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Influence of pulse parameters on electrocodeposition of Cr-Al2O3 nanocomposite coatings from trivalent chromium bath

Salehi Doolabi, M ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1179/1749514812Z.00000000030
  3. Publisher: 2012
  4. Abstract:
  5. Cr and Cr-Al2O3 coatings were electrodeposited from Cr(III) bath with both pulsating and direct current onto copper substrates. Pulsating current resulted in homogeneous films of higher Al2O3 content and lower particle agglomeration than the direct current. Differences were more tangible at shorter duty cycles and pulse frequencies. Pulsating current improved both microhardness and corrosion resistance. The presence of alumina nanoparticles resulted in greater current efficiency, higher film microhardness and better corrosion resistance. Maximum current efficiency, highest microhardness and densest electrodeposited coatings were achieved at current density of 20 A dm-2, duty cycle of 40% and pulse frequency of 10 Hz
  6. Keywords:
  7. Codeposition ; Corrosion-resistant ; Microhardne ; Pulse plating ; Trivalent chromium ; Alumina ; Aluminum ; Chromate coatings ; Chromium ; Chromium compounds ; Corrosion resistance ; Electrodeposition ; Microhardness ; Nanocomposites ; Aluminum coatings
  8. Source: International Heat Treatment and Surface Engineering ; Volume 6, Issue 4 , December , 2012 , Pages 178-184 ; 17495148 (ISSN)
  9. URL: http://www.maneyonline.com/doi/abs/10.1179/1749514812Z.00000000030