Electroless Ni-P/diamond /graphene composite coatings and characterization of their wear and corrosion resistance in sodium chloride solution

Cheng Kuo Lee, Chi Lun Teng, An Hung Tan, Ching Yi Yang, Sheng Long Lee

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Scopus citations

Abstract

The purpose of the present study is to evaluate the effect of the electroless Ni-P/diamond/graphene composite coating on the structure and surface hardness of 2024-T6 aluminum alloy as well as their effect on the corrosion and wear resistance of the alloy in 3.5 % NaCl solution. The electroless Ni-P plating solution was prepared by adding different size diamond (6-12 μm and 0.2 μm) and nano-graphene into the electroless Ni-P plating solution to obtain Ni-P/diamond, Ni-P/graphene and Ni-P/daimond/graphene composite coatings for comparison. Experimental results indicated that the Ni-P/diamond, Ni-P/graphene and Ni-P/daimond/graphene composite coatings can be successfully electroless deposited on anodized 2024-T6 aluminum alloy. The anodically oxidized films, that formed on the aluminum alloy using phosphoric acid as the electrolyte, was porous with high density of pores, and thus could enhance the adhesion of the composite coatings. The Ni-P/daimond/graphene hybrid coating had a higher hardness as well as better corrosion and wear resistance of 2024-T6 alloy in 3.5 wt.% NaCl solution as compared with other composite coatings. When the combination of nano-graphene and smaller diamond particles added this beneficial effect was significantly raised, especially the composite coating was further vacuum annealed at 400°C for 24 h to obtain a more smooth and defect-free coating structure.

Original languageEnglish
Title of host publicationRecent Development in Machining, Materials and Mechanical Technologies
EditorsJyh-Chen Chen, Usuki Hiroshi, Sheng-Wei Lee, Yiin-Kuen Fuh
PublisherTrans Tech Publications Ltd
Pages51-56
Number of pages6
ISBN (Print)9783038354956
DOIs
StatePublished - 2015
EventInternational Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014 - Taipei City, Taiwan
Duration: 31 Aug 20145 Sep 2014

Publication series

NameKey Engineering Materials
Volume656-657
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Conference

ConferenceInternational Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014
Country/TerritoryTaiwan
CityTaipei City
Period31/08/145/09/14

Keywords

  • Anodizing
  • Composite coating
  • Corrosion
  • Electroless plating
  • Ni-P/diamond/graphene
  • Wear

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