Corrosion Analysis of TiCN Coated Al-7075 Alloy for Marine Applications: A Case Study

  • M. K. SrinathEmail author
  • M. S. Ganesha Prasad
Case Study


Corrosion is one of the most important marine difficulties that cause long term problems, occurring in ships and submarines surrounded by a corrosive environment when coupled with chemical, temperature and stress related conditions. Corrosion of marine parts could lead to severe disasters. Coatings and heat treatment in a very effective way could be used to protect the aluminium parts against corrosion. The present case study focuses on the corrosion and microstructural properties of TiCN coatings fabricated on Al-7075 aluminium alloy substrate by using Physical Vapour Deposition technique. Corrosion properties of specimen’s heat treated at 500 °C at durations of 1, 4, 8 and 12 h were tested through salt spray test. According to D-1193, ASTM standard, corrosion resistance of coated and heat treated Al-7075 samples were investigated in solution kept at 95 °F with a pH of 6.5–7.2, with 5 sections of NaCl to 95 sections of type IV water. The specimen’s heat treated for 1 h showed positive corrosion resistance, while the specimens treated for longer durations had the opposite effect. The microstructures of the salt spray tested coatings were investigated by scanning electron microscope. X-ray diffraction tests were conducted on specimens to determine the atomic and molecular structure of the surface crystals and the unit cell dimensions. The corrosion mechanisms of the coated specimens under the heat treated conditions have been explored.


Corrosion TiCN Al-7075 PVD coating SEM XRD 


  1. 1.
    S.M. Hassani-Gangaraj, A. Moridi, M. Guagliano, Critical review of corrosion protection by cold spray coatings. Surf. Eng. 31, 803–815 (2015)CrossRefGoogle Scholar
  2. 2.
    N. Bala, H. Singh, J. Karthikeyan, S. Prakash, Cold spray coating process for corrosion protection: a review. Surf. Eng. 30, 414–421 (2014)CrossRefGoogle Scholar
  3. 3.
    A. Dey, R. Umarani, H.K. Thota, P. Bandyopadhyay, A. Rajendra, A.K. Sharma, A.K. Mukhopadhyay, Corrosion and nanoindentation studies of MAO coatings. Surf. Eng. 30, 913–919 (2014)CrossRefGoogle Scholar
  4. 4.
    H. Koivuluoto, P. Vuoristo, Structure and corrosion properties of cold sprayed coatings: a review. Surf. Eng. 30, 404–413 (2014)CrossRefGoogle Scholar
  5. 5.
    S.T. Aruna, G. Srinivas, Wear and corrosion resistant properties of electrodeposited Ni composite coating containing Al2O3–TiO2 composite powder. Surf. Eng. 31, 708–713 (2015)CrossRefGoogle Scholar
  6. 6.
    C. Wen, X. Zhan, X. Huang, F. Xu, L. Luo, C. Xia, Characterization and corrosion properties of hydroxyapatite/graphene oxide bio-composite coating on magnesium alloy by one-step micro-arc oxidation method. Surf. Coat. Technol. 317, 125–133 (2017)CrossRefGoogle Scholar
  7. 7.
    D.T. Gawne, Surface engineering; advanced materials for industrial applications. Revista Latinoamericana de Metalurgia y Materiales 13, 5–15 (1993)Google Scholar
  8. 8.
    T.D. Nguyen, X. Peng, J. Zhang, D.J. Young, Corrosion resistance of chromised and aluminised coatings in wet CO2 gas at 650 °C. Surf. Coat. Technol. 316, 226–238 (2017)CrossRefGoogle Scholar
  9. 9.
    M.H. Jacob, Surface engineering of materials. Mater. Des. 14, 33 (1993)CrossRefGoogle Scholar
  10. 10.
    M. K. Srinath, M. S. Ganesha Prasad, Surface morphology and hardness analysis of TiCN coated AA7075 Aluminium Alloy. J. Inst. Eng. India Ser. C. (2017). Google Scholar
  11. 11.
    K. Brunelli, M. Dabala, C. Martini, Surface hardening of Al-7075 alloy by diffusion treatments of electrolytic Ni coatings. la metallurgia italiana 7–8, 37–40 (2006)Google Scholar
  12. 12.
    N.G. Krishna, C. Thinaharan, R.P. George, N. Parvathavarthini, U. Kamachi Mudali, Surface modification of type 304 stainless steel with duplex coatings for corrosion resistance in sea water environments. Surf. Eng. 31(1), 39–47 (2015)CrossRefGoogle Scholar
  13. 13.
    X.-B. Chen, H.-Y. Yang, T.B. Abbott, M.A. Easton, N. Birbilis, Corrosion protection of magnesium and its alloys by metal phosphate conversion coatings. Surf. Eng. 30, 871–879 (2014)CrossRefGoogle Scholar
  14. 14.
    J. Sun, D.X. Du, H.F. Lv, L. Zhou, Y.G. Wang, C.G. Qi, Microstructure and corrosion resistance of pulse electrodeposited Ni–Cr coatings. Surf. Eng. 31, 406–411 (2015)CrossRefGoogle Scholar
  15. 15.
    B.-S. Liu, Y.-H. Wei, W.-Y. Chen, L.-F. Hou, C.-L. Guo, Protective compound coating on AZ91D Mg alloy fabricated by combination of cold spraying with die casting. Surf. Eng. 31, 816–824 (2015)CrossRefGoogle Scholar
  16. 16.
    M.A. Fouad, T.M. Zewail, N.A. Amine, Y.A. El-Tawail, Comparison Between Corrosion Behavior of Copper and Stainless Steel 90 Elbow and Failure Investigation of 90 Copper Elbow. J Inst Eng India Ser C 98(2), 141–145 (2017)CrossRefGoogle Scholar
  17. 17.
    W.S. Rathod, A.S. Khanna, R.C. Rathod, S.G. Sapate, Wear and Corrosion Behavior of CoNiCrAlY Bond Coats. J Inst Eng India Ser C 95(3), 934–942 (2014)CrossRefGoogle Scholar

Copyright information

© The Institution of Engineers (India) 2018

Authors and Affiliations

  1. 1.Mechanical DepartmentNew Horizon College of EngineeringBangaloreIndia

Personalised recommendations