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Self‐healing silane coatings of cerium salt activated nanoparticles
Author(s) -
Zandi Zand R.,
Flexer V.,
De Keersmaecker M.,
Verbeken K.,
Adriaens A.
Publication year - 2016
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201508670
Subject(s) - materials science , silane , nanoparticle , dielectric spectroscopy , chemical engineering , corrosion , cerium , coating , salt spray test , cerium oxide , composite material , electrochemistry , metallurgy , nanotechnology , chemistry , electrode , oxide , engineering
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 2 ‐ZrO 2 and CeO 2 ‐SiO 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 2 ‐ZrO 2 nanoparticles. The corrosion behavior of the sol‐gel coatings was 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 2 ‐ZrO 2 nanoparticles. Incorporation of activated CeO 2 ‐ZrO 2 nanoparticles reduces the cathodic and anodic current density by one order of magnitude and shifts the corrosion potential to more positive values compared with the coating containing CeO 2 ‐SiO 2 nanoparticles. Also, the EIS test results revealed higher impedance for the coating containing activated CeO 2 ‐ZrO 2 nanoparticles. Corrosion tests results suggest that the activated CeO 2 ‐ZrO 2 nanoparticles are more effective as nano‐structured cerium ion reservoirs and can provide prolonged release of the inhibitor ions.