Formation of Manganese-Containing PEO Coatings on Aluminum Alloys
This chapter introduces the investigation of Al alloys plasma electrolytic oxidizing (PEO) and analysis of process characteristics. The research directs to set regularity of electrochemical obtaining (forming or formation) of nanostructured coatings mono-
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Increasing the complexity, accuracy, reliability, and versatility of technical devices and their elements requires the widespread use of functional coatings for various purposes. The development of eco-friendly novel and original technologies for the producing of coatings with a wide range of functional properties on metal carriers is today one of the urgent tasks [1, 2]. This is due to the toughening of operating conditions and aggressiveness of the applied technological environments, as well as a general increase in the requirements for the used structural materials. Plasma electrolytic oxidizing (PEO) provides coatings similar to ceramic [3]. Such systems have a unique complex of properties, in particular catalytic, wear-, heat- and corrosionresistant, and electrical insulating [4, 5]. A PEO feature is the possibilities of implementing in one process both material surface treatment procedure and the synthesis of oxide coatings. Obtained oxide layer may include metals from the processing substrate as well as the electrolyte components derivatives, and the resulting coatings are significantly greater in thickness than traditional oxide films [6]. Aluminum and alloys based on it are widely applied as construction materials and carriers of various active systems. This is facilitated by the features of their physicmechanical and chemical properties. The presence of intermetallic compounds with magnesium, manganese, iron, and copper in the alloys provides a combination of mechanical strength and lightness of products. At the same time, surface heterogeneity significantly reduces corrosion resistance in aggressive environments and complicates the PEO process. It is especially difficult to synthesize thick coatings on copper-containing aluminum alloys [7]. Formation of coatings with mixed oxides on multi-component aluminum alloys, in most cases, is carried out by impregnation pre-oxidized porous layer of substrate H. Karakurkchi (B) · M. Ved’ · N. D. Sakhnenko National Technical University, Kharkiv Polytechnic Institute, 2, Kyrpychova str., 61002 Kharkiv, Ukraine e-mail: [email protected] © Springer Nature Switzerland AG 2021 O. Fesenko and L. Yatsenko (eds.), Nanomaterials and Nanocomposites, Nanostructure Surfaces, and Their Applications, Springer Proceedings in Physics 246, https://doi.org/10.1007/978-3-030-51905-6_26
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with solutions containing doping components and their subsequent treatment at high temperatures. But this does not allow achieving high adhesion of mixed oxide layer. In this regard, technical modes are of great interest, which make it possible to combine the surface homogenization of Al alloys with the formation of mixed conversion oxide coatings containing transition metals [8, 9]. Suchwise, strong adhesion and even distribution of the oxide layer over the surface are ensured. Metal oxides are used as catalysts in many technological processes in gas and liquid media, as electrode materials in electrochemical synthesis and chemical current sources [5, 10]. Of particu
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