EFFECT OF INTRODUCTION OF CO2 ON THE FORMATION OF BIOFILMS/BIOCORROSION ON AISI 1018 CARBON STEEL SURFACES EXPOSED IN A DYNAMIC SYSTEM

摘要

Biofilms are microorganism communities immobilized together in an extracellular polymeric substance (EPS) matrix of microbial origin,and represent the majority of microbial life in terms of quantity and activity. Biofilms are typically composed of water,microorganisms,EPS,retained particles,and dissolved or adsorbed substances. Sessile microorganisms accelerate various reactions during electrochemical corrosion of materials. The corrosion process of metals exposed to seawater is characterized by different factors such as temperature,salinity,oxygen concentration,carbon dioxide (CO2),hydrogen sulfide (H2S),and microorganisms. The oil and gas industries are expending significant investment in materials,equipment,and monitoring to control biocorrosion in order to avoid accidents with large impacts on marine ecosystems. Moreover,the industry also studies the operation of oil well pressurization through CO2 injection,and corrosion by this compound has been studied by many authors in order to explain the reaction and electrochemical mechanisms. The purpose of this work was to evaluate the effect of the introduction of CO2 on the formation of biofilm/biocorrosion in AISI 1018 carbon steel exposed to a dynamic system.