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High temperature corrosion behaviour of ceramic‐based coatings on mild steel

A.U. Malik (Chemistry Section, Z. H. College of Engg. and Tech., Aligarh Muslim University, Aligarh 202 001 (India))
Sharif Ahmed (Chemistry Section, Z. H. College of Engg. and Tech., Aligarh Muslim University, Aligarh 202 001 (India))

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 1 September 1984

132

Abstract

High temperature oxidation and hot corrosion behaviour of some ceramic‐based coatings, e.g. borate, silicate‐chromate and carbide‐oxide on mild steel has been investigated in the temperature range of 400–850°C. The coated steel in general shows much better oxidation and hot corrosion resistance than the uncoated steel specially at higher temperatures. The borate coating has better hot corrosion resistance performance between 700 and 800°C whereas silicate‐chromate is suitable at temperatures above 800°C. The coated steels show parabolic behaviour during oxidation. In presence of Na2SO4, the corrosion rate increases with increasing salt concentration till a maxima is reached. The amount of Na2SO4 corresponding to the maximum corrosion rate decreases with increasing temperature. A self‐sustained fluxing cum sulphidation mechanism has been proposed to explain hot corrosion behaviour of uncoated or coated mild steel.

Citation

Malik, A.U. and Ahmed, S. (1984), "High temperature corrosion behaviour of ceramic‐based coatings on mild steel", Anti-Corrosion Methods and Materials, Vol. 31 No. 9, pp. 4-10. https://doi.org/10.1108/eb007248

Publisher

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MCB UP Ltd

Copyright © 1984, MCB UP Limited

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