Abstract
Technological approaches to surface electrochemical treatment of aluminum alloys are analyzed. It is shown that directed modification of the carrier surface allows expanding the functional properties of the treated material. The mechanisms of treatment of aluminum alloys of different composition are investigated and technological models of processes using generalized phenomenological schemes are developed. Methods surface forming treatment of aluminum alloys by pulse current forming in chloride-containing electrolytes and plasma electrolytic oxidation in alkaline solutions of diphosphates are proposed. It is shown that the use of pulse electrolysis promotes the formation of a developed mesh and porous structure. Control methods and factors of the treatment process are generalized. The resulting systems can be used as carriers of catalytic material provided that a secondary catalytically active layer is applied. It is found that using plasma electrolytic oxidation, it is possible to change the shape and homogenize the surface layers of the carrier and apply a tightly adhered layer of catalytic material in one technological process. It is shown that the characteristic parameters of PEO depend on the composition of the treated material. It is revealed that the morphology and phase structure of surface oxide layers change during PEO. The formed oxide coatings consist of α-Al 2 O 3 and have a high degree of surface development, which is a prerequisite for increasing their functional properties. The proposed approach can be used in surface engineering technology and for obtaining materials for environmentally friendly technologies
Highlights
The use of aluminum alloys is quite common today and has significant prospects for further development
An important direction is the use of aluminum alloys as carriers of catalytic systems and catalysts for neutralizing toxic substances in gas and liquid phases [6, 7]
The method for surface forming of aluminum alloys by pulse current treatment in chloride-containing electrolytes is developed
Summary
The use of aluminum alloys is quite common today and has significant prospects for further development. In order to increase strength characteristics, alloying components (manganese, iron, copper, silicon, magnesium, etc.) are introduced into alloys, which form intermetallic compounds in the alloy structure This causes the surface heterogeneity of alloyed aluminum alloys, significantly reduces corrosion resistance in aggressive media and complicates the surface treatment of such materials [9]. To give additional functional properties to the surface, surface modification methods are used, when predetermined indicators can be achieved without changing the structure of the base material [10] Such surface engineering technologies are in demand and promising. Scientific and applied studies of mechanisms for modifying the surface layers of aluminum alloys and substantiation of technological control models of the treatment process, in particular providing catalytic properties to the treated surface are in demand
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