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Chemical Reactivation of Exterior Decorative Aerospace Livery Coatings

Exterior decorative aerospace livery coatings are designed to be resistant to UV degradation as well as inert to a variety of aggressive solvents and airplane fluids to ensure adequate protection of the airframe. These coatings are also used to project a commercial airline’s identity using multiple overlapping colors in complex designs

Product Number: 41213-732-SG
Author: Douglas H. Berry
Publication Date: 2013
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Exterior decorative aerospace livery coatings are designed to be resistant to UV degradation as well as inert to a variety of aggressive solvents and airplane fluids to ensure adequate protection of the airframe. These coatings are also used to project a commercial airline’s identity using multiple overlapping colors in complex designs. Consequently, a surface preparation procedure is necessary that provides excellent intercoat adhesion as the stresses experienced by leading edges of aerospace paint layers are quite severe due to impacting rain drops during flight. Historically, the only viable method to prevent de-bonding of cured paints has been to mechanically abrade (sand) prior to the application of subsequent coating layers. However, sanding is a time consuming, ergonomically hazardous process. Chemical reactivation, using a newly developed adhesion promoter based on alkoxide sol-gel technology, has proven to be a viable alternative and has been successfully implemented on multiple aerospace platforms. This paper discusses analytical tests used to develop and understand the chemical reactivator, and performance tests, such as rain erosion, used to qualify the chemical reactivator.

Exterior decorative aerospace livery coatings are designed to be resistant to UV degradation as well as inert to a variety of aggressive solvents and airplane fluids to ensure adequate protection of the airframe. These coatings are also used to project a commercial airline’s identity using multiple overlapping colors in complex designs. Consequently, a surface preparation procedure is necessary that provides excellent intercoat adhesion as the stresses experienced by leading edges of aerospace paint layers are quite severe due to impacting rain drops during flight. Historically, the only viable method to prevent de-bonding of cured paints has been to mechanically abrade (sand) prior to the application of subsequent coating layers. However, sanding is a time consuming, ergonomically hazardous process. Chemical reactivation, using a newly developed adhesion promoter based on alkoxide sol-gel technology, has proven to be a viable alternative and has been successfully implemented on multiple aerospace platforms. This paper discusses analytical tests used to develop and understand the chemical reactivator, and performance tests, such as rain erosion, used to qualify the chemical reactivator.

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