Research of the peculiarities of plasma-electrolytic treatment of AK12M2MgN piston alloy with formation of ceramic-like coatings
Journal Title: Технологический аудит и резервы производства - Year 2018, Vol 1, Issue 1
Abstract
<p class="20CxSpFirst">The object of research is the processes of the piston alloy AK12M2MgH treatment by the method of plasma electrolytic oxidation (PEO) with the formation of ceramic underlying coatings. One of the most problematic places is the influence of the chemical composition of the Al-Si alloy on the process of treatment and formation of ceramic coatings. It is established that electrochemical technologies are widely used to modify the surface of silumins by forming coating of various composition and purpose.</p><p class="20CxSpMiddle">In the course of the study it was shown that PEO of piston silumin should be carried out in alkaline complex electrolytes with the addition of manganese and/or cobalt salts. This makes it possible to homogenize the surface layer of the alloy by composition, to reduce the content of its alloying components and to create conditions for the formation of a uniform oxide coating with incorporation of the admissible components.</p><p class="20CxSpLast">It has been established that oxidation in pyrophosphate cobaltous solution allows obtaining mosaic structures of blue-violet color with cobalt content up to 24 at %. PEO silumin in the manganous alkaline electrolyte provides the formation of a brown-black ceramic-like layer with manganese content up to 35 at %. Consecutive PEO treatment in these solutions leads to the formation of a mixed fine-dispersed porous oxide coating with a total content of dopant 25–30 at %. Based on the research results, it has been proposed to oxidize the piston silumin in a regime of incident power to form uniform coatings with a high content of dopant.</p><p><em>Obtained oxide systems have a developed surface and a significant content of catalytically active components. In comparison with the known methods of PEO treatment of piston silumin, the silicon content in the surface oxide layers does not exceed 3 at %, which is one of the requirements for catalytically active materials.</em></p><p><em>The ceramics-like coatings show high catalytic activity in model oxidation reactions of CO and benzene and reduce the emission of toxic gas emissions from internal combustion engines. The proposed systems are promising for use in intracylindrical catalysis technologies and improving the fuel economy of engines.<strong></strong></em></p>
Authors and Affiliations
Ann Karakurkchi, Mykola Sakhnenko, Maryna Ved, Igor Parsadanov
Keywords
Related Articles
- EP ID EP527287
- DOI 10.15587/2312-8372.2018.124188
- Views 130
- Downloads 0
Investigation of the existing methodology of value estimation and methods of discount rate estimation
<p><em>The subject of research is the current practice of determining the fair value of assets and liabilities at the present (discounted) cost. One of the most problematic places is the determination of the discount rat...
Paradoxes in the labor market of the 21st century: analysis of the microbusiness in Latvia
<p><em>The object of research is microenterprises in Latvia. One of the most problematic places is the constant tightening of fiscal measures in relation to existing and newly created microenterprises. Including the incr...
National strategic innovation security conceptualization
<p><em>The object of research is the strategic innovation security of the country. The need to analyze the innovative dimension of strategic security is due to the fact that narrowing national security in the military an...
Reduction of technological risks in subway and rail transport
<p><em>The aim of research is ensuring the guaranteed safety of passengers traveling on subway trains. The object of the researches carried out by the authors is process of interaction of the subway arriving at high spee...
Stagflation substantiation as an indication of systemic crisis in the financial sector of the economy
<p><em>It is established that the quantitative indicators for the systemic transformation crisis in the economic literature are not determined, given their complexity and uniqueness for national economies. It is possible...