Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


한국표면공학회지 (52권4호 203-210)

Formation Characteristics of Hard Anodizing Films on 6xxx Aluminum Alloys

6xxx계 알루미늄 합금의 경질 아노다이징 피막 형성 특성 연구

Moon, Sanghyuck;Moon, Sungmo;Lim, Sugun;

경상대학교 재료공정융합공학과;재료연구소 표면기술연구본부;
Material Process Engineering, Gyeongsang National University;Surface Technology Division, Korea Institute of Materials Science;

DOI : 10.5695/JKISE.2019.52.4.203


In this work, anodizing behavior of 6xxx series aluminum alloys was studied under constant current density and constant voltage conditions in 20% sulfuric acid solution by V-t curves, I-t curves, thickness measurement, observations of surface appearance and cross-sectional observation of anodizing films. The film growth rate of the anodizing films on Al6063, Al6061 and Al6082 obtained at 20 V were $0.63{mu}m/min$. $0.46{mu}m/min$ and $0.38{mu}m/min$, respectively. Time to the initiation of imperfections at the oxide/substrate interface under constant current condition was shortened and colors of anodizing films became darker with the amount of alloying elements in 6xxx series aluminum alloys. Based upon the experimental results obtained in this work, it is concluded that maximum anodizing film thickness without interfacial defects is reduced with increasing amount of alloying elements and brighter anodizing films can be obtained by decreasing amount of alloying elements in the aluminum alloys.


Hard Anodizing;Anodic Oxide Film;Aluminum Alloys;Sulfuric Acid Anodizing;