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Title

INFLUENCE OF SINGLE WALLED CARBON NANOTUBE ADDITION ON THE ZINC-RICH PAINT COATING CORROSION IN NACL SOLUTION

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Abstract

ZINC-RICH PAINTS (ZRPS) ARE ONE OF THE MOST EFFECTIVE COATINGS USED TO PROTECT STEEL FROM CORROSION [1]. THEY ARE USED IN MANY AGGRESSIVE MEDIUM: SEA WATER, MARINE AND INDUSTRIAL ENVIRONMENTS. FOR SOLVENT-BASED ZINC-RICH PAINTS, IT SEEMS TO BE ESTABLISHED THAT, AT LEAST AT THE BEGINNING OF IMMERSION, ZINC PARTICLES PROVIDE A CATHODIC PROTECTION OF THE STEEL SUBSTRATE [1, 2]. THEN, A LONG TERM PROTECTION DEVELOPS DUE TO THE FORMATION OF ZINC CORROSION PRODUCTS, REINFORCING THE BARRIER AFFECT OF THE PAINT [1, 3].THE EFFECT OF ADDITION OF CONDUCTIVE PIGMENTS LIKE SINGLE WALLED CARBON NANOTUBES ON THE CORROSION BEHAVIOR OF ZINC-RICH PAINTS (ZRP) COATED STEEL IN 3.5% NACL SOLUTION WAS INVESTIGATED. OPEN CIRCUIT POTENTIAL MEASUREMENTS WERE USED TO CHARACTERIZE THE CATHODIC PROTECTION ABILITY AND DURATION. ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY AND TAFEL ANALYSIS WAS PERFORMED IN ORDER TO IDENTIFY THE CORROSION RATE AND TO FOLLOW THE CORROSION MECHANISM. ALSO, THE SCANNING ELECTRON MICROSCOPE (SEM) ANALYSIS WAS USED FOR STUDY THE MORPHOLOGY CHANGES IN THE COATING DUE TO CORROSION. TWO DIFFERENT EFFECTS WERE POINTED OUT: INCREASE OF THE POROSITY INDUCED BY SINGLE WALLED CARBON NANOTUBES ADDITION AND A GALVANIC ACTION BETWEEN ZINC AND SINGLE WALLED CARBON NANOTUBES.

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