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Document DELPHI DX550800 is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
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DELPHI DX550800 Document Information:
Title
CORROSION PROTECTIVE COATINGS - FLUORCARBON TYPE
Delphi Automotive Systems
Publication Date:
Feb 1, 2006
Scope:
This specification covers the basic requirements for
fluorocarbon post treatments. These coatings are suitable for
simple formed metal parts, castings, fasteners, clips, and other
ferrous parts that are not adversely affected by curing
temperatures in the range of 150 to 210°C. These coatings may also
be used to reduce friction and wear on mating surfaces or as an
anti scuff type finish. All surface treatments and post treatments
shall be hexavalent chromium free.
The specification number shown in the title is a generic number
for fluorocarbon post treatments. Table 1 shows the specification
numbers to be used on the drawings and reflects the basic
requirements of the specification
Drawing call out example: DX550801 per DX550800
This example from Table 1 indicates a fluorocarbon coating that
is 18 micrometers (um) thick and able to withstand 336
hours neutral salt spray without evidence of base metal corrosion.
The presence of a suffix after the specification number (example:
DX551801-F) indicates an approved source supplemental qualification
requirement, as described in Section 11.
The coating can be applied over any combination of zinc
phosphate, zinc plate, iron phosphate or grit blast pretreatments.
Substrate pretreatment requirements, where they exist, are to be
shown separately on drawings or applicable documents.
Fluorocarbon coatings are not recommended for fasteners with
internal recesses (e.g. Torx/Phillips) because of potential coating
built up in recesses.
Fluorocarbon coatings are not recommended for screw/washer
combinations due to screw to washer adhering.
Use of this finish on threaded surface and/or bearing surface of
joints could affect the torque-tension relationship. It is
recommended that a torque-tension study of the fastener joint be
performed before releasing this finish on a new application.
Black fluorocarbon coatings should not be specified on zinc or
aluminum threaded fasteners larger than 12 mm in diameter, due to
objectionable appearances that may result.
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