Babak Ghorbanian | Searcharxiv

arXiv2023

Investigation of alumina formed by plasma electrolytic saturation

The process of alumina coating on the steel surface plasma electrolytic method is a method for increasing the corrosion resistance, in this process, electrolytic aluminum containing compounds should be able to cover the surface. The results show the size of a micron coating of cauliflower shape and distance of an average of about 6 microns. The coating on steel sample acted as a passive layer and corrosion resistance increases slightly. This is due to the low corrosion resistance because of the lack of uniformity and surface finish are not.

physics.plasm-ph↗

arXiv2020

Optimization of allotropic and hardness of aluminum oxide coating by PEO

One of the most important methods of producing materials and oxide coating is plasma electrolytic oxidation (PEO). Coatings made on aluminum in PEO method have two allotropes of $α$-Al$_2$O$_3$ and $γ$-Al$_2$O$_3$. Coatings containing $α$-Al$_2$O$_3$ have more hardness and wear resistance; therefore, the main goal of the present study is to optimize aluminum oxide allotrope for increasing the ratio of $α$-Al$_2$O$_3$ in coating made with PEO method. Results of the present study shows that the optimum electrolyte compound for making highest phase of $α$-Al$_2$O$_3$ has 2.9 g/lit of KOH, 1.15 g/lit of Na4P2O7, and 0.34 g/lit of NaAlO2 and ratio of highest allotropic pick of $α$-Al$_2$O$_3$ to highest allotropic pick of $γ$-Al$_2$O$_3$ (in XRD test) in the optimum condition is 0.622 and hardness is 1648 Vickers.

physics.chem-ph↗