A Review of Corrosion Mechanisms and Corrosion Inhibitors in Sour Environments in the Oil and Gas Industry

This article is an overview of carbon steel corrosion and its corrosion product structure in acid medium containing H۲S and CO۲ and suitable corrosion inhibitors in this environment. Carbon steel is the main construction material for process equipment, piping system and transmission pipelines because of it’s availability and reasonable cost. However, in acidic environments, which containing H۲S gas, carbon steel corrodes at high rates, especially in multiphase flows corrodes at higher rates. The use of corrosion inhibitors is one of the logical and, from an economic point of view, cost-effective strategy to combat corrosion in these environments. In this study, the development of corrosion inhibitors in acidic environments from the past to the present, including inhibitors with mineral compounds such as sodium sulfate or organic compounds, which are divided into four general categories of inhibitors of Amine, Imidazoline, Polymeric and Gemini, has been investigated