The influence of electrodeposited Ni-Co alloy coating microstructure on CO2 corrosion resistance on X65 steel

Ruidie Tang, Gaurav R. Joshi, Hu Zhao, Sai P. Venkateswaran, Philip J. Withers, Ping Xiao

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Abstract

Electrodeposited Ni-Co alloy coatings are investigated for the protection of X65 carbon steel in sweet (CO2) corrosion environments. Two coatings having different microstructures but similar cobalt contents were fabricated to investigate the microstructural influences on CO2 corrosion resistance. Experimental results show that the fibre-like Ni-Co micro-structured coating offers a corrosion resistance that is 2 orders of magnitude greater than the cone-like coating. This strong effect of microstructure is believed to arise from the larger surface/solution contact area, the higher density of grain boundaries and active defects, and the lower protective oxide content on surface of the cone-like Ni-Co coating.
Original languageEnglish
Pages (from-to)108485
JournalCorrosion Science
Early online date21 Jan 2020
DOIs
Publication statusPublished - 2020

Keywords

  • A. Metal coatings
  • B. EIS
  • B. SEM
  • C. Electrodeposited films
  • C. Interfaces

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