Journal of Materials Engineering and Performance

, Volume 26, Issue 1, pp 105–114 | Cite as

Corrosion and Nano-mechanical Behaviors of Magnetron Sputtered Al-Mo Gradient Coated Steel

  • A. Venugopal
  • J. Srinath
  • P. Ramesh Narayanan
  • S. C. Sharma
  • P. V. Venkitakrishnan
Article
  • 95 Downloads

Abstract

A gradient three-layer Al-Mo coating was deposited on steel using magnetron sputtering method. The corrosion and nano-mechanical properties of the coating were examined by electrochemical impedance spectroscopy and nano-indentation tests and compared with the conventional electroplated cadmium and IVD aluminum coatings. Electrochemical impedance spectroscopy was performed by immersing the coated specimens in 3.5% NaCl solution, and the impedance behavior was recorded as a function of immersion time. The mechanical properties (hardness and elastic modulus) were obtained from each indentation as a function of the penetration depth across the coating cross section. The adhesion resistance of the coatings was evaluated by scratch tests on the coated surface using nano-indentation method. The results show that the gradient Al-Mo coating exhibits better corrosion resistance than the other coatings in view of the better microstructure. The impedance results were modeled using appropriate electrical equivalent circuits for all the coated systems. The uniform, smooth and dense Al-Mo coating obtained by magnetron sputtering exhibits good adhesion with the steel substrate as per scratch test method. The poor corrosion resistance of the later coatings was shown to be due to the defects/cracks as well as the lesser adhesion of the coatings with steel. The hardness and elastic modulus of the Al-Mo coating are found to be high when compared to the other coatings.

Keywords

EIS low-alloy steel pitting corrosion sputtered film 

Notes

Acknowledgments

The authors sincerely thank The Director, VSSC for his permission to publish the work.

