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Effects of Rice husks ash addition on alumina layers deposited on 2024 aluminum alloys by micro-arc oxidation(MAO).

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 سمير حامد عواد الربيعي
19/03/2019 10:43:26
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Aluminum and its alloys are becoming increasingly significant, particularly in the aerospace and automotive manufactures. Anyhow, these substances tend to have poor wear resistance and micro-hardness. So, the aim of this study, formation of ceramic oxide coatings by the micro-arc oxidation (MAO) on 2024 aluminum alloy with rice husks ash containing electrolyte solution. The XRD, EDS, SEM, micro-hardness, thickness, roughness and wear tests were used to evaluate the microstructure, morphology of deposited phases and coating properties. The results proved that the formation of hard ceramic coatings were values (246.8-496.6)HV. Roughness increased with deposition time increasing (2.320-6.837)?m, thickness of coatings variation with deposition time (25-48.8)?m. The structure of coatings was characterized by the porosity, with increasing RHA ratio from (5 to 15)g the structure became less porous particularly with increasing deposition time to 45min. Also, the RHA addition could improve wear resistance by means of decreasing loss weight from 0.0017 to (0.0006-0.0005)g and decreasing friction coefficient from 0.66 to (0.34-0.52) for(15g/l RHA, 5g/l KOH), (10g/l KH2PO4, 4g/lH3PO4, 5g/lNaCO3, 6g/l (NH3)2MO7O24, 4g/l KOH, 6g/l RHA), respectively. Finally it can be concluded that the properties of ceramic oxide coatings improved with addition of natural additive( rice husks ash).

  • وصف الــ Tags لهذا الموضوع
  • Micro-arc oxidation, aluminum alloys, rice husk