Aircraft coating

The aluminum alloys used for aircraft construction are pretreated by anodizing, chromating, application of wash primer (6-8 pm), or pickling. 

Anticorrosive primer formulations are based on epoxy resins that react at ambient temperature with amine adducts, aminoamide resins, or isocyanates (two-pack primers). Zinc or strontium chromates are used as anticorrosive pigments. These electrolytically active pigments prevent dangerous filiform corrosion. Extensive development work is being carried out on chromate-free aircraft primers [11.8], [11.9]. 

Aircraft coatings normally consist of two coats. The topcoat used for civil aircraft is a high-gloss two-pack polyurethane product, cured with aliphatic isocyanates. Single-coat systems based on thermoplastic acrylic resins have been used for military aircraft, but are being replaced by polyurethane topcoats [11.10]. 

The requirements of any coating system are determined by its in-use environment (service, construction, or maintenance). The sea is wet, salty, usually oxygenated. 

The requirements of marine coatings may therefore be considered under the following headings  

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Inhibitive Primers. The traditional primers are red lead and linseed oil, alkyd resins and zinc potassium chromate, proprietary epoxy, alkyd, urethane and latex systems with modified phosphate, borate and molybdate pigments. Chromate-based pigments, although in use in aircraft coatings, automotive primers and coil coating primers, are subject to environmental concern on the toxicity of hexavalent chromium which is likely to result in their replacement by innocuous products. 

Uses Curing agent tor architectural and industrial maintenance coatings, concrete floor, and aircraft coatings... 

Guseva, O., S. Brunner, and P. Richner (2003). Service life prediction for aircraft coatings. Polymer degradation and stability S2, 1-13. 

Our work aims to developed a scientific and engineering background in the production of Nickel boron alloys (NiB) which can be used as a brazing material, wear-corrosion-oxidation resistive applications via carbothermic reduction that is the effective and attractive process technique regarding high mass of production for industry such as brazing, automotive, electronics, aircrafts, coatings etc. 

A.K. Chattopadhyay and M.R. Zentner, Aerospace and Aircraft Coatings, Federation Series on Coatings Technology, Federation of Societies for Paint Technology, Philadelphia, PA, 1990. 

Applications - automotive, aircraft, coatings, composites, electronics, fiber, food, medical, oil gas, textiles ... 

Barrow D. Applications of sol-gel ceramic coatings. Key Eng. Mater. 1996 122 124 443-450 Bierwagen G. Next generation of aircraft coatings systems. J. Coat. Technol. 2001 73(915) 45-52 Biswas R.G., Woodhead J.L., Bhattacharaya A.K. Corrosion studies of inorganic sol-gel alumina coatings on 316 stainless steel. J. Mater. Sci. Lett. 1997 16 1628-1633 Bockris J.O.M., Reddy A.K.N. Electroqufmica moderna Vol. II, 1st ed. Reverte, S.A., Barcelona (Espana), 1980... 

Evans, M. A statistical degradation model for the service life prediction of aircraft coatings with a comparison to an existing methodology. Polym. Test 31, 46-55 (2012)... 

SEM images of MWCNTs dispersed into epoxy primer used for aircraft coating. 

Osborne, J. H. EXi, J. Nercissiantz, A. Taylor, S. R. Bernard, D. Bierwagen, G. R "Advanced Corrosion-Resistant Aircraft Coatings, prepared under contract no. F33615-96-C-5078," Dayton, OH, Wright-Patterson AFB, Air Force Material Command, 2000. 

An analysis was made of a flat aircraft coating using secondary ion mass spectroscopy, which revealed that the coating was a polyurethane C type based on isophorone diisocyanate, diethylene glycol and adipic acid. X-ray photoelectron spectroscopy was employed to determine pigments and extenders. 10 refs. 

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