Chapter 20
Characterization of Hydrogen Permeability in Zn, Zn-Ni, Cd and Cd-Ti Coated Steel


Zn and Cd based coatings are used in industrial applications for corrosion protection. During electrodeposition the evolved hydrogen may get trapped in the coating, migrate towards the steel lattice and cause embrittlement. The hydrogen permeability of the coating depends on the plating process, microstructure and defect distribution. Hydrogen embrittlement and re-embrittlement due to the coating processes was studied by electrochemical permeation method. The hydrogen generated by coating process and hydrogen permeation was correlated with the microstructure of the coating/substrate interface. Zn-Ni coating was observed to ingress the least quantity of hydrogen and also had the lowest hydrogen permeability.

  • Introduction
  • Experimental Methedology
  • Results and Discussion
  • Conclusions
  • Acknowledgements
  • References

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