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Pulsed electrodeposition and characterization of bronze-graphite composite coatings

Nickchi, T ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.surfcoat.2009.03.029
  3. Publisher: 2009
  4. Abstract:
  5. Composite coatings containing self-lubricant particles like graphite, MoS2, PTFE are extensively used to decrease the coefficient of friction of tribo-surfaces. The aim of this study is to investigate the effect of pulse electrodeposition parameters on particle codeposition process and characteristics of bronze-graphite composite coatings electrodeposited from cyanide-stannate bronze electroplating bath. Results showed a slight increase in tin content and a promising increase in hardness of bronze coating by a decrease in duty cycle at constant average current density. Both tin content of the coating and grain refinement seem to participate in hardness enhancement. By increasing the agitation rate, an increase in graphite content of composite coating is observed followed by a decrease by further increasing of agitation rate. Keeping the average current density constant at 10 mA cm- 2, graphite content of the coating is increased from 4% vol. to 18% vol. by decreasing the duty cycle from 1 to 0.05. The results showed that with an increase in graphite content of the coating, hardness and coefficient of friction of the coating would decrease and the lowest friction coefficient was obtained at 12% vol. graphite. © 2009 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Bronze-graphite ; Composite coating ; Agitation rates ; Average current densities ; Bronze coating ; Codeposition process ; Coefficient of frictions ; Duty cycles ; Effect of pulse ; Electroplating bath ; Friction coefficients ; Graphite composite coatings ; Graphite content ; Hardness enhancement ; Pulse electrodeposition ; Pulsed electrodeposition ; Self-lubricant ; Stannate ; Tin content ; Tribological properties ; Bronze ; Cyanides ; Electrodeposition ; Friction ; Grain refinement ; Graphite ; Hardness ; Molybdenum compounds ; Tin ; Tribology ; Composite coatings
  8. Source: Surface and Coatings Technology ; Volume 203, Issue 20-21 , 2009 , Pages 3037-3043 ; 02578972 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0257897209002850