DELPHI DX900028 TEST FOR EVALUATING ZINC PHOSPHATE COATING
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DELPHI DX900028 Document Information:
Title
TEST FOR EVALUATING ZINC PHOSPHATE COATING
Delphi Automotive Systems
Publication Date:
Jun 1, 1999
Scope:
This standard provides three versions of a test for rapidly evaluating
the integrity of zinc
phosphate coatings on steel.
The test is commonly referred to as the "Ferrotest". It was initially
developed for verification of
the quality of newly phosphated automobile body sheet metal, while the
car parts remain on the
phosphate-to-paint production line. Successful use for this purpose
led to adaptation of the test
principles to verification of the quality of newly phosphated small
parts (such as bolts, nuts and
clips), as parts are dumped from the processing barrel. Control of
quality at this point in the
production cycle permits necessary corrections to be made in the
phosphating system before large
quantities of defective parts are produced. Another adaptation of the
test has been found useful
for verifying the quality of the phosphate portion of the phosphate
and oil type finishes on small
parts, where the recipient of the parts is located at some distance
from the phosphating operation.
(For further discussion of the Ferrotest, see the Journal of Paint
Technology, 41, No. 531, pp. 259
to 265, 1969.)
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