Molybdate-Doped Copolymer Coatings for Corrosion Prevention of Stainless Steel

摘要

The polypyrrole and polyaniline copolymer coating (PPy-PAni) and PPy-PAni doped with sodium molybdate copolymer coating (PPy-PAni-MoO~(2-)_4) were synthesized on stainless steel by cyclic voltammetry. The effect of molybdate on the passivation of stainless steel was investigated by linear sweep voltammetry in 0.2 mol L~(-1) of oxalic acid. The corrosion prevention performances of these copolymer coatings for stainless steel were investigated by linear sweep voltammetry, electrochemical impedance spectroscopy in 1 mol L~(-1) of sulfuric acid, and potentiodynamic polarization in 0.1 mol L~(-1) of hydrochloric acid. Copolymer coating doped with molybdate could accelerate the formation of the passive oxide film and have better corrosion prevention efficiencies than PPy-PAni coating on stainless steel.