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Subject: Low Hydrogen Embrittlement (LHE) Zn-Ni Alloy Plating

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 method to Cadmium-Titanium Alloy Plating BAC 5804.

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

BAC 5680 establishes the requirements for the electro-deposition of a zinc-nickel alloy containing 5 to 15 percent nickel. Plating within the scope of this specification is intended for use on low alloy steels heat treated to 220 ksi and above. Other zinc-nickel alloy plating specifications may not be used in lieu of this specification. This specification requires Qualified Processors. Processors shall be qualified in accordance with Section 13, and shall be listed in the QPL.

The acid plating process and the acid bath chemistry 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

The information contained herein is PROPRIETARY to The Boeing Company and shall not be reproduced or disclosed in whole or in part or used for any purpose except when the user possesses direct, written authorization from The Boeing Company.

Process Step Notes for BAC 5680 LHE Zinc-Nickel Alloy Plating
Facilities: The presence of organic material in the plating tank or associated plumbing will affect the quality of the plating.
Manufacturing: Failure to turn off all solution agitation system(s) may result in hydrogen embrittlement of the parts.
Maintenance: Zinc oxide dissolution in hydrochloric acid can produce a large amount of heat. Degradation of the zinc anodes and/or excessive zinc concentration may result if the anodes are left in the plating bath.

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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