Aviation is an essential mode of transportation facilitating global connectivity and economic growth. However, the industry contributes to environmental pollution in several ways. Aircraft operations release greenhouse gases (GHGs) such as carbon dioxide (CO2), nitrogen oxides (NOx), and water vapor, which contribute to global warming and climate change.
Additionally, aircraft manufacture and maintenance involve chemicals and processes that can harm the environment. Traditional coatings such as paints, primers, and sealants, often contain volatile organic compounds (VOCs) and heavy metals, which pose environmental and health risks.
Eco-friendly engineered coatings are designed to improve aircraft performance during production, application, and throughout the aircraft’s operational life.
Low-VOC and VOC-Free Coatings
VOCs contribute to air pollution, forming ground-level ozone and smog, and have been linked to health problems including respiratory issues and cancer. Low-VOC and VOC-free coatings are designed to reduce these emissions significantly by using water-based formulations or alternative solvents with lower VOC content. In addition to being more environmentally friendly, they also offer performance benefits, such as improved durability and resistance to weathering.
Chromium-Free Coatings
Hexavalent chromium has been widely used in aviation coatings for its excellent corrosion resistance. However, it is highly toxic and carcinogenic, leading to stringent regulations and a push for alternatives. Low/reduced chrome coatings are currently available and widely used. Completely chrome-free coatings are in limited testing and are not yet able to provide the same level of protection as the chrome containing products.
Examples of protective coatings used in aerospace include:
- Ceramic Aluminum Coatings that provide galvanic corrosion resistance and oxidation resistance in an ultra-smooth and lightweight coating
- Topcoats & Sealers that work with ceramic aluminum coatings to reduce porosity and improve surface finish
- Diffusion Coatings capable of providing exceptional oxidation and sulfidation protection
Thermal Barrier Coatings (TBCs)
Traditional TBCs often contain materials that pose environmental concerns during production and disposal. Engineered Ceramic Matrix Composites (CMCs) and other advanced materials can withstand higher temperatures, allowing for improvements in efficiency and parts life, while being more environmentally benign.
Looking Ahead
As the aviation industry continues to grow, investment in the development and implementation of eco-friendly coatings is necessary for the industry to meet evolving aviation regulations, reduce its carbon footprint, and contribute to a more sustainable future.
Investment costs can be offset for eco-friendly aviation industry leaders focused on improving aircraft performance while ensuring compliance with environmental regulations.
PAG Insider: Greg Engleman — General Manager CeralUSA & Qualified Coating Services
