Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (51권1호 34-39)

Fracture Behavior of Fe Crucible in Molten Aluminum Coated with Al and Anodized Al

수명을 향상시키기 위해 Al 메탈 코팅과 양극산화처리된 Steel 도가니의 파괴 거동

차태민;신병현;황명원;김도형;정원섭;
Cha, Taemin;Shin, Byung-Hyun;Hwang, Myungwon;Kim, Do-Hyung;Chung, Won-Sub;

포항금속소재산업진흥원;부산대학교 재료공학과;
Pohang Institute of Metal Industry Advancement;Departments of Materials Science and Engineering, Pusan National University;

DOI : 10.5695/JKISE.2018.51.1.34

Abstract

Steel crucible used for molten Al has a problem of very limited lifetime because of the interaction between Fe and molten Al. This study was performed to improve the lifetime of steel crucible for molten Al by coating metallic Al and by further anodizing treatment to form thick and uniform anodic oxide films. The lifetime of the steel crucible was improved slightly by Al coating from 30 to 40 hours by metallic Al coating and largely to 120 hours by coating the surface with anodic oxide film. The improved lifetime was attributed to blocking of the reaction between Fe and molten Al with the help of anodic oxide layer with more than 20 um thickness on the crucible surface. The failure of the steel crucible arises from the formation of intermetallic compounds and pores at the steel/Al interface.

Keywords

Steel crucible;Fracture behavior;Al coating;Anodizing;