;Gang, Sik-Seong;An, Deok-Su;

영남대학교 공과대학 금속과;포항제철연구소;
Dept. of Metall. Eng. Young Nam University;Pohang Steel works Researcher Laboratories;


The Zn-Al composite electroplating was studied by using chloride zinc bath containing metal hydroxides $(Zn(OH)_2,;Al(OH)_3))$ and aluminium powder. The size of Al powder codeposited in the beaker bath with Al powder of-400 mesh was under 10${mu}m$. The Zn-Al composite was electro-deposited at 40$^{circ}C$ in the ranges of current density of 5-50 A/$dm^2$ in the flowing electrolyte. The content of aluminium particles codeposited increased slightly with increasing flow rate of electrolyte from 0.5 m/sec to 1.0 m/sec, and decreased with increasing current density from 5 A/$dm^2$ to 50 A/$dm^2$. The content of aluminium particles codeposited by using the electrolyte containing zinc hydroxide(0.1M) was 2~4 wt%. The Al powder was codeposited mainly near the surface layer of the electrodeposits. The dissolution rate of aluminium particles in the electrolyte containing 0.1M $Zn(OH)_2$ and Boric acid was 0.41 g/l. day in comparison with 1.5 g/l. day dissolution rate in pure chloride bath.