Corrosion Resistance of Chromium Carbide Coatings in Oxygen-Sulfur Environments

摘要

Oxidation of metallic materials at elevated temperatures in bioxidant environments is a potential problem in many systems within the chemical, petroleum, and power-generating industries. The use of appropriate corrosion-resistant coatings on metallic components offers an avenue to minimize the material degradation and to extend the life of the component. The present paper discusses results obtained on the performance of chromium carbide and chromium coatings on a Type 310 stainless steel (SS) substrate exposed to oxidizing and sulfidizing gas mixtures. The coatings were developed by an electro-spark deposition (ESD) process in which duration, high-current electrical pulses were used to deposit the electrode material on the metallic substrate. This paper presents thermogravimetric test data, observations on the morphology of coating layers, and hardness depth profiles for coated and uncoated specimens after exposure to several gas mixtures at test temperatures of 875 and 650 deg. 0 C. (ERA citation 12:037209)