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Alternatives to cadmium plating on fasteners have been evaluated for a number of years. Torque-tension and corrosion resistance characteristics have been the major concerns. Zinc plating has been a popular substitute, but torque-tension at proper preloads on Grade 8 fasteners requires more torque. Torque-tension tests were ALSO evaluated on Grade 5 fasteners - same coatings.
Alternatives to cadmium plating on fasteners have been evaluated for a number of years. Torque-tension and corrosion resistance characteristics have been the major concerns. Zinc plating has been a popular substitute, but torque-tension at proper preloads on Grade 8 fasteners requires approximately 33 percent more torque. Zinc plating with a supplemental phosphate coating in lieu of the typical supplemental chromate coating was evaluated as an alternative to cadmium plating. Torque-tension and salt spray corrosion resistances were determined for Grade 8 fasteners. Torque-tension tests were also evaluated on Grade 5 fasteners with the same coatings. Finally, torque-tension tests were conducted on the different finishes using an automotive lubricant. The results of the tests are presented in the paper.
Key Words: Fastener coatings, cadmium plating, zinc plating, phosphate coating, chromate conversion coating, salt spray (ASTM-B 117) corrosion testing, torque-tension, cadmium plating alternative.
Hot dip galvanizing steel articles after fabrication is one of the most widely used methods to provide corrosion protection. As a final step in the process, the hot dip galvanized coating is inspected for compliance with specifications. Correct measurement techniques and accurate interpretation of the results are necessary to provide an acceptable hot dip galvanized coating.
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Since 1982, there has been a move to Thermal Sprayed Aluminum (TSA) coating in the “splash zone” of offshore structures. Our experience indicates that an experience applicator, good surface preparation and quality of wire combined to achieve required thickness and apply the sealer to seal the entire surface.
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