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Under Deposit Corrosion of API X-65 Carbon Steel in the Presence of Acid Gases

Deposits can play an important role in the corrosion rate and morphology of carbon steel in a production environment as well as affect the efficacy of an inhibitor. A test method has been developed to investigate the corrosion characteristics of carbon steel in a stratified flow regime where deposits of solids accumulate in the bottom of a pipeline.Previous testing showed higher under deposit corrosion rates of API X-65 carbon steel when the deposit consists of iron sulfide (FeS) versus sand in a 100%H 2 S environment. There is a needto investigate the effect of CO2 on these findings as the lower pH should affect the corrosion rate morphology and galvanic action particularly with respect to the FeS deposits.This paper presents the effect of mixed gases (50%H 2 S + 50%CO2 ) on corrosion behavior of API X-65 carbon steel coupons in the FeS and sand deposits. The average corrosion rate thickness loss of the coupons and pitting at the solid/liquid interface will be presented.Keywords: Under deposit corrosion Iron sulfide (FeS) sand mill scale acid gases

Product Number: 51319-13044-SG
Author: Suresh Divi
Publication Date: 2019
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