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Technical Paper

Zn-Ni Plating as a Cadmium Alternative

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.
Technical Paper

Wear Protection of Engine Parts at High Temperatures by a Co+Cr2O3 Dispersion Coating

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.
Technical Paper

Ventilation Designed to Control Contaminants—Not Exhaust Dollars

The buzz words of the 70s - Energy Shortage - have been replaced by the buzz words of the 80s - Rate Shock. As new electric generating plants come on line, the aircraft plating industry, along with the rest of the public, is seeing huge increases in their electrical energy costs. While many of these costs, such as electrical energy for rectifiers, are fixed by the process, other large costs, such as power ventilation requirements to comply with the Occupational Safety and Health Administration (OSHA) Regulations, are not unalterable. Designing an economical ventilation system does not mean compromising the worker’s safety nor violating OSHA requirements. Rather, OSHA guidelines specifically outline methods of reducing the ventilation requirements. This paper investigates several of these alternatives, including adequate hood design, push-pull ventilation systems, covering the process solution and operational methods that can greatly reduce the ventilation requirements.

Valve, Inflation, Aircraft Wheel

This SAE Aerospace Standard (AS) defines the configuration of aircraft wheel inflation valve assemblies, including required tolerances, materials, and appropriate finishes.
Technical Paper

Value Engineering of Contamination Control

With the ever increasing competition among companies to reduce manufacturing costs without sacrificing product reliability, Bendix-Pacific has engaged the use of Value Engineering in establishing contamination control on manufactured components. The process of establishing contamination control begins before the contract has been awarded. The program proceeds along the following lines: First, a foundation of sound comprehensive methods and procedures fully documented internally. Second, the application of Value Engineering to the Customer design and performance specifications. Third, the alternate proposal showing the logic and reasoning supporting the proposal. Fourth, the implementation of the proposal to the contract. And fifth, the documentation of records for the program. The important factor to remember is that, “contamination control is mandatory for system reliability, however, unrealistic levels of contamination control can only result in a gold plated product.”

ULD for Aircraft Transportation of Horses

This SAE Aerospace Recommended Practice (ARP) defines minimum requirements for an aircraft transport ULD to transport horses properly and safely by air, to protect the horse(s) from injuries, and to protect the aircraft from corrosion created by waste spill. The ULD is designed to accommodate one horse or several. There are two types of ULDs for aircraft transportation of horses: