Investigation of MAO coating formed on the aluminum alloy of Al-Mg-Sc

In the production of modern rocket and space technology, 01570 aluminum alloy system Al-Mg-Sc is applied. Alloy 01570 has high strength characteristics (370-390 MPa), with all the positive properties of this alloy, its corrosion resistance is not high when operating conditions in corrosive environments that affect the physical and mechanical characteristics of the surface. There is a possibility to solve this problem, increasing the operational properties of the alloy, such as surface treatment, micro-arc oxidation (MAO). MDO technology of obtaining the oxide coating with a unique combination of properties that allows using the product in extreme conditions. Experimental studies on the formation of microarc oxidation coatings were conducted on samples of aluminum alloy 01570. As a result, it was found that the thickness of the oxide layer produced on the alloy 01570, less than the alloy AMg6, obtained under identical processing conditions. The analysis of the morphology of the coating, which is characterized by its porosity and has an influence on the corrosion resistance and strength characteristics of the treated surface, which is fundamental in the operation of rockets. Specifically, when the magnification ratio of the cathodic and anodic components of the current Ik/Ia) surface changes its structure, the number of pores is reduced, is rendered more uniform, smooth surface. According to the results of electron microscopy established that in dense areas of defect-free aluminium oxide content increases, in areas with complex relief structure is dominated by aluminosilicates and surface complexes formed from the composition of the electrolyte. In the coating formed on the alloy 01570, the aluminium oxide content of up to 80 %.