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97548 A COMPARISON OF CADMIUM ELECTROPLATE AND SOME ALTERNATIVES

Picture for 97548 A COMPARISON OF CADMIUM ELECTROPLATE
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Product Number: 51300-97548-SG
ISBN: 97548 1997 CP
Author: Moses Wossene, Roy E. Booth, David L. Hunn, Larry N. McGlaun, John H. Miranda, Steven Twaddle
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In response to the increasing herdth end disposal costs related to the use of cadmium end requests from international customers, it is imperative that alternative coating systems be developed to replace cadmium. With this in mind, the effectiveness of Ion Vapor Deposited Aluminum (IVD/Al), Zinc Nickel (Zn/Ni) and Tin Zinc (Sn/Zn) as environmentally compliant replacements for cadmium was evaluated. Variations of each coating were tested for corrosion resistance, thickness, uniformity, adhesion and torque-tension behavior when applied to steel (DIN) threaded fasteners and flat sheet specimens. Test results indicated that non-chromated IVD/Al coated with a commercially available, lubricious-PTFE formulation exhibited corrosion and torque-tension behavior directly comparable to that of the chromated (conversion coated) cadmium. In addition, it was shown that this combination provided an effective base coat to which organic topcoats would readily adhere. KEY WORDS: DIN Bolts, Ion Vapor Deposition, PTFE, Cadmium Plating, Salt Spray, Adhesion, Lubricity, Torque-Tension, Al, Zinc Nickel, Tin Zinc
In response to the increasing herdth end disposal costs related to the use of cadmium end requests from international customers, it is imperative that alternative coating systems be developed to replace cadmium. With this in mind, the effectiveness of Ion Vapor Deposited Aluminum (IVD/Al), Zinc Nickel (Zn/Ni) and Tin Zinc (Sn/Zn) as environmentally compliant replacements for cadmium was evaluated. Variations of each coating were tested for corrosion resistance, thickness, uniformity, adhesion and torque-tension behavior when applied to steel (DIN) threaded fasteners and flat sheet specimens. Test results indicated that non-chromated IVD/Al coated with a commercially available, lubricious-PTFE formulation exhibited corrosion and torque-tension behavior directly comparable to that of the chromated (conversion coated) cadmium. In addition, it was shown that this combination provided an effective base coat to which organic topcoats would readily adhere. KEY WORDS: DIN Bolts, Ion Vapor Deposition, PTFE, Cadmium Plating, Salt Spray, Adhesion, Lubricity, Torque-Tension, Al, Zinc Nickel, Tin Zinc
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02137 Phosphate Coated Zinc Plating- An Alternative To Cadmium Plating on Fasteners

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ISBN: 02137 2002 CP
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Publication Date: 2002
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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.
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03020 The Many Sides of Cadmium Plating

Product Number: 51300-03020-SG
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