References

  1. 1.
    K.R. Baldwin and C.J.E. Smith, Advances in Replacements for Cadmium Plating in Aerospace Applications, Trans. Inst. Met. Finish., 1996, 74, p 202–209Google Scholar
  2. 2.
    E.M.K. Hillier and M.J. Robinson, Hydrogen Embrittlement of High Strength Steel Electroplated with Zinc-Cobalt Alloys, Corr. Sci., 2004, 46, p 715–727CrossRefGoogle Scholar
  3. 3.
    M.J. Nelson and E.C. Groshart, Cadmium plating replacements, Aerospace environmental Technical Conference, Huntsville, Alabama, 10th-11th August 1994, p 277–284Google Scholar
  4. 4.
    P. Decker and K. Cramer, Development of alternate material selection system for cadmium replacement, Tri-service conference on corrosion, Wrightsville Beach, North Carolina, USA, Naval Surface Warfare Center, 17th-21st November, 1997, p 9.1–9.15Google Scholar
  5. 5.
    Prabhu Ganesan, Swaminatha P. Kumaraguru, and Branko N. Popov, Development of Compositionally Modulated Multilayer Zn-Ni Deposits as Replacement for Cadmium, Surf. Coat. Technol., 2007, 201, p 7896–7904CrossRefGoogle Scholar
  6. 6.
    A. Conde, M.A. Avenas, and J.J. de Damborenea, Electrodeposition of Zn-Ni Coatings as Cd Replacement for Corrosion Protection of High Strength Steel, Corros. Sci., 2011, 53, p 1489–1492CrossRefGoogle Scholar
  7. 7.
    C.J.E. Smith, Current requirements for the design and maintenance against corrosion of UK military aircraft, Advisory group for aerospace research and development (AGARD) Lecture Series No. 141 (1985) p. 6-1–6-13Google Scholar
  8. 8.
    C. Bowden and A. Matthews, A Study of the Corrosion Properties of PVD Zn-Ni Coatings, Surf. Coat. Technol., 1995, 76–77, p 508–515Google Scholar
  9. 9.
    E.V. Holmes, and J.J. Reilly, The substitution of IVD aluminum for cadmium, ESL-TR-90-28, Mcdonnel Aircraft company St. Louis MO, May 1990Google Scholar
  10. 10.
    B.R.W. Hinton, W.J. Pollock, P.N. Trathen, and A. Crosky, Ion Vapor Deposited Aluminum Coatings for the Corrosion Protection of Steel, Corros. Aust., 1987, 13, p 12–17Google Scholar
  11. 11.
    V.L. Holmes, M. Bridger, Aluminum coatings turn green: IVD process delivers environmentally friendly corrosion protection, Met. Finish., 2004, 102, p 6–10CrossRefGoogle Scholar
  12. 12.
    C.E.F. Rob Mason, M. Neidbalson, M. Kungenberg, F.L.A. Largo, P. Khabra, and C. Handsy, Update on alternatives for cadmium coating on military electrical connectors, Met. Finish., 2010, 108, p 12–18CrossRefGoogle Scholar
  13. 13.
    Q.S. Yu, J.E. Deffeyes, and H.K. Yasuda, Corrosion Protection of Ion Vapor Deposition (IVD) Al-Coated Al Alloys by Low Temperature Plasma Interface Engineering, Prog. Org. Coat., 2001, 42, p 100–109CrossRefGoogle Scholar
  14. 14.
    A. Aguero, J.C. Del Hoyo, J. Garcia de Blas, M. Garcia, M. Gutierrez, L. Madueno, and S. Ulargui, Aluminum Slurry Coatings to Replace Cadmium for Aeronautic Applications, Surf. Coat. Technol., 2012, 213, p 229–238CrossRefGoogle Scholar
  15. 15.
    N.M. Alanazi, A. Leyland, A.L. Yerokhin, and A. Matthews, Substitution of Hexavalent Chromate Conversion Treatment with a Plasma Electrolytic Oxidation Process to Improve the Corrosion Properties of Ion Vapour Deposited Al-Mg Coatings, Surf. Coat. Technol., 2010, 205, p 1750–1756CrossRefGoogle Scholar
  16. 16.
    O.A. Fasuba, A. Yerokhin, A. Matthews, and A. Leyland, Corrosion Behavior and Galvanic Coupling with Steel of Al-Based Coating Alternatives to Electroplated Cadmium, Mater. Chem. Phys., 2013, 141, p 128–137CrossRefGoogle Scholar
  17. 17.
    D.P. Monaghan, D.G. Teer, A. Logan, K.C. Laing, R.I. Bates, and R.D. Arness, An Improved Method for the Deposition of Corrosion-Resistant Aluminium Coatings for Aerospace Application, Surf. Coat. Technol., 1993, 60, p 592–596CrossRefGoogle Scholar
  18. 18.
    K.R. Baldwin, R.I. Bates, R.D. Arnell, and C.J.E. Smith, Aluminium-Magnesium Alloys as Corrosion Resistant Coatings for Steel, Corros. Sci., 1996, 38, p 155–170CrossRefGoogle Scholar
  19. 19.
    M. Bielawski, Development of Unbalanced Magnetron Sputtered Al-Mo Coatings for Cadmium Replacement, Surf. Coat. Technol., 2004, 179, p 10–17CrossRefGoogle Scholar
  20. 20.
    A. Venugopal, P. Ramesh Narayanan, S.C. Sharma, and K.M. George, Electrochemical Corrosion Behavior of Magnetron-Sputtered Al-Mo Gradient Coated Steel in 3.5% NaCl Solution, J. Mater. Eng. Perform., 2016, 25, p 790–799CrossRefGoogle Scholar
  21. 21.
    Aircraft steel specification H11 (equivalent to AMS 6485)Google Scholar
  22. 22.
    W.C. Oliver and G.M. Pharr, An Improved Technique for Determining Hardness and Sensing Indentation Experiments, J. Mater. Res., 1992, 24, p 1564–1583CrossRefGoogle Scholar

Copyright information

© ASM International 2016

Authors and Affiliations

  • A. Venugopal
    • 1
  • J. Srinath
    • 1
  • P. Ramesh Narayanan
    • 1
  • S. C. Sharma
    • 1
  • P. V. Venkitakrishnan
    • 1
  1. 1.Materials and Metallurgy Group, Materials and Mechanical Entity, Vikram Sarabhai Space CentreIndian Space Research OrganizationThiruvananthapuramIndia

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