Ionic Transport Through Metal-Rich Organic Coatings
Abstract
Organic coatings are commonly used on aircraft and in the automotive industry to protect against corrosive environments. Although coatings are frequently used today, the mechanisms behind their protective nature are not fully understood. This paper investigates how metal particle volume (MPV) percent, solvent polarity, and resin molecular weight impact corrosion protection of metal-rich organic (MRO) coatings. Following design of experiments (DOE) and Taguchi methodologies, the three parameters investigated, along with their respective levels, were used to generate an orthogonal test matrix of coating formulations. Due to the brittle nature of the coatings, these formulations could not be stand-alone and were sprayed onto filter paper to lend structural support. Using a modified Hitorff cell, the nine independent formulations from the orthogonal matrix were tested for pH and chloride ion concentration levels over time. As the corrosion protection of the coating decreases, chloride ion concentration will increase. Preliminary tests indicate that the effects of MPV percent, solvent polarity, and resin molecular weight can be measured using a modified Hitorff cell set-up, however, no trends can be determined from the data at this time.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 19, 2016
- Accession Number
- AD1015484
Entities
People
- Anna K. Safigan
- Brandy Mobley
- Kevin M. Cook
- Noah Wichrowski
- Victor Rodriguez-santiago
- Zachary Nega
Organizations
- Naval Air Warfare Center