Investigation of PASP as an eco-friendly polymer developed to act as an anodic corrosion inhibitor.

What is it about?

Corrosion inhibition mechanism of Polyaspartic acid (PASP) as eco-friendly polymer on mild steel in aerated 3% NaCl solution was investigated utilizing electrochemical, thermodynamic, microscopic and computational chemistry techniques. Electrochemical results confirm moderate inhibition efficiency of PASP reaching 61% at 2.0 g/L by forming an adsorption layer on metal surface. Zinc ion addition enhanced the efficiency to 97% at 0.5 g/L of PASP through a synergistic effect mechanism. Scanning electronic microscopy (SEM) and Atomic force microscopy (AFM) micrographs revealed the morphology of adsorption layer indicates anodic inhibition mechanism of PASP. Quantum calculation and Monte Carlo simulation provided molecular level insights into the adsorption mechanism of PASP on steel surface which were consistent to the experimental findings.

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Why is it important?

PASP is an eco-friendly polymer developed to act as an anodic corrosion inhibitor. Zinc ions synergized the performance of PASP reaching superior corrosion inhibition. Quantum calculations elucidated the corrosion inhibitive molecular properties of PASP. Monte Carlo simulation findings are consistent with experimental results.