Influence of the Composition of Electrolytes on the Properties of Plasma-Electrolytic Oxide Coatings on Light Alloys
- PDF / 431,237 Bytes
- 7 Pages / 594 x 792 pts Page_size
- 86 Downloads / 191 Views
INFLUENCE OF THE COMPOSITION OF ELECTROLYTES ON THE PROPERTIES OF PLASMA-ELECTROLYTIC OXIDE COATINGS ON LIGHT ALLOYS H. V. Chumalo,1, 2 V. M. Posuvailo,1 E. V. Kharchenko,3 and V. M. Palyukh4
UDC 621.193
We study the effect of various electrolytes on the functional characteristics of the coatings deposited by the method of plasma-electrolyte oxidation (PEO) on aluminum and magnesium alloys. The influence of the concentration of alkali on the formation of PEO coatings is demonstrated. The prospects of application of KOH (NaOH)– Na 2SiO 3 combined electrolytes with various additives (glycerin, borax, fluorides, and nanoparticles) with an aim to get high corrosion-mechanical characteristics of the coatings are analyzed. It is shown that the composition and thickness of oxide coatings on light alloys can be controlled by choosing the components of electrolyte and the conditions of PEO. Keywords: plasma-electrolyte oxidation, aluminum alloy, magnesium alloy, electrolyte, thickness of the oxide layer.
Introduction In view of the increasing severity of the operating conditions, high aggressiveness of the applied technological media, and the corresponding tightening of the requirements to structural materials, the problem of creation of new environmentally friendly technologies of deposition of highly efficient and reliable coatings aimed at the protection and strengthening of metal products turns into one of the most urgent tasks of contemporary science and engineering. The procedure of plasma-electrolyte oxidation (PEO) is a relatively new type of surface treatment and hardening of metallic materials, which enables one to get multifunctional ceramic-type coatings possessing a unique complex of properties. In this way, it is possible to produce new wear-, corrosion-, and heat-resistant, insulating, and decorative coatings [1–9]. The multifunctional properties of the PEO coatings facilitate their applications in various branches of industry, including the aerospace, instrument-making, electronic, chemical, oil-and-gas, automotive, tool-making, textile, medical, building, machine-building, etc. industries. The spectrum of treated products permanently increases. However, the possibilities of the method are far from being exhausted. Note that, at present, the problems of determination of the conditions of oxidation of multicomponent aluminum or magnesium alloys and substantiation of the compositions of electrolytes and the conditions of PEO required for the formation of coatings are studied insufficiently. The aim of the present work is to evaluate the influence of the compositions of electrolytes on the properties of PEO coatings on light alloys and to recommend the optimal compositions guaranteeing the attainment of the required functional characteristics. 1 2 3 4
Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine. Corresponding author; e-mail: [email protected]. Uniwersytet Warminsko-Mazurski, Olsztyn, Poland.
“L’vivs’ka Politekhnika” National University, Lviv, Ukraine.
Trans
Data Loading...
