Journal of Advanced Materials in Engineering

Journal of Advanced Materials in Engineering

The Effect of Pigment Material on the Optical Absorbance, Emittance, and Wear Resistance of Black Anodized Coatings: A Case Study on 7075 Aluminum Alloy

Document Type : Original Article

Authors
A. Nourmohammadi Abadchi 1
S. H. Hashemi Rizi 1
M. Forghani 2
1 Department of Nanotechnology, Faculty of Chemistry, University of Isfahan, Isfahan, 81746-73441, Iran
2 Materials and Energy Research Institute
10.47176/jame.42.2.1018
Abstract
Producing ideal black coatings with optical absorption and emission followed by desirable wear resistance is crucial for various applications such as space applications. A suitable method for producing these coatings is anodizing aluminum alloys followed by black dying the produced anodic coatings using black organic or inorganic pigments. It is necessary to investigate and optimize the effect of the process parameters to maximize the optical absorption, emission, and the wear resistance of the coatings. These issues have been addressed in this research, and the influence of process parameters and type of pigment has been studied to maximize the absorptivity, emissivity, and the wear resistance of the coatings. For the first time, the effect of pigment on the absorptivity, emissivity, and wear resistance of the coatings was investigated. Unexpectedly , it was observed that the type of pigment had a significant effect on the optical and mechanical properties of the coatings. It was also found that in the anodic coatings containing inorganic pigment, absorptivity increased from 0.85 to 0.95, the emissivity increased from 0.82 to 0.91, and weight loss value in pin‐on‐disk wear test decreased from 6 to 2 mg with increasing the anodizing time from 15 minutes to 45 minutes. In contrary, slight improvement was observed in the coatings containing organic pigments. Despite increasing the anodizing time in the latter case, the absorptivity, emissivity, and the weight loss during wear test changed insignificantly.
Keywords
Black anodizing
Pigment
Optical absorbance
Emittance
wear resistance
Subjects
  1. daSilva Mattos W, Rivolta B, Totten G, Meekisho L, deCampos Franceschini Canale L. Encyclopedia of Aluminum and Its Alloys. First Edition. Taylor and Francis; 2018.
  2. Kromet International Inc. What is Anodizing? [Internet]. Canada: N1R 7K1; 2023. Available from: http://www.kromet.com/anodizing.html.
  3. Sharifi H, Aliofkhazraei M, Darband GB, Shrestha S. A review on adhesion strength of peo coatings by scratch test method. Surface Review and Letters. 2018 Apr 25;25(03):1830004.
  4. Mondolfo LF. Aluminum alloys: structure and properties. Elsevier; 2013 Sep 24.
  5. Sharma AK. Surface engineering for thermal control of spacecraft. Surface engineering. 2005 Jun 1;21(3): 249-53.
  6. Runge JM. The metallurgy of anodizing aluminum. Cham: Springer International Publishing; 2018.
  7. Ebrahimi F, Yazdi SS, Najafabadi MH, Ashrafizadeh F. Influence of nanoporous aluminum oxide interlayer on the optical absorptance of black electroless nickel–phosphorus coating. Thin Solid Films. 2015 Oct 1;592:88-93.
  8. Poinern GE, Ali N, Fawcett D. Progress in nano-engineered anodic aluminum oxide membrane development. Materials. 2011 Feb 25;4(3):487-526.
  9. Hashemi Rizi SH, Nourmohammadi Abadchi A, Effect of multi-step anodizing methods on the optical absorption of black coatings on 2024 aluminum alloy. Scientific research journal of advanced materials in engineering. 2022;40(4):15-28. ‎(In persion)
  10. Methods AT. Standard Test Method for Wear Testing with a Pin-on-Disk Apparatus1. Wear. 2011;5:1-5.
  11. Körte K, inventor; Clariant Finance BVI Ltd, assignee. 1: 2 chromium complex dyes, the production and use thereof. United States patent US 6,210,448. 2001 Apr 3.
  12. Bloxsome N. FOCUS ON CLARIANT. Aluminium International Today. 2019;32(1):51-2.
  13. Suzuki Y, Kawahara K, Kikuchi T, Suzuki RO, Natsui S. Corrosion-resistant porous alumina formed via anodizing aluminum in etidronic acid and its pore-sealing behavior in boiling water. Journal of The Electrochemical Society. 2019 Jul 2;166(12):C261.
  14. ASTM E. 903-96 Standard Test Method for Solar Absorptance. Reflectance and Transmittance of Materials Using Integrating Spheres, reapproved. 2007., https://www.astm.org/e0903-20.html.
  15. ASTMe E408-13. Standard Test Methods for Total Normal Emittance of Surfaces Using Inspection-Meter Techniques. West Conshohocken, PA: American Society for Testing Materials., https://www.astm.org/e0408-13r19.html.
Journal of Advanced Materials in Engineering
Volume 42, Issue 2
Summer 2023
Pages 15-27

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