Self-healing silane coatings of cerium salt activated nanoparticles

ROOHANGIZ ZANDI ZAND; VICTORIA FLEXER; MICHEL DE KEERSMAECKER; VERBEKEN, K.; ADRIAENS, A.

MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION

WILEY-V C H VERLAG GMBH

Lugar: Weinheim; Año: 2016 vol. 67 p. 693 - 701

0947-5117

This work investigates the effect of cerium salt activated nanoparticles as nanoreservoirs on the self-healing properties of silane hybrid coatings deposited on electro-galvanized steel substrates. The substrates were pre- treated with 3?glycidoxypropyl-trimethoxysilane (GPTMS) and bisphenol A (BPA), modified with cerium ion-activated CeO -ZrO and CeO -SiO 2 2 2 2 nanoparticles. The morphology of the coating before corrosion tests was examined using atomic force microscopy (AFM). The results indicate the formation of nanostructured surfaces with relatively uniform dispersion of nanoparticles in the silane coating containing CeO -ZrO nanoparticles. The 2 2 corrosion behavior of the sol-gel coatingswas also investigated using salt spray tests, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization tests. During the salt spray test, the samples are exposed 600 h (or 25 days), revealing the improved resistance of the coated substrate containing CeO -ZrO nanoparticles. Incorporation of activated CeO -ZrO nanoparticles 2 2 2 2 reduces the cathodic and anodic current density by one order ofmagnitude and shifts the corrosion potential to more positive values compared with the coating containing CeO -SiO nanoparticles. Also, the EIS test results revealed 2 2 higher impedance for the coating containing activated CeO -ZrO 2 2 nanoparticles. Corrosion tests results suggest that the activated CeO -ZrO 2 2 nanoparticles are more effective as nano-structured cerium ion reservoirs and can provide prolonged release of the inhibitor ions