Abstract
The adsorption of polyacrylic acid (PAAC) and polyacrylamide (PAA) (Mn = 10 4-10 6 g mol −1) on the metal (Au) and/or metal/oxide (Au/Au 2O 3; Au/FeOOH)-solution interfaces was investigated using cyclic voltammetry and double-layer capacity measurements. PAA strongly adsorbs on Au and Au/Au 2O 3 interfaces, from a neutral solution, and has a negligible influence on the Au/FeOOH-solution interface. PAAC also strongly adsorbs on Au, from acidic solutions, but shows a small influence on the Au/Au 2O 3-solution interface. The presence of PAAC in the solution and/or metal-solution interface decreases considerably the rate of the electron transfer reaction Fe 3+ Fe 2+ . This effect can be explained by a conformational behaviour of Fe(H) or Fe(III)-PAAC complex at a metal-solution interface, changing the shape of the potential energy barrier. The stability constants of such complexes depend on the polymer molecular weight and the oxidation state of Fe ions. The application of these polymers as corrosion inhibitors for iron and steel in sulphuric and hydrochloric acids shows a fairly good protection efficiency (up to 80%).
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