Effects of Laser Re-melting on the Corrosion Properties of HVOF Coatings

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Abstract

HVOF coating of Inconel 625 powder on carbon steel is carried out. Laser melting of the resulting coating is realized to improve coating structural integrity. Morphological and microstructural changes are examined in the coating prior and after laser treatment process using scanning electron microscopy, energy dispersive spectroscopy, and x-ray diffraction (XRD). The residual stress developed is measured on the surface vicinity of the laser-treated coating using the XRD technique. The corrosion resistance of the laser-treated and untreated coating surfaces is measured, incorporating the potentiodynamic tests in 0.5 M NaCl aqueous solution. It is found that laser treatment reduces the pores and produces cellular structures with different sizes and orientations in the coating. Laser-controlled melting improves the corrosion resistance of the coating surface.

Keywords

corrosion resistance HVOF laser 

Notes

Acknowledgments

The authors acknowledge the support of King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia for this study.

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Copyright information

© ASM International 2012

Authors and Affiliations

  • B. S. Yilbas
    • 1
  • I. H. Toor
    • 1
  • F. Patel
    • 1
  • M. A. Baig
    • 1
  1. 1.Department of Mechanical EngineeringKing Fahd University of Petroleum and Minerals (KFUPM)DhahranKingdom of Saudi Arabia

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