Fabrication of (Mn_xCo_(1-x))_3O_4 Coated Stainless Steel AISI 430 by Electrodeposition with AC+DC Signals

摘要

A ferritic stainless steel (FSS) AISI 430 coated by (Mn_xCo_(1-x))_3O_4 spinel has been intensively studied for its potential in application as an interconnect of a solid oxide fuel cell (SOFC). In this study, in order to develop fabrication of (Mn_xCo_(1-x))_3O_4 coatings, Mn-Co coatings on AISI 430 by an electrodeposition technique was adopted. The electric direct current (DC) and alternative current (AC) modulated DC (AC+DC) signals were utilized to drive voltage levels for electrodeposition. By varying the duty of the AC+DC signals from 25 % to 50 %, the ratio of Mn and Co composition in the coating changed, consequently by this technique it is possible to adjust the composition of binary alloy coating. The fabricated coatings also exhibited different morphologies indicating nucleation and grain growth process of various oxide scales of Mn-Co. The oxidation behavior is also investigated to evaluate the quality of the coatings.