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Galvanic black anodizing on Mg-Li alloys

Abstract

A process of galvanic black anodizing on Mg-Li alloys was studied. The influence of various operating parameters, namely galvanic current density, voltage, pH, electrolyte concentration, operating temperature, anodizing time and heat treatment on the anodic film formation have been investigated to optimize the process. The deposits were characterized by optical and scanning electron microscopy, adhesion tests, corrosion studies, thickness measurement and microhardness evaluation. The space worthiness of the coatings has been evaluated by humidity, thermal cycling and thermovacuum tests and measurement of optical properties. The results of all these studies are clearly indicative that the black anodizing process described herein is extremely suitable for ground, as well as space, applications.

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Abbreviations

s :

Solar absorbance

εir :

Infrared emittance

VHN :

Vickers hardness number

References

  1. [1]

    J. McDonald,Trans, ASM 61 (1968) 505.

  2. [2]

    Idem, J. Inst. Metals 97 (1969) 353.

  3. [3]

    Idem, ibid. 99 (1971) 24.

  4. [4]

    A. K. Sharma,Met. Finish. 89 (July 1991) 16.

  5. [5]

    Idem, ibid. 87 (Feb 1989) 73.

  6. [6]

    Idem, ibid. 86 (Dec 1988) 83.

  7. [7]

    Jack Kindler, ‘Chromate Conversion coatings’, American Electroplaters' Soc. Inc., FL (1986) p. 6.

  8. [8]

    L. J. Durney (Ed.) ‘Electroplating Engineering Handbook’ Van Nostrand Reinhold, New York (1984) p. 390.

  9. [9]

    A. K. Sharma,Thin Solid Films 208 (1992) 48.

  10. [10]

    N. R. Short, J. K. Dennis and S. O. Agbonlahor,Trans. Inst. Met. Finish. 66 (Aug. 1988) 107.

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Sharma, A.K., Rani, R.U., Bhojaraj, H. et al. Galvanic black anodizing on Mg-Li alloys. J Appl Electrochem 23, 500–507 (1993). https://doi.org/10.1007/BF00707629

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Keywords

  • Microscopy
  • Electron Microscopy
  • Scanning Electron Microscopy
  • Physical Chemistry
  • Heat Treatment