Oil as Corrosion Inhibitor for Aluminium Alloy in Aggressive Environment

Corrosion processes are responsible for huge losses in industry. This deterioration of components results in loss of plant efficiency, total shutdown and aggressive damage in a number of industries. Though organic, inorganic and mixed material inhibitors were used for a long time to combat corrosion, the environmental toxicity of inorganic corrosion inhibitors has prompted the search for organic corrosion inhibitors. In search for this, the use of organic inhibitors is one of the best options of protecting metals and alloys against corrosion as it is environmentally acceptable, inexpensive and readily available. In this regards, silicon oil was used as inhibitor in this study. Weight loss, corrosion rate, inhibition efficiency and potentiodynamic polarization techniques were used in this study. The aluminium alloy samples exposed to the inhibitor showed a lower corrosion rate values and excellent polarization resistance as compared with the corrosion rate samples without inhibitor. The corrosion inhibition rate increases with increasing the concentration of the silicone oil. The adsorption isotherm was confirmed by Langmuir adsorption isotherm.