Use of synergistic mixture of chelating agents for in situ LDH growth on the surface of PEO-treated AZ91

authors	Petrova, E; Serdechnova, M; Shulha, T; Lamaka, SV; Wieland, DCF; Karlova, P; Blawert, C; Starykevich, M; Zheludkevich, ML
nationality	International
journal	SCIENTIFIC REPORTS
keywords	PLASMA ELECTROLYTIC OXIDATION; LAYERED DOUBLE HYDROXIDE; HYDROTALCITE CONVERSION FILM; ACTIVE CORROSION PROTECTION; AZ31 MAGNESIUM ALLOY; MICRO-ARC OXIDATION; COATINGS; RESISTANCE; ALUMINUM; MICROSTRUCTURE
abstract	The principal possibility to grow layered double hydroxide (LDH) at ambient pressure on plasma electrolytic oxidation (PEO) treated magnesium alloy AZ91 in the presence of chelating agents is demonstrated for the first time. It avoids hydrothermal autoclave conditions, which strongly limit wide industrial application of such coating systems, and the presence of carbonate ions in the electrolyte, which lead to the formation of passive non-functionalizable LDH. A combination of chelating agents (sodium diethylenetriamine-pentaacetate (DTPA) and salicylate) were introduced to the treatment solution. The role of each additive and the influence of treatment bath composition on the LDH formation processes are discussed. A synergistic effect of DTPA and salicylate during LDH formation is discovered and its possible explanation is proposed.
publisher	NATURE PUBLISHING GROUP
issn	2045-2322
year published	2020
volume	10
issue	1
digital object identifier (doi)	10.1038/s41598-020-65396-0
web of science category	Multidisciplinary Sciences
subject category	Science & Technology - Other Topics
unique article identifier	WOS:000540471500001