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DLC Coatings in High-Temperature Hydrogen Sulfide Environment

Picture for DLC Coatings in High-Temperature Hydrogen Sulfide Environment
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Product Number: 51315-5993-SG
ISBN: 5993 2015 CP
Author: Tomasz Liskiewicz
Publication Date: 2015
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Surface protection in high temperature hydrogen sulfide environment remains a significant challenge with limited number of materials providing adequate protection. Diamond-like carbon (DLC) thin films are recognized across different sectors as a promising way of controlling wear and the corrosion performance of components. The aim of this paper is to test the hypothesis that DLC coatings may act as an efficient corrosion barrier for steel components in high temperature hydrogen sulfide environment. Three types of DLC coatings were deposited in this work using Plasma-Enhanced Chemical Vapor Deposition (PECVD) process and the coatings were characterized in terms of their structure morphology and mechanical properties. Coated test coupons were exposed to high pressure autoclave tests simulating sour production environments for the period of 30 days. AC Impedance Spectroscopy was used to examine the permeability of DLC coatings before and after autoclave exposure. Value of resistance and capacitance for three coatings was determined through modeling of the electrochemical data. The results were used to correlate the corrosion protection properties of coatings in high temperature hydrogen sulfide environment with their structure and composition.
Surface protection in high temperature hydrogen sulfide environment remains a significant challenge with limited number of materials providing adequate protection. Diamond-like carbon (DLC) thin films are recognized across different sectors as a promising way of controlling wear and the corrosion performance of components. The aim of this paper is to test the hypothesis that DLC coatings may act as an efficient corrosion barrier for steel components in high temperature hydrogen sulfide environment. Three types of DLC coatings were deposited in this work using Plasma-Enhanced Chemical Vapor Deposition (PECVD) process and the coatings were characterized in terms of their structure morphology and mechanical properties. Coated test coupons were exposed to high pressure autoclave tests simulating sour production environments for the period of 30 days. AC Impedance Spectroscopy was used to examine the permeability of DLC coatings before and after autoclave exposure. Value of resistance and capacitance for three coatings was determined through modeling of the electrochemical data. The results were used to correlate the corrosion protection properties of coatings in high temperature hydrogen sulfide environment with their structure and composition.
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