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Document DELPHI DX551500 is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
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DELPHI DX551500 Document Information:
Title
CORROSION PREVENTATIVE COATINGS - CHROMIUM FREE ZINC-ALUMINUM COATING
Delphi Automotive Systems
Publication Date:
Sep 1, 2007
Scope:
This specification covers the requirements for a chromium free
non-electrolytically applied zinc-aluminum coating on iron and
steel substrates. This coating may be topcoated with organic
sealers to provide additional corrosion protection, color
identification and lubrication. The basic requirements include:
torque @ tension, coefficient of friction, maximum coating
thickness, salt spray resistance, and color
The specification number shown in the title is a generic number
for the chromium free zinc-aluminum coating. Table 1 shows the
specification number to be used on the drawings and reflects the
basic requirements of the specification.
Drawing call out example: DX551501 per DX551500.
This example from Table 1 indicates a coating that provides a
friction modification with a torque of 68 + 8 kN at 28.3 kN tension
and a coefficient of friction of 0.24 + 0.03. The coating must
withstand a minimum of 360 hours neutral salt spray without
evidence of base metal corrosion (red rust). The color will be
silver unless otherwise specified. The presence of a suffix after
the specification number (example: DX551501-F) indicates an
approved source supplemental qualification requirement, as
described in Section 11.
APPLICATION
Depending on the chemicals used, cure temperatures can range
from 220ºC to 330ºC and service temperature resistance can range
from 182ºC to 315ºC. If a particular cure temperature or service
temperature resistance is desired, contact Materials Engineering
for recommendations.
Care should be taken when using these coatings on case hardened
parts or springs. Although higher or lower cure temperatures are
permissible under certain circumstances, corrosion performance
could be affected. Contact Materials Engineering for
recommendations.
This coating is not recommended for use on bolts and nuts
smaller than M4, against magnesium surfaces, on parts with an
internal drive recess, on washers of all sizes or where electrical
conductivity is required.
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