Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


공학

한국표면공학회지 (26권4호 183-191)

A Study on Metalliding of Al on Steel from Molten Fluorides

불화물계 용융염중에서 Steel 기지 소재의 Al 전해피복에 관한 연구

이민구;서길원;백영현;
;;;

고려대학교 금속공학과;한국과학기술연구원;
고려대학교 금속공학과;한국과학기술연구원;

Abstract

Diffusion coating(metalliding) of aluminium on steel from molten fluorides(29.2wt.% LiF-11.7wt.% NaF-59.1wt.% KF, FLINAK) was studied. The electrolytic cell consists of a steel cathode and a consumable aluminium anode. Effects of manganese on the aluminium deposition were also investigated. The quality of the deposit was analyzed by SEM, OM, EPMA, EDXA, and also examined by means of Micro-Vickers hardness and corrosion tests. Deposit layer was identified as an aluminium-rich iron alloy caused by diffusion process. The optimum condition for the metalliding was found to be the current density, 50 to $150mA/ extrm{cm}^2$, the bath tem-perature, $57.5^{circ}C$, and the amount of AlF3, 10wt.%. Addition of manganese fluoride (up to 5wt.%) as a co-de-posit element improved significantly the quality of the deposit layer.

Keywords