Corrosion Inhibition by Thermal Polyaspartate.

摘要

Polyanhydroaspartic acid, synthesized by thermal condensation of L-aspartic acid at 190 deg C for 24 to 96 hours and converted to polyaspartate by mild alkaline hydrolysis, was evaluated as an inhibitor of corrosion. Inhibitor efficiency was judged on mild steel coupons exposed to salt water by visual inspection and by electrochemical testing. Electrochemical potential, polarization resistance and impedance spectra were evaluated. The mild steel surfaces were also examined using scanning electron microscopy/energy-dispersive x-ray spectrometry (SEM/EDAX) before and after exposure. The results indicated that thermal polyaspartate binds to surfaces of mild steel and moderately suppresses both anodic and cathodic corrosion reactions.