- 수산을 사용한 크롬도금의 광택성에 미치는 전류밀도와 전류효율의 영향
- ㆍ 저자명
- 오이식,박정덕,Oh. L.S.,Park. J.D.
- ㆍ 간행물명
- 한국동력기계공학회지
- ㆍ 권/호정보
- 2001년|5권 1호|pp.89-96 (8 pages)
- ㆍ 발행정보
- 한국동력기계공학회
- ㆍ 파일정보
- 정기간행물| PDF텍스트
- ㆍ 주제분야
- 기타
Decorative property of chromium deposition from oxalic acid bath containing chromium oxide and ammonium sulfate, has been examined over a wide range of bath compositions and plating conditions. The followings were determined as optimum bath composition, $CrO_3;200{sim}250g/{ell},;H_2C_2O_4{cdot}2H_2O;500{sim}700g/{ell},;(NH_4){_2}SO_4;40{sim}120g/{ell}$, and operation conditions; pH $2.0{sim}2.5$, current density of $15{sim}250Adm^2 $ at the bath temperatures of $30{sim}80^{circ}C$. Bright chromium deposits were obtained over a wide range of ammonium sulfate concentration, bath temperature, and current density. The current efficiency decreased with increasing current density and bath pH, and increased with Increasing bath temperature. The highest current efficiency was obtained in the bath containing $80g/{ell}$ of ammonium sulfate. Bright chromium deposits were not obtained at conditions of all the highest current efficiencies.