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The Investigation of Effective Parameters in Coating on Aluminized Steel by Plasma Electrolytic Oxidation Process

Jafarniya, Vahid | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41420 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Faghihi Sani, Mohammad Ali
  7. Abstract:
  8. Plasma electrolytic oxidation process (PEO) is now recognized as a relatively new method in surface engineering. In this process, formation of micro arcs resulted from electric discharges on the surface of the specimen in the appropriate electrolyte, is used to ionize the gas layer which has enshrouded the specimen. In the present study, ceramic coating on aluminized steel was produced by PEO process and the effects of the influential parameters were comprehensively investigated. For this purpose, coating on the aluminized steel with dimension of 25×30 mm² was produced under different condition of processing time from 1 to 15 minutes, current density from 10 to 20 A/dm², frequency from 50 to 1500 Hz, sodium silicate concentration from 4 to 30 gr/lit and sodium hydroxide concentration from 1 to 4 gr/lit. Afterwards, the influence of each parameter on surface morphology, coating cross section, coating composition, voltage – time response, corrosion resistance and wear rate was investigated. The corrosion test showed that by increasing the processing time and input current frequency which resulted in increase of coating thickness and compaction respectively, corrosion resistance of the coating was enhanced up to 2 orders of magnitude in comparison with bare substrate. High coefficient of friction of the coated specimens was attributed to the porous surface of these specimens which is a morphological characteristic of this coating, but the weight loss of the coated specimens due to formation of hard oxide compounds, were greatly lower than aluminized steel substrate
  9. Keywords:
  10. Process Parameters ; Plasma Electrolytic Oxidation ; Ceramic Coating ; Aluminized Steel ; Oxidation Coating

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