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Metal finishing Seals and gaskets Aerospace

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Technical Paper

Zn-Ni Plating as a Cadmium Alternative
2007-09-17
2007-01-3837
In a 2-year program sponsored by SJAC, an aqueous electroplating process using alkaline Zn-Ni with trivalent chromium post treatment is under evaluation for high strength steel for aircraft application as an alternative to cadmium. Commercial Zn-15%Ni rack/barrel plating solutions are basis for plating aircraft parts or fasteners. Brightener was reduced from the original formula to form porous plating that enables bake-out of hydrogen to avoid hydrogen embrittlement condition. Properties of the deposit, such as appearance, adhesion, un-scribed corrosion resistance, and galvanic corrosion resistance in contact with Al alloy, were evaluated. Coefficient of friction was compared with Cd plating by torque-tension measurements. Evaluation of the plating for scribed corrosion resistance, primer adhesion, etc. will continue in FY2007.
Standard

ZINC PLATING
1991-10-01
HISTORICAL
AMS2402F
This specification covers the engineering requirements for electrodepositton of zinc and the properties of the deposit.
Technical Paper

Wear Protection of Engine Parts at High Temperatures by a Co+Cr2O3 Dispersion Coating
1985-02-01
850704
Co+Cr2O3 is a composite coating of a cobalt matrix with 30 percent by volume embedded Cr2O3. The coating can be applied by plating using a suspension of Cr2O3 in a cobalt electrolyte. The mechanical properties of this coating are discussed. The main attribute is the excellent wear resistance of the coating especially in the temperature range of 300 to 700°C. Adhesive wear of unplated counterparts is reduced by the same amount. In contrast to nickel the fatigue strength of Co+Cr2O3 coated Waspaloy was shown to be not influenced, when heat treated at 400°C for 16 hours. Plated engine parts demonstrate the usefulness of the Co+Cr2O3 composite coatings for wear protection.
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