Abstract
New smart corrosion-inhibitive pigment, based on fibrous palygorskite clay (Pal), was developed. The beforehand grafted aminopropyltriethoxysilane (APTES) to Pal was used to anchor inhibitor heptanoate (C7−). In presence of C7-APTES-Pal, the electrochemical study of steel immersed in NaCl (0.1M) showed good inhibition efficiency. Corrosion products characterizations revealed an iron heptanoate protective layer at the metal surface. Impedance measurements denoted the enhancement of the corrosion protection of steel in NaCl (0.51M).These improvements can be due to the progressive release of heptanoate from Pal and to the fibrous morphology of Pal in improving the barrier properties of the polymer coating.
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