고속 경질 크롬 도금 용액 개발에 관한 연구

A study for development of high speed hard chrome plating solution

To enhancing efficiency of hard chrome plating solution more highly, cathode current efficiency were surveyed connected with hardness of deposits, surface morphology, TEM analysis and corrosion test of anode materials. Efficiency war increased up to 26% values by adding catalyst and two kind of additives. With given bath composition and 6$0^{\circ}C$, 60A/d$\m^2$ electrolosis conditionss bright and micro cracked deposits were well obtained, which showed HV 1000 values. From corrosion tests, anode materials such as Pb-Te (0.02%) and Pb-Ag(1%) showed most anti-corrosive results. Through SEM micrograph observations, ef-fects of additives on levelling, brightness and micro crack properties of hard chrome deposits could be con-firmed. Also, through TEM analysis the fact that deposits from crack free solution or high speed solution were more fine than from sargent solution could be confirmed.