Wear Behaviour of Polyurethane Coated Aerospace Aluminium Alloy (7075)

Abstract:

This paper envisages to predict the life of an aircraft coating using high strength precipitation hardening 7000 series aluminum alloys, such as 7075 which is used extensively in aerospace industry. Aerospace aluminum alloy 7075 has been researched upon especially for aircraft materials. The intention of protective coating is to save the aerospace aluminium alloy 7075 metal surface from weatherability and, at the same time, to obtain the required degree of cosmetic finish for the object. One was epoxy polyamide as primer layer and other was the polyurethane as top-coat layer of coating through conventional spray type on aluminum alloy 7075 substrates. Epoxy polyamide is useful binders for aircraft primers. Top-coats have also been prepared, but polyurethane is still the choice for aircraft coating. This coating system is typically comprised, of a primer layer and a topcoat layer. The ability of the polyurethane coating is to prevent corrosion, weatherability depends on its anti-corrosive pigments and its adhesion to the substrate. All these factors are widely variable with the geographic location and season such as temperature, wind, oxygen and atmospheric pollutants. The effect of structural and process variable on wear resistance of polyurethane coating was analyzed to determine the maximum wear rate using DOE software optimum samples were prepare according to best level of each factor and its morphology was examined by scanning electron microscope (SEM).

• Periodical: Applied Mechanics and Materials (Volumes 813-814)
• Pages: 252-256
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.813-814.252
• Online since: November 2015
• Authors: T. Vijayakumar, T. Senthilvelan, R. Venkatakrishnan
• Keywords: Aluminium 7075, Coating Layer, Polymer, Polyurethane, SEM, Wear

References

[1] Arthur M. Usmani, Mike Donley, Aircraft-Coating Weathering Studies by Analytical Methods, ALTEC USA, Indianapolis, Indiana 46278, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, May-(2000).

[2] Shiwei William Guan, The selection, application and inspection of 100% solids polyurethane coatings for corrosion protection, Vice President, Research & Development, Madison Chemical Industries Inc., 490 McGeachie Drive, Milton, Ontario L9T 3Y5 Canada, November 12-16, 2000, Nashville, Tennessee.

[3] The American Society for Testing and Materials, Standard Test Method for Wear Testing with a Pin-on-Disk Apparatus, patent rights through the ASTM website (www. astm. org).

[4] Lee, G. H., Hwang, H. Y., and Lee, D. G. (2006), Effect of Wear Debris on the Tribological Characteristics of Carbon Fiber Epoxy Composites, Wear, 261(3–4), p.453–459.

DOI: 10.1016/j.wear.2005.12.012

[5] Mate, C. M. (2008), Tribology on The Small Scale: A Bottom up Approach to Friction, Lubrication and Wear, 1st ed., Oxford University Press, New York, USA.

[6] Ronkainen, H., Laukkanen, A., and Holmberg, K. (2007), Friction in a Coated Surface Deformed by a Sliding Sphere, Wear, 263(7–12), p.1315–1323.

DOI: 10.1016/j.wear.2007.01.103

[7] Eiss, N. S. and McCann, B. P. (1993), Frictional Instabilities in Polymer–Polymer Sliding, Tribology Transactions, 36, p.686–692.

DOI: 10.1080/10402009308983211

[8] Nak-Ho, S. and Suh, N. P. (1979), Effect of Fiber Orientation on Friction and Wear of Fiber Reinforced Polymer Composites, Wear, 53(1), p.129–141.

DOI: 10.1016/0043-1648(79)90224-2

[9] Khun, N. W., Liu, E., and Krishna, M. D. (2010).

[10] S. Rajesh, S. Rajakarunakaran, R. Sudhakara Pandian, Modeling and Optimization of Sliding Specific Wear and Coefficient of Friction of Aluminum Based Red Mud Metal Matrix Composite Using Taguchi Method and Response Surface Methodology, Department of Mechanical Engineering, Kalasalingam University, Anand Nagar, Krishnankoil, 626 190, India, Materials Physics and Mechanics 15 (2012).

DOI: 10.1007/s00170-012-4525-1

[11] Hani Aziz Ameen, Khairia Salman Hassan and Ethar Mohamed Mhdi Mubarak, Effect of loads, sliding speeds and times on the wear rate for different materials, Institute of Technology – Baghdad / Mechanical dept. - Iraq, American J. Sci. and Indus. Res. ISSN: 2153-649X doi: 10. 525/ajsir. 2011. 2. 99. 106.

DOI: 10.5251/ajsir.2011.2.1.99.106

[12] Andre.I. Khuri, and Siuli Mukhopadhyay, Response surface methodology, Volume 2, March/April 2010. Reference to a chapter3 in an edited book.