DELPHI DX550073 CORROSION PROTECTIVE COATINGS – HEXAVALENT CHROMIUM FREE TIN-ZINC ALLOY PLATING FOR GROUNDING APPLICATIONS

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DELPHI DX550073 Document Information:

Title
CORROSION PROTECTIVE COATINGS – HEXAVALENT CHROMIUM FREE TIN-ZINC ALLOY PLATING FOR GROUNDING APPLICATIONS

Delphi Automotive Systems

Publication Date:
Feb 1, 2006

Scope:

This specification covers the basic requirements for electrodeposited tin-zinc alloy plating with a subsequent trivalent chromate post treatment. This coating is primarily used for fasteners designated for grounding applications. Sealers and organic topcoats are not permitted, as they could hinder grounding capability. All tin-zinc alloy surface treatments and post treatments must be hexavalent chromium free.

Drawing call out example: DX550073.

The presence of a suffix after the specification number (example: DX550073-F) indicates an approved source supplemental qualification requirement, as described in Section 11.

Specific requirements shown on the part drawing shall take precedence over any requirements in this specification, or may be in addition to the requirements of this specification.

The use of this finish on threaded surfaces and/or bearing surfaces of joints could affect the torque-tension relationship. It is recommended that a torque-tension study of the fastener joint be performed before releasing for use on any new application.

Tin-zinc plated parts or their corrosion products must not come in contact with stressed Polyamides 6 or 66.

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