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The Dependence of Coating Characteristics on Progress Parameters and Alloy Compositions
Terleeva, Olga. P.,Oh, Young-Joo,Ok, Myoung-Ryul,Utkin, Vladimir V.,Ha, Heon-Phil,Lee, Dong-Heon The Japan Institute of Metals 2005 Materials transactions Vol.46 No.11
<P>The coating characteristics on the surfaces of the aluminum alloys A1230, A2017, Al–7.6 mass%Si, and Al–10.4 mass%Si formed at AC polarization were investigated. The intervals of current densities and process durations were checked, and data consisting of coating thickness and increases in size and weight were obtained. The presence of the high-temperature aluminum oxide phases, which provide high physical-mechanical coating characteristics, was registered with the help of the Bruker D8 Advanced X-ray diffractometer.</P>
Terleeva, Olga P.,Oh, Young-joo,Slonova, Alexandra I.,Kireenko, Irina B.,Ok, Myoung-Ryul,Ha, Heon-Phil The Japan Institute of Metals 2005 Materials transactions Vol.46 No.9
<P>Positive (anode) and negative (cathode) voltage-time charts have been registered for half-wave anodic, AC polarization, and AC-C polarization and for negative polarization (C-packets), respectively. During the process, the visual characteristic changes of the microdischarges were also analyzed, namely: the color and dimension of the microdischarges and the character of the movement on the surface. The quantitative parameters for the microplasma process stages were also defined. For different aluminum alloys, it was found that spark voltage and microarc voltage are not dependent on the alloy composition and the current density. It was likewise shown that a negative current has no influence on the process parameters at the initial stages of the AC microplasma processes. The study’s hypothesis on the role of a negative current in initiating phase transition was therefore confirmed.</P>
Terleeva, O. P.,Oh, Young-Joo,Ok, Myoung-Ryul,Slonova, A. I.,Kireenko, I. B.,Lee, Dong-Heon The Japan Institute of Metals 2006 MATERIALS TRANSACTIONS Vol.47 No.7
<P>The structure and phase composition of microplasma coatings formed on a Ti-6Al-4V alloy using the alternating current mode in solutions with different concentrations of KOH, NaAlO<SUB>2</SUB> and Na<SUB>6</SUB>P<SUB>6</SUB>O<SUB>18</SUB> were investigated using XRD analysis, microscope analysis and microhardness testing. The thickness and weight gain were measured with electronic thickness gage and correspondingly, with the gravimetric method. The crystal structure of the microplasma electrolytic coatings had amorphous, rutile, α-Al<SUB>2</SUB>O<SUB>3</SUB> and Al<SUB>2</SUB>TiO<SUB>5</SUB> phase. The coating morphology may be presented as 3 layers—the external amorphous layer, the internal layer, and the barrier layer.</P>