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GMW GMW3359 Document Information:
Title
Non-Electrolytically Applied Zinc Rich Coating
GM Worldwide
Publication Date:
Sep 1, 2007
Scope:
This standard covers the basic requirements for a corrosion
resistant non-electrolytically applied zinc rich coating. Besides
corrosion protection, the coating also provides color
identification and lubrication by using an additional topcoat with
integrated lubricant such as wax or polytetrafluoroethylene
(PTFE).
Material Description.
The material to this specification covers organic or inorganic
zinc flake coating with and without organic topcoat. This coating
system must be free of hexavalent chromium, with no hexavalent
chromium in final product per GMW3059 requirements. GMW3034 will be
used as a referee test. This coating process does not generate
hydrogen; however, pretreatment processes, i.e., acid pickling
could cause hydrogen adsorption. Non-electrolytically applied zinc
rich coating has high permeability, which allows effusion of
hydrogen during curing which might have been absorbed during acid
pickling.
Typical Applications.
This coating is suitable for externally and internally threaded
parts (size greater than or equal to M6) and non-threaded ferrous
parts where high level of corrosion protection and freedom from
hydrogen embrittlement are required. This is not recommended for
the following:
Bolts and nuts of sizes less than M6.
Parts with internal drive recess.
Against magnesium surfaces.
Loose washers of all sizes.
Parts where electrical conductivity is required.
Remarks.
Use of this coating system 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 any new application.
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