Effect of Metallic Cations on Corrosion Inhibition of an Anionic Surfactant for Mild Steel Available to Purchase

The effect of metallic cations such as Cu²⁺, Ni²⁺, and La³⁺ on corrosion inhibition of the anionic surfactant of cold-rolled mild steel (MS) in hydrochloric acid (HCl) by sodium dodecyl sulfonate (SDS) was investigated using the weight-loss method. A marked inhibition synergism of Cu²⁺ and SDS was found. Accelerated corrosion occurred in a lower concentration range of La³⁺, but a powerful inhibition synergism appeared at a special concentration range for the mixture of La³⁺ and SDS. The effect of Ni²⁺ was minor. Results were evaluated in light of adsorption theory.