GMW7114 保护性表面处理-有机磷酸锌类.pdf

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GENERAL MOTORