Active corrosion protection coating for a ZE41 magnesium alloy created by combining PEO and sol-gel techniques

authors	Ivanou, DK; Yasakau, KA; Kallip, S; Lisenkov, AD; Starykevich, M; Lamaka, SV; Ferreira, MGS; Zheludkevich, ML
nationality	International
journal	RSC ADVANCES
keywords	PLASMA ELECTROLYTIC OXIDATION; AZ31 MG ALLOY; COMPOSITE COATINGS; RESISTANCE; AA2024; FILMS; IMPROVEMENT; CONVERSION; LAYER
abstract	An active protective coating for ZE41 magnesium alloy was produced by sealing an anodic layer, loaded with 1,2,4-triazole, with a sol-gel film. An anodic oxide layer was formed using PEO in a silicate-fluoride alkaline solution. This thin (1.8 mu m) porous PEO layer was impregnated with corrosion inhibitor 1,2,4-triazole and sealed with a silica-based sol-gel film modified with titanium oxide. For the first time it was demonstrated that this relatively thin PEO-based composite coating revealed high barrier properties and provided superior protection against corrosion attack during 1 month of continuous exposure to 3% NaCl. A scanning vibrating electrode technique showed a sharp decrease (100 times) of corrosion activity in micro defects formed in the 1,2,4-triazole doped composite coating, when compared to blank samples.
publisher	ROYAL SOC CHEMISTRY
issn	2046-2069
year published	2016
volume	6
issue	15
beginning page	12553
ending page	12560
digital object identifier (doi)	10.1039/c5ra22639b
web of science category	Chemistry, Multidisciplinary
subject category	Chemistry
unique article identifier	WOS:000369545800083