Environmentally Friendly Anticorrosion Coating for High Strength Fasteners
Abstract
There exists a need for environmentally benign coatings to eliminate cadmium and/or chromate containing coatings on high-strength fasteners. These alternative replacement coatings would provide high-strength, corrosion resistant fasteners for use in weapon systems. Traditionally, high-strength steels have been used with cadmium (Cd) electroplated coatings, followed by a hexavalent chromium (Cr6+) rinse. The environmental and human health hazards associated with both cadmium and chromates are well established. The elimination of hazardous materials will improve the life cycle costs and environmental / occupational health issues associated with the manufacture and maintenance of DoD weapon systems. Alternatives to both processes have been pursued with very promising results. This work describes a multi-layer approach to provide a protective coating system. These systems include a sacrificial metal base coat and may also include an organic topcoat technology that will provide the best combination of corrosion resistance and barrier properties. These approaches impart high end sacrificial corrosion resistance properties without use of hazardous Cr or Cd and without hydrogen embrittlement of fasteners.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2011
- Accession Number
- ADA551772
Entities
People
- Mathew Scott