Green synthesis of polydopamine-modified attapulgite: a sustainable solution for mitigating carbon steel corrosion in amino-sulfonic acid-laden environments

Abstract

Poly-dopamine was grafted onto attapulgite via in situ polymerization to synthesize PDA/ATP composites as a green corrosion inhibitor during aminosulfonic acid pickling. Attapulgite's high surface area offered abundant sites for poly-dopamine adsorption. Corrosion inhibition efficiency increased with concentration, reaching 92.21% at 100 mg L⁻¹, demonstrating cathodic-type inhibition. Quantum chemical calculations confirmed the superior corrosion inhibition properties. This study provides new insights into eco-friendly applications of ATP-based inhibitors, highlighting their potential for sustainable metal protection. The synergistic interface design enhances inhibitor stability and active site accessibility in acidic environments.