Cerium (III) Oxide – Based Conversion Layer on Galvanized Steel: Preparation and Inhibition Properties Characterization
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This study presents inhibitive protection of commercial cerium (III) oxide (Ce2O3) for a galvanized steel substrate in a corrosive solution. Electrochemical measurements revealed that Ce2O3 at a small content (0.05 wt%) had an inhibitor capacity by forming a protective layer after a short immersion. The morphology and growth of the Ce-rich passive film were subjected to field-emission scanning electronic microscopy (FE-SEM) and x-ray diffraction (XRD) analysis. Results showed round-shaped crystals mainly composed of zincite, simonkolleite, and cerium carbonate. Polarization curves confirmed the inhibitory action of Ce2O3 as a cathodic inhibitor. The cerium (III) oxide was then used as the main composition to prepare a cerium-based conversion layer on a galvanized steel substrate, presenting a homogenous and crystal-shape structure revealed by FE-SEM and EDS analysis. This cerium pretreatment layer can help reinforce the adhesion performance (approved by ASTM D4541 pull-off test standard) and anti-corrosion properties (approved by ASTM B117 salt spray test standard) between the epoxy layer and the galvanized steel substrate.
Abstract
This study presents inhibitive protection of commercial cerium (III) oxide (Ce2O3) for a galvanized steel substrate in a corrosive solution. Electrochemical measurements revealed that Ce2O3 at a small content (0.05 wt%) had an inhibitor capacity by forming a protective layer after a short immersion. The morphology and growth of the Ce-rich passive film were subjected to field-emission scanning electronic microscopy (FE-SEM) and x-ray diffraction (XRD) analysis. Results showed round-shaped crystals mainly composed of zincite, simonkolleite, and cerium carbonate. Polarization curves confirmed the inhibitory action of Ce2O3 as a cathodic inhibitor. The cerium (III) oxide was then used as the main composition to prepare a cerium-based conversion layer on a galvanized steel substrate, presenting a homogenous and crystal-shape structure revealed by FE-SEM and EDS analysis. This cerium pretreatment layer can help reinforce the adhesion performance (approved by ASTM D4541 pull-off test standard) and anti-corrosion properties (approved by ASTM B117 salt spray test standard) between the epoxy layer and the galvanized steel substrate.