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Subject: Zn-Ni Alloy Plating BAC 5637

Background:
Boeing has a commitment to producing environmentally preferred products. The company actively works to minimize or avoid the use of potentially hazardous materials, including cadmium. Boeing research has been working to identify and test replacements for cadmium-based measures to prevent corrosion. This Zn-Ni alloy plating process is designed to provide an environmentally preferred replacement for cadmium in certain applications.

Description:
BAC 5637 establishes the requirements for the electro-deposition of zinc-nickel alloy plating which is considered a replacement for cadmium with certain restrictions such as threaded parts, steels treated above 220 ksi, and gears. (See the appropriate substitution documents)

Note:
This does not supersede drawings or specification requirements. This information shall not be used for production, test, or acceptance processes.

Caution:
Do not plate steels heat treated to strength levels above 220 ksi (1510 MPa). For steels which are heat treated to strength levels above 220 ksi (1510 MPa), contact the applicable Boeing Engineering organization for verification of callout.

Licensing:
This process and bath are covered by U.S. Patent 4,765,871 and corresponding foreign patents and/or applications. Articles made by this process are covered by U.S. Patent 4,765,871, U.S. Patent 4,818,632 and corresponding foreign patents and/or applications. Patent licenses are available. For further information contact: Director of Licensing Boeing Intellectual Property Business, 15460 Laguna Canyon Road, Irvine, CA 92618 USA.

Process Step	Notes for BAC 5637 Zinc-Nickel Alloy Plating
Facilities:	Mold releases on plastics are detrimental to the plating bath and should not be used when tanks are fabricated. The presence of organic material in the plating tank or associated plumbing will affect the quality of the plating.
Manufacturing:	When the plating tank is inactive for extended periods of time (e.g., 2 weeks), the zinc anodes may be removed from the plating bath to prevent degradation of the zinc anodes, and excessive zinc concentration in the plating bath. Anodes may be stored dry, or in still water. If the anodes become contaminated or are stored outside of the plating bath for a prolonged period of time (e.g., one month or longer) reconditioning in accordance with the procedure described BAC 5637 may be necessary.
Maintenance:	Zinc oxide dissolution in hydrochloric acid can produce a large amount of heat.
Requirements:	Stress relief is required if honing or lapping have been performed after operations listed in Section 11.1b. on applicable alloys and heat strengths. Sequence stress relief before the operations listed in Section 11.1c.(2) to avoid negating the beneficial effects of compressive residual stresses imparted by these operations.

Disclaimer:
The information provided in this website is intended to assist suppliers to the Boeing Company. Although every effort has been made to ensure its accuracy, we cannot warrant its accuracy for use in environmental compliance matters. You should check with your local, state, or Federal regulatory agencies if you have questions regarding the proper procedures or other matter related to compliance.

Safety Reminder:
Refer to Manufacturer's material safety data sheets, or contact the manufacturer for safety and health information pertaining to hazardous materials.

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