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DELPHI DX551200 Document Information:
Title
CORROSION PROTECTIVE COATINGS – HEXAVALENT CHROMIUM FREE ZINC PLATING
Delphi Automotive Systems
Publication Date:
Apr 1, 2009
Scope:
This specification describes the basic requirements for
electroplated zinc coatings on iron and steel substrates. The basic
requirements may include: minimum plating thickness, zinc surface
treatments (e.g. trivalent chromium conversion coating), typical
appearance, and salt spray resistance of either the base metal
and/or the zinc plating to the appearance of corrosion products.
All zinc surface treatments and post treatments shall be hexavalent
chromium free.
The specification number shown in the title is a generic number
for the different zinc plating finishes. Table 1 shows the
specification numbers to be used on the drawings and reflects the
basic requirements of the specification.
Drawing call out example: DX551207 (8K240/96G) per DX551200
This example from Table 1 indicates a zinc plating with a 8
micrometer minimum thickness that has a zinc surface treatment. The
coating must withstand a minimum of 240 hours neutral salt spray
without evidence of base metal corrosion (red rust) and a minimum
of 96 hours neutral salt spray without evidence of zinc corrosion
products (white rust). A general clear topcoat is added to enhance
corrosion resistance. The presence of a suffix after the
specification number (example: DX551207-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.
Some colors are typically obtained by the use of specific zinc
surface treatments, post-treatments or color dyes.
The use of zinc plating and related finishes described in this
specification 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 the specified plating and finishes for
use on new threaded applications. See Table 2 of this
specification.
Zinc plated parts or their corrosion products should not come in
contact with stressed Polyamides 6 or 66.
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