The objective of this Statement of Need (SON) was to develop environmentally benign processes that replace electrolytic chromium and nickel plating used on maraging steel, corrosion-resistant steel, and aluminum alloys in localized areas of weapons system components. The proposed technology should have met the following requirements:
- Eliminates the use of hexavalent chromium and contains low or no volatile organic compounds (VOCs) and hazardous air pollutants (HAPs).
- Does not promote embrittlement in the substrate material.
- Eliminates or reduces part masking, bond coats, and flashings.
- Provides equivalent or better deposition rates as compared to traditional electrolytic plating.
- Is suitable for a wide variety of common military parts and substrates, to include internal and external diameters, surfaces, complex shapes and blind holes, in an economically feasible manner.
- Operates in versatile environments from high volume production floors to portable and unpredictable field conditions.
- Allows for spot repair.
Proposals submitted must have included theoretical or known deposition rate calculations and existing technical and operational performance data to support the concept. The proposer should have considered similar deposited metal technical characteristic requirements, such as but not limited to: Aerospace Material Specification (AMS) 2406, AMS 2460, and AMS QQ-N-290. Technical data required to successfully transition the proposed method or technology was include, but was not limited to: adhesion, hardness, density, porosity content, corrosion, and no (or a minimal and quantifiable) substrate fatigue debit. Other technical issues expected to be addressed for final Department of Defense (DoD) qualification included cleaning, surface preparation treatments and final machining.
Currently the military has limited ability to execute repair operations on low-risk military items, in part, due to the existing state-of-the-art metallic repair process operational, regulatory, and infrastructure footprints. Preference was be given to technologies that advance state-of-the-art and require limited or no new specialized labor skills and are suitable for front line military field or ship-based operations. Approaches requiring substrate heating or extensive post-treatments were not of interest and were not be considered.