Jornal de Metalurgia do Pó e Mineração

Abstrato

Corrosion Protection of Stainless Steel by Organic Inhibitors in Phosphate Industries in 15% H₂SO₄

Singh RK* and Kumar R

Phosphate industries use sulphuric acid during the manufacturing of fertilizers. This acid interacts with stainless steel to develop corrosion cell and it corrodes metal. Organic inhibitors 2-(aminomethyl) phenol and 2-(aminomethyl) benzenethiol were taken for corrosion control in 15% H2SO4 medium. Inhibitors anticorrosive effect studied at different temperatures and 10 mM concentration. The corrosion rate of metal absence and presence of inhibitors were determined gravimetric methods. The corrosion current density and inhibitors polarization effect was studied by potentiostat. Inhibitors’ corrosion protection activities like physisorption-chemisorption adsorption, thermal stability and surface films formation analysis can be done by activation energy, heat of adsorption, free energy, enthalpy and entropy. The experimental results of inhibitors surface coverage area and inhibition efficiency were exhibited strong bonding between inhibitors and base metal.