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Mechanistic Studies of Sour Underdeposit Corrosion in the Presence of Chemical Inhibition

Picture for Mechanistic Studies of Sour Underdeposit Corrosion in the Presence of Chemical Inhibition
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Product Number: 51315-6004-SG
ISBN: 6004 2015 CP
Author: Zhengwei Liu
Publication Date: 2015
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Failure of steel materials in sour environments is of great importance in the oil and gas industry. The iron sulfide deposits created from steel corrosion in the presence of H2S complicate the corrosion failure mechanism and the ability to inhibit those mechanisms. Iron sulfide films decrease the general corrosion rate but introduce higher occurrences of pitting corrosion. Most sour failures in the field are due to pitting or underdeposit corrosion. Pitting and underdeposit corrosion are more difficult to monitor and inhibit. Several studies have been conducted describing the bulk behavior of sour corrosion with and without chemical addition in the presence of underdeposit corrosion. However little information exists on the sub-mechanisms involved in the underdeposit corrosion process in the presence of chemicals. The inhibition performance could be significantly affected by three main sub-mechanisms each having variable contribution to the overall mechanistic process 1) diffusion through the porous deposit film 2) adsorption on the steel anode surface and 3) adsorption on the iron sulfide cathode surface. This paper explores the contribution of each of these sub-mechanisms to the inhibition of the underdeposit corrosion process. It also studies the effect of various corrosion inhibitors on each sub-mechanism. The experimental procedure used in this investigation will include galvanic coupling of a mild steel electrode to an electrode made from solid iron sulfide. The data collected will be used to quantitatively analyze the individual effects on chemical inhibition from diffusion adsorption onto the iron surface as well as adsorption onto the iron sulfide surface.
Failure of steel materials in sour environments is of great importance in the oil and gas industry. The iron sulfide deposits created from steel corrosion in the presence of H2S complicate the corrosion failure mechanism and the ability to inhibit those mechanisms. Iron sulfide films decrease the general corrosion rate but introduce higher occurrences of pitting corrosion. Most sour failures in the field are due to pitting or underdeposit corrosion. Pitting and underdeposit corrosion are more difficult to monitor and inhibit. Several studies have been conducted describing the bulk behavior of sour corrosion with and without chemical addition in the presence of underdeposit corrosion. However little information exists on the sub-mechanisms involved in the underdeposit corrosion process in the presence of chemicals. The inhibition performance could be significantly affected by three main sub-mechanisms each having variable contribution to the overall mechanistic process 1) diffusion through the porous deposit film 2) adsorption on the steel anode surface and 3) adsorption on the iron sulfide cathode surface. This paper explores the contribution of each of these sub-mechanisms to the inhibition of the underdeposit corrosion process. It also studies the effect of various corrosion inhibitors on each sub-mechanism. The experimental procedure used in this investigation will include galvanic coupling of a mild steel electrode to an electrode made from solid iron sulfide. The data collected will be used to quantitatively analyze the individual effects on chemical inhibition from diffusion adsorption onto the iron surface as well as adsorption onto the iron sulfide surface.
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