• NACE equips society to protect people, assets and
    the environment from the adverse effects of corrosion.
Effect of Mechanical Stress and Environmental Conditions on Degradation of Aerospace Coatings that G
Presenting Author:
Full Name: Fritz Friedersdorf
Parent Company:
Location: Phoenix Convention Center
100 North 3rd St.
Presentation Time: 4/16/2018 @ 10:45 AM
Secondary Authors:
  • Name:Kristen Williams
    Company:
  • Name:David Jackson
    Company:
  • Name:Patrick Kramer
    Company:Luna
Effect of Mechanical Stress and Environmental Conditions on Degradation of Aerospace Coatings that G

Title: Effect of Mechanical Stress and Environmental Conditions on Degradation of Aerospace Coatings that Guard Against Atmospheric Corrosion

 

The most effective means to control atmospheric corrosion of aircraft is through the use of protective coatings.  In addition to combating corrosion which represents a risk to the safe operation of an asset, there are strong economic and environmental drivers to extend the service life of aerospace coatings.  Repair and replacement of exterior coating systems that no longer meet protective requirements generate a significant volume of environmentally hazardous waste, which includes the coating material, media used to for coating removal, as well as the waste materials generated in surface preparation and reapplication the coating system.  Development and use of the most durable coatings systems have often been limited by the ability to predict service performance in accelerated tests.  Existing accelerated test techniques do not adequately employ the chemical, thermal, or mechanical stressors that produce relevant damage mechanisms such as cracking at structural discontinuities in coated airframes.  Additionally, single coating layers may be qualified individually rather than as part of a representative multi-layer stack-up.  As a result, current test methods cannot be used for accurate quantification of coating performance and service life.  In this work, test methodologies previously described that employ combined environmental and mechanical loading modes are utilized to excite relevant failure modes of multi-layer system such as coating cracking at sealant filled lap joints.  The mechanisms and kinetics of damage progression are quantified throughout static and dynamic atmospheric tests using in situ measurements of coating system properties.  It is observed that the coating barrier properties and resistance to cracking at a lap joint are dependent upon both individual effects of stress, temperature, and humidity as well as the combined interaction effects of these stressors.


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