Diffusion model for growth of Fe2B layer in pure iron

I. Campos-Silva*, M. Ortiz-Domínguez, H. Cimenoglu, R. Escobar-Galindo, M. Keddam, M. Elías-Espinosa, N. López-Perrusquia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


A simple diffusion model is proposed to estimate the growth kinetics of Fe2B layers created at the surface of pure iron. This model employs the mass balance equation at the Fe2B/substrate interface to evaluate the boron diffusion coefficient (DFe2B) in the boride layer. The Fe2B layers were formed using the paste boriding process, at four temperatures with different exposure times. Analysing the results, the evolution of the parabolic growth constant (k) of the Fe2B layer is presented as a function of boron concentration and boride incubation time [t0(T)]. Furthermore, the instantaneous velocity of the Fe2B/substrate interface and the weight gain of borided pure iron were estimated for different boriding temperatures. Finally, to validate the diffusion model, the boride layer thicknesses were predicted and experimentally verified for two boriding temperatures and for different treatment times.

Original languageEnglish
Pages (from-to)189-195
Number of pages7
JournalSurface Engineering
Issue number3
Publication statusPublished - Apr 2011


  • Activation energy
  • Boride incubation time
  • Boride layers
  • Boron concentration
  • Diffusion model
  • Growth kinetics
  • Parabolic growth constant
  • Paste boriding process


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