Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


한국표면공학회지 (14권1호 5-9)

The effects of Si-content on the corrosion rate of Cu-al alloys

동일 알루미늄 합금의 탄식속도에 미치는 규소의 영향

Ham, Dong-Ha;Kang, Tak;Kang, Choon-Sik;

서울대학교 대학원 금속공학과;서울대학교 공과대학;
College of Engineering, Seoul National University;


The effects of silicon content on the corrosion rates of Cu-7wt% Al alloys have been investigated by the use of electrochemical methods. The corrosion current densities of the alloys are decreased with the addition of Si up to 2wt%, and the slightly increased at 2.5%Si. This increased corrosion rates are attributed to the precipitation of more anodic gamma-2 phase. The X-ray diffraction tests reveal the dealuminumification of these alloys and mixtures of CuCl and Al2O3 formed on the surface of the specimens, which are considered to passivate the alloys at noble potentials.