In this study the influence of the iron complexes and sodium metasilicate concentrations on the microstructure, thickness and total iron content in the microplasma coatings are reported. The microplasma synthesis of iron containing coatings on A1050 aluminum alloy at the alternative current is able to be controlled by the electrolyte composition variation. The coatings were obtained in electrolytes within the range of concentrations 0-0.05 M for sodium metasilicate and 0.01-0.04 M for iron EDTA complexes. The synthesis process was studied by the analysis of the anodic and cathodic voltage-time curves behavior, chemical composition of the coatings, their thickness and phase composition. (C) 2013 Elsevier B.V. All rights reserved.