The oil and gas industry is facing many corrosion problems. They have been faced with contaminants such as H2S and CO2 which deteriorate pipe lines and machine components. Over time, corrosion can occur on these machines’ inner surfaces. The pipelines must transport large amounts of crude oil which must be able to withstand large amount of pressure. The storage containers for the oil and gas are made of aluminium and steel which must be protected because of their susceptibility to corrosion which impacts directly or indirectly on the economy. Steel and aluminium are important metals used from manufacture to distribution of final products in almost every part of the oil and gas industry. This paper reviews the effect of corrosion on metal and some of the approaches towards corrosion control in engineering sectors.
This article outlines the behaviour of water-soluble chitosan as an effective inhibitor on aluminium alloy in 3.65% NaCl at room temperature. The inhibitive ability of water-soluble chitosan was examined using electrochemical potentiodynamic polarization techniques, mass loss measurements and computational studies. The outcome of the experiment reveals that chitosan inhibited aluminium alloy in sodium chloride solution exhibits better corrosion protection than the uninhibited because chitosan nanoparticles minimize the ingression of chloride ion into the active sites of aluminium alloy by forming thin film on its surface. The losses in mass by the inhibited aluminium alloy were found to reduce as the concentration of chitosan increases. Results obtained showed that chitosan could offer inhibition efficiency above 70%. Polarization curve demonstrated that chitosan in 3.65% NaCl at room temperature acted as a mixed-type inhibitor. Adsorption of chitosan nanoparticles on the aluminium alloy was found to follow Langmuir adsorption isotherm with correlation regression coefficient (R2) value of 0.9961.
This article outlines the role of chitosan as a potent inhibitor on mild steel in 3.65% NaCl. The protective ability of chitosan was evaluated by potentiodynamic polarization (PP) measurements in 36.5% sodium chloride medium. The outcome of the experiment shows that mild steel in sodium chloride solution containing chitosan nanoparticles exhibit better corrosion protection than mild steel in NaCl solution alone because the anodic and cathodic site of the steel were blocked by chitosan nanoparticles, thereby minimising the incursion of the salt solution by forming a thin film on the mild steel surface. The inhibitive efficiency of chitosan nanoparticles was also studied using weight loss. The weight loss by mild steel in NaCl solution was found to be higher than those immersed in NaCl-chitosan nanoparticulate solutions. The loss in weight reduces as the concentration of chitosan nanoparticles increases, indicating the fortifying ability of chitosan nanoparticles. Results obtained show that chitosan could offer inhibition efficiency above 90%. The mixed inhibition characteristic of chitosan was demonstrated by the Tafel curve. The Langmuir isotherm possesses an R 2 value of 0.9957 indicating the effectiveness of chitosan as an inhibitor.
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