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Preparation and corrosion protection of Al2O3-TiO2-Ta coating on aluminum surface by plasma spraying
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1.Guangdong Power Grid Co,Ltd Electric Power Research Institute;2.South China University of Technology

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    Abstract:

    Plasma-sprayed Al2O3-TiO2 and Al2O3-TiO2-Ta coatings were fabricated on aluminum substrates. Due to the introduction of tantalum, Al2O3-TiO2-Ta coating surface morphology is more uniform and compact. At the same time tantalum metal has a very strong acid and alkali resistance, therefore, Al2O3-TiO2-Ta coating relative to the Al2O3-TiO2 coating has a stronger corrosion resistance. The results of Tafel curves show that the corrosion potential of Al2O3-TiO2 coatings shifts the positive corrosion potential by 99.6 mV, and that of Al2O3-TiO2-Ta coatings shifts the corrosion potential of Al by 208.9 mV. Therefore, the corrosion resistance of Al2O3-TiO2 has been greatly enhanced due to the incorporation of Ta metal with high corrosion resistance. The Al2O3-TiO2-Ta coating can effectively prevent the corrosion of the aluminum alloy.

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[Feng Huang, Ming Nie, Wenhao Zhou, Zhengao Wang, Ruming Fu, Chengyun Ning. Preparation and corrosion protection of Al2O3-TiO2-Ta coating on aluminum surface by plasma spraying[J]. Rare Metal Materials and Engineering,2019,48(8):2689~2693.]
DOI:10.12442/j. issn.1002-185X.20180193

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History
  • Received:March 06,2018
  • Revised:April 04,2018
  • Adopted:April 26,2018
  • Online: September 05,2019
  • Published: