Sol Gel coating containing silica nanoparticles and cerium salts on carbon steel

IANINA, SANTANA; SILVIA, CERÉ; ANDRÉS, PEPE

Niza

Congreso; 61er encuentro anual del International Society of Electrochemistry; 2010

International Society of Electrochemistry

SOL GEL COATING CONTAINING SILICA NANOPARTICLES AND CERIUM SALTS ON CARBON STEEL   Ianina C. Santana, Andrés Pepe, Silvia Ceré*   INTEMA- Universidad Nacional de Mar del Plata- Buenos Aires-Argentina- smcere@fi.mdp.edu.ar                 Carbon steel are widely used in industry, however their susceptibility to corrosion limits its applications. One strategy to minimize the corrosive attack is the application of coatings with rare earth (RE) salts as a valid alternative owing to its low toxicity and environmental feasibility. The RE are employed to replace chromate treatments due their high toxicity which tends to their total elimination in the industry.             Sol gel process is a chemical method that allows the synthesis of glass and ceramic materials at temperatures much lower than the conventional methods and can be used to obtain coating which, in turn, may be functionalized.             This work evaluates the electrochemical behavior of carbon steel coated by sol-gel method. Hybrid organic-inorganic silica sol-gel coatings were obtained by dip coating in an organically modified silica sol made from hydrolysis of 3-glicidoxipropyltrimetoxisilano (GPTMS) and tetra-orthosilicate (TEOS) as precursors in acidic catalysis. The coatings were doped with cerium salts (Ce(NO3)3) and loaded with silica nanoparticles for improving the corrosion resistance of the coatings both by the inhibitory effect of the salt and  by increasing the barrier effect. The coatings were obtained by dip coating onto AISI 1010 carbon steel, producing a two-layer equally distributed homogeneous film without cracking. The corrosion behavior of the coated samples was characterized by electrochemical tests with various immersion times in NaCl 0.35%m/v.   Keywords: corrosion- sol-gel- cerium salts- carbon steel