Corrosion Inhibitors for Metals in an Acidic Medium
Rust and oxide layers on corroded metal are removed by the pickling process. To prevent loss of material during the pickling process, corrosion inhibitors are added. This chapter discusses inhibitors used in an acidic medium and the methods involved in corrosion inhibition studies. Many inhibitors have been used to control corrosion of various metals, such as mild steel, aluminum and its alloys, and stainless steel, in an acidic medium. To prevent corrosion of metals in an acidic medium, inhibitors like extracts of natural products, quinolline, organic inhibitors, thiourea derivatives, citric acid, triazole derivatives, and succinic acid derivatives have been used. Corrosion resistance of mild steel immersed in 1N hydrochloric acid (HCl) in the absence and presence of sodium potassium tartrate (SPT) has been evaluated by polarization studies. Corrosion resistance of mild steel immersed in 1N HCl in the absence and presence of SPT has also been evaluated by AC impedance spectra.