Complex anticorrosion coating for ZK30 magnesium alloy
authors Lamaka, SV; Knornschild, G; Snihirova, DV; Taryba, MG; Zheludkevich, ML; Ferreira, MGS
nationality International
journal ELECTROCHIMICA ACTA
author keywords Magnesium alloy; ZK30; Sol-gel coating; Corrosion inhibitors; Spark anodizing
keywords SOL-GEL COATINGS; CORROSION PROTECTION; ALUMINUM-ALLOYS; MG-ALLOY; AA2024; PERFORMANCE; CONVERSION; MECHANISM; METALS
abstract This work aims at developing anew complex anticorrosion protection system for ZK30 magnesium alloy. This protective coating is based on an anodic oxide layer loaded with corrosion inhibitors in its pores, which is then sealed with a sol-gel hybrid polymer. The porous oxide layer is produced by spark anodizing. The sol-gel film shows good adhesion to the oxide layer as it penetrates through the pores of the anodized layer forming an additional transient oxide-sol-gel interlayer. The thickness of this complex protective coating is about 3.7-7.0 mu m. A blank oxide-sol-gel coating system or one doped with Ce3+ ions proved to be effective corrosion protection for the magnesium alloy preventing corrosion attack after exposure for a relatively long duration in an aggressive NaCl solution. The structure and the thickness of the anodized layer and the sol-gel film were characterized by scanning electron microscopy (SEM). The corrosion behaviour of the ZK30 substrates pre-treated with the complex coating was tested by electrochemical impedance spectroscopy (EIS), scanning vibrating electrode technique (SVET). and scanning ion-selective electrode techniques (SIET). (C) 2009 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2009
volume 55
issue 1
beginning page 131
ending page 141
digital object identifier (doi) 10.1016/j.electacta.2009.08.018
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000271152200017
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journal impact factor 6.215
5 year journal impact factor 5.478
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