Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
권호 표지
DOI QR코드

DOI QR Code

Corrosion Resistance and Thermo-optical Properties of Lithium Polysilicate Spray Coated Anodized AZ31B Magnesium Alloy for Space Applications

  • Ghosh, Rahul (Thermal Systems Group, U R Rao Satellite Centre, Indian Space Research Organization) ;
  • Thota, Hari K. (Thermal Systems Group, U R Rao Satellite Centre, Indian Space Research Organization) ;
  • Rani, R. Uma (Thermal Systems Group, U R Rao Satellite Centre, Indian Space Research Organization)
  • Received : 2019.09.23
  • Accepted : 2019.10.30
  • Published : 2019.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

A thin spray coating of inorganic black lithium polysilicate (IBLP) on black anodized AZ31B magnesium alloy was fabricated for better corrosion resistance and thermo-optical properties for thermal control of spacecraft components. The morphology of the specimens with and without IBLP-based spray coating was characterized by SEM-EDS techniques. Impedance and potentiodynamic measurements on the specimens revealed better corrosion resistance for the specimen with a thin coating of lithium polysilicate. This was primarily due to the presence of lithium polysilicate inside the micro-cracks of the black anodized specimen, restricting the diffusion paths for corrosive media. Environmental tests, namely, humidity, thermal cycling, thermo vacuum performance, were used to evaluate the space-worthiness of the coating. The thermo-optical properties of the coating were measured before and after each environmental test to ascertain its stability. The specimen with an IBLP-based spray coating showed enhanced thermo-optical properties, greater than ~0.90. Hence, the proposed coating demonstrated better handling, better corrosion resistance, and space-worthiness during the pre-launch phase owing to its improved thermo-optical properties.

Keywords

References

  1. R. F. Decker, Adv. Mater. and Proc., 154, 31 (1998).
  2. J. R. Thomas and L. A. Darryl, Adv. Mater. Proc., 145, 28 (1994).
  3. F. H. Froes, D. Eliezer, and E. Aghion, J. Miner. Met. Mater. Soc., 5, 30 (1998).
  4. E. F. Emley, Principle of Magnesium Technology, 1st ed., pp. 1 - 1034, Pergamon Press, London, UK (1966).
  5. S. R. Agnew and J. F. Nie, Scr. Mater., 63, 671 (2010). https://doi.org/10.1016/j.scriptamat.2010.06.029
  6. X. Chen, G. Li, J. Lian, and Q. Jiang, Appl. Surf. Sci., 255, 2322 (2008). https://doi.org/10.1016/j.apsusc.2008.07.092
  7. L. Li, Y. Cheng, H. Wang , and Z. Zhang, Trans. Nonferrous Met. Soc. China, 18, 722 (2008). https://doi.org/10.1016/S1003-6326(08)60124-7
  8. N. Pebere, C. Riera, and F. Dabosi, Electrochim. Acta, 35, 555 (1990). https://doi.org/10.1016/0013-4686(90)87043-2
  9. G. Baril and N. Pebere, Corros. Sci., 43, 471 (2001). https://doi.org/10.1016/S0010-938X(00)00095-0
  10. G. Baril, C. Blanc, M. Keddam, and N. Pebere, J. Electrochem. Soc., 150, B488 (2003). https://doi.org/10.1149/1.1602080
  11. M. Dabala, K. Brunelli, E. Napolitani, and M. Magrine, Surf. Coat. Technol., 172, 227 (2003). https://doi.org/10.1016/S0257-8972(03)00336-0
  12. L. Bai, D. Li, M. Guo, and J. Xin, Material Sci. Forum, 546-549, 555 (2007). https://doi.org/10.4028/www.scientific.net/MSF.546-549.555
  13. A. K. Sharma, R. Umarani, H. Bhojaraj, and H. Narayanamurthy, J. Appl. Electrochem., 23, 500 (1993). https://doi.org/10.1007/bf00707629
  14. A. K. Sharma, R. Umarani, A. Malek, K. S. N. Acharya, M. Muddu, and S. Kumar, Met. Finish., 94, 16 (1996).
  15. A. K. Sharma, J. Spacecr. Technol., 7, 49 (1997).
  16. J. E. Gray and B. Luan, J. Alloy. Compd., 336, 88 (2002). https://doi.org/10.1016/S0925-8388(01)01899-0
  17. A. K. Sharma, Trans. SAEST, 30, 1 (1995).
  18. B. N. Agarwal, Design of Geosynchronous Spacecrafts, p. 281, Printice-Hall, Englewood Cliffs, NJ (1986).
  19. R. Uma Rani, V. Maria Shalini, Hari Krishna Thota, and A. K. Sharma, J. Coat. Technol. Res., 10, 707 (2013). https://doi.org/10.1007/s11998-012-9466-y
  20. G. Parashar, M. Bajpayee, and P. K. Kamani, Surf. Coat. Int. Pt. B-Coatings Transactions, 86, 209 (2003). https://doi.org/10.1007/BF02699655
  21. A. K. Sharma, R. Uma Rani, and K. Giri, Met. Finish., 95, 43 (1997).
  22. J. Goldstein, D. E. Newbury, D. C. Joy, C. E. Lyman, P. Echlin, E. Lifshin, L. Sawyer, and J. R. Micheal, Scanning Electron Microscopy and X-ray Microanalysis, 3rd ed., pp. 1 - 689, Springer US, Boston (2003).
  23. M. Stern and A. L.Geary, J. Electrochem. Soc., 104, 56 (1957). https://doi.org/10.1149/1.2428496
  24. D. A. Jones, Principles and Prevention of Corrosion, 2nd ed., pp. 1 - 572, Prentice-Hall, Upper Saddle River, NJ (1996).
  25. K. H. Kim, S. H. Lee, N. D. Nam, and J. G. Kim, Corros. Sci., 53, 3576 (2011). https://doi.org/10.1016/j.corsci.2011.07.001