Influence of Heat Treatment on the Corrosion of Carbon Steel in Environment Containing Carbon Dioxide and Acetic Acid

[摘要] Experimental investigations were carried out to study the influence of heat treatment on the corrosion behaviour of API 5L X65 pipeline steel in the presence of acetic acid HAc and carbon dioxide CO2 environment. CO2 corrosion has been recognized as one of corrosion threats resulting in a loss of pipeline integrity. In this work, the specimens taken from the X65 steel pipe were subjected to respective heat treatment which was annealing, normalizing and quenching. As-received specimens were included as control. CO2 corrosion experiments using three-electrode glass cell system were performed with and without acetic acid. Corrosion rates were measured by means of weight loss and Linear Polarization Resistance (LPR) electrochemical methods. Results showed that heat treatments were found to affect the corrosion rates. Annealed specimen showed the lowest corrosion rate while quenched specimen appeared to corrode more compared to other specimens. The presence of acetic acid in aqueous CO2 environment generally aggravated the corrosion rate for all heat-treated specimens.

[发布机构] Mechanical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh, Perak; 31750, Malaysia^1;Center for Corrosion Research, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh, Perak; 31750, Malaysia^2

[效力级别] 机械制造 [学科分类] 航空航天科学

[关键词] CO2 corrosion;Corrosion behaviour;ELectrochemical methods;Experimental investigations;Heat-treated specimens;Linear polarization resistance;Pipeline integrity;Three electrode