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Document DELPHI DX550900 is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
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DELPHI DX550900 Document Information:
Title
AUTODEPOSITION PRIMER (DIP PROCESS) FOR STEEL AND GALVANIZED (ZINC) SUBSTRATES
Delphi Automotive Systems
Publication Date:
Jul 1, 2007
Scope:
This specification covers the requirements for a black,
waterborne autodeposition coating suitable for use on underhood,
chassis and interior steel or galvanized steel components.
Autodeposition should not be specified
for aluminum substrates or aluminized steel. Application is by
immersion of thoroughly cleaned steel. Maximum corrosion protection
is afforded by the coating's ability to form on any surface that
can be wet. No zinc phosphate or other conversion precoating is
required. All rinses, coatings, and topcoats shall be hexavalent
chromium free.
The specification number shown in the title is a generic number
for an autodeposition primer finish. Table 1 shows the
specification numbers to be used on drawings and reflects the
characteristics, test methods and various requirements of each
finish.
Drawing call out example: DX550903 per DX550900.
This example from Table 1 indicates a coating applied to bare
steel with a thickness between 20.3 and 25.4 micrometers. The
coating must meet all of the requirements of DX650059 A336.
GRADES
Three (3) grades of autodeposition coating are available and are
defined herein as Grades A, B and C. In deciding between the 3
grades of autodeposition, it should be recognized that Grade A has
volatile organic content (VOC's) and thus, DX550901 and
DX550902 are considered to be obsolete and should not be specified
on new applications. All grades are suitable for
components whose intermittent and continuous service temperature is
below 120°C.
Grade A is a low VOC (Volatile Organic Content) water based
material with some solvent and has a cure temperature of 180 to
200°C. This grade is generally used without subsequent topcoating;
however, compatible topcoats may be used if acceptable performance
is verified prior to production usage.
Grade B is a water based material with zero VOC. This material
oven cures in the range of 105 to 115°C. Grade B can also be hot
water cured at 85 to 100°C; however, oven curing is preferred. This
grade is generally used without subsequent topcoating; however,
compatible topcoats may be used if acceptable performance is
verified prior to production usage.
Grade C is a water based material with zero VOC. This material
oven cures in the range of 105 to 115°C. Grade C is intended for
use in low film build applications that require only moderate
corrosion resistance. This grade is generally used without
subsequent topcoating; however, compatible topcoats may be used if
acceptable performance is verified prior to production usage.
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