Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (32권3호 440-443)

CRYSTAL TRANSITION PROCESS DURING POST-BREAKDOWN IN THE MOLTEN SALT


Han, S.H.;Thompson, G.E.;


Cleaner Production Centre, Korea Institute of Industrial Technology;Corrosion and Protection Centre, University of Manchester Institute of Science and Technology;

Abstract

The morphology and composition of anodic films, formed on aluminium at various current densities, in the range 1-$100{;}Am^{-2}$, in the molten bisulphate melt at different temperatures (418-498K), have been studied using transmission electron microscopy of ultramicrotomed film sections, and ion beam thinned films. From the structural analysis of the electron diffraction patterns taken from the ultramicrotomed sections and ion beam thinned films, it can be concluded that the crystal modification process from ${gamma}-Al_2O_3{;}to{;}{alpha}-Al_2O_3$ proceeds in the following steps : (equation omitted)

Keywords

Anodic oxidation;Post breakdown;Molten salt;Crystal transition;Aluminum;