ELECTRON BEAM TREATMENT AND HARD ANODIC OXIDATION OF ALSI7 ALLOYS TO IMPROVE THE ANODIC OXIDE PROPERTIES
Bestetti M.1, 2, Huspek A. L.1, Akdogan B.1, Akhmadeev Yu. H.3, Petrikova E. A.3, Ivanov Yu. F.3, Moskvin P. M.3, and Koval N.3
1 Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria “Giulio Natta”
20133, Piazza Leonardo da Vinci, 32, Italia
2 Tomsk Polytechnic University, The Weinberg Research Centre
634050, Tomsk, Lenin Ave., 2, bd. 4, Russia
3 Institute of High Current Electronics, Siberian Branch of Russian Academy of Science (IHCE SB RAS) 634055, Tomsk, Akademichesky Ave., 2/3, Russia
Al-Si alloys are among the most common aluminium-based cast products due to their high strength-to-weight ratio, excellent processability and relatively low cost. Their surface mechanical properties and corrosion resistance are usually enhanced by forming a protective anodic oxide coating by means of hard anodic oxidation. However, the presence of silicon particles within the aluminium matrix decreases the quality and integrity of the anodic oxide. In the present work, RITM-SP and SOLO electron beam facilities are used to modify the distribution of silicon in the surface region of the alloy. The hard anodic oxides produced after electron beam pre-treatment were characterized by SEM-EDS and in term of corrosion resistance properties.