GMW GMW3179 Protective Finishes - Zinc Phosphate Type
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GMW GMW3179 Document Information:
Title
Protective Finishes - Zinc Phosphate Type
GM Worldwide
Publication Date:
Oct 1, 2004
Scope:
This specification covers the basic requirements for corrosion
resistant finishes for iron and
steel substrates whose basic characteristic is zinc phosphate
treatment and subsequent protective
compound. Parts coated with this coating are typically used internally
for engines and
transmissions or in areas where minimum corrosion protection is
required.
Finishes with oil coatings are not recommended to be used against
plastic surfaces.
Material Description. The material approved to this specification
covers zinc phosphate treatments
plus subsequent protective compounds. This coating system must be free
of hexavalent chromium with
no hexavalent chromium in final product per the requirements of
GMW3059. GMW3034 shall be used as a
referee test. This coating process does not generate hydrogen,
however, pretreatment processes i.e.
acid pickling could cause hydrogen absorption. This coating has high
permeability, which allows
effusion of hydrogen during curing which might have been absorbed
during acid pickling.
A grade with zinc phosphate only may be designated or may be followed
by a supplemental coating. A
code system is provided in the Table in Appendix A for designating
certain limitations on
compounds.
Cross-Reference of Replaced Specifications
GMW
Delta Motors
GM do Brazil
GM Holdens
GMNA
ISUZU
ITDC
SAAB
GMW3179
HN1277, HN1278 & HN1279
GM4435M
GME00253
Typical Application This coating is suitable for internally threaded
parts, parts with internal
drive recess, externally threaded and non-threaded ferrous parts where
minimum corrosion protection
and freedom from hydrogen embrittlement are required.
Remarks Use of this coating 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 this finish on any new application.
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