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Updated: Feb 16, 2026
08:58
Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
Published on: March 7, 2018
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Novel Chemical Process for Producing Chrome Coated Metal
Christopher Pelar1, Karima Greenaway2, Hugo Zea3
1Naval Postgraduate School, Mechanical and Aerospace Engineering, Monterey, CA 93943, USA. Christopher.Pelar@uscg.mil.
Materials (Basel, Switzerland)
|January 6, 2018
Summary
A new chrome coating process, Cr-RES, creates a micron-scale chrome layer on iron wire. This method avoids carcinogenic hexavalent chrome, offering a safer alternative to traditional electrolytic processing.
Area of Science:
- Materials Science
- Surface Engineering
- Chemical Engineering
Background:
- Electrolytic chrome plating poses health risks due to carcinogenic hexavalent chromium generation.
- Developing safer, alternative methods for chrome coating is crucial for industrial applications.
Purpose of the Study:
- To demonstrate the efficacy of a modified Reduction Expansion Synthesis (RES) process, termed Cr-RES, for creating chrome coatings on iron wire.
- To characterize the properties of the chrome coating produced by the Cr-RES method.
Main Methods:
- Preparation of a paste containing urea, chrome source (nitrate or oxide), and water.
- Coating an iron wire via dipping, followed by drying.
- Heat treatment of the coated wire at ~800 °C for 10 minutes under nitrogen flow.
Main Results:
- Successful formation of a micron-scale chrome metal layer on iron wire, confirmed by SEM and elemental mapping.
- The chrome layer exhibited minor unevenness at the sub-micron scale, with ambiguous evidence of porosity.
- Cr layer thickness correlated with the precursor layer thickness, indicating process control is possible.
Conclusions:
- The Cr-RES process is a viable method for producing chrome coatings on iron wire.
- This technique presents a potential alternative to hazardous electrolytic chrome plating.
- Further research and development are necessary to optimize the Cr-RES process for broader applications.
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