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Evaluation of Environmentally Acceptable Multi-Layer Coating Systems as Direct Substitutes for Cadmium Plating on Threaded Fasteners
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English
Abstract
Cadmium has been identified by the United States Army's Tank and Automotive Command as a threat to worker health and the environment. Based on already completed cadmium substitute testing, an evaluation program was conducted to quantify the performance of environmentally acceptable, multi-layer coatings that could be directly substituted for cadmium on threaded fasteners. The performance issues investigated included coating system lubricity and corrosion control performance. Data were generated from both natural marine atmosphere exposure tests and laboratory evaluations. Test specimens were prepared by applying sacrificial plating layers and lubricous topcoat materials to commercially available 1/2-20 UNC Fine, Grade 5 fasteners. Experimental analyses included realistic torque-tension curve development, marine atmosphere exposure testing, and ASTM B 117 salt fog evaluations. Program findings indicate that ASTM B 633 zinc coatings (without the Type II or III chromate passivation treatment) exhibited torque tension behavior that was directly comparable to that of the cadmium experimental controls. Corrosion control performance test results indicated that regardless of underlying plating chemistry, systems topcoated with Everlube 6108 performed as well as the cadmium experimental controls.
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Authors
Citation
Ingle, M., Handsy, I., and Schorr, B., "Evaluation of Environmentally Acceptable Multi-Layer Coating Systems as Direct Substitutes for Cadmium Plating on Threaded Fasteners," SAE Technical Paper 932348, 1993, https://doi.org/10.4271/932348.Also In
References
- Department of Labor, Occupational Safety and Health Administration Occupational Exposure to Cadmium; Final Rules; Code of Federal Regulations, Title 29, Part 1910.1027 September 14 1992
- The Swedish Ban on Cadmium, National Swedish Environmental Protection Board Information Unit 91-620-3446-4 1988
- Finland Products Containing Cadmium and its Compounds, Commerce Business Daily Announcement November 25 1992
- Ingle M. Marchesani T. Proceedings of the 5th Automotive Corrosion and Prevention Conference SAE P-250 1991
- Groshart E. C Boeing Defense and Space Systems Corp. Presentation to the Army Environmentally Acceptable Materials Treatments and Processes Program Quarterly Program Review Meeting August 1, 1991
- Monaghan J. M. Journal of Strain Analysis 26 2 1991
- Parmley R. O. Standard Handbook of Fastening and Joining McGraw-Hill Inc. 1989