Active corrosion protection of AA2024 by sol-gel coatings with cerium molybdate nanowires

Abstract

Amorphous cerium molybdate nanowires (CMN) have been used to impart active corrosion protective properties to hybrid sol-gel coatings on AA2024. Inhibitive ability of the novel sal-gel coatings against corrosion has been studied in detail by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Localized electrochemical measurements demonstrate significant suppression of corrosion activity in micro-scale defects made in sal-gel coatings loaded with CMN when compared to blank systems. The mechanism of active protection involves release of cerium and molybdate ions from the sal-gel coating during immersion in NaCl electrolyte and their inhibiting action in corroding defects. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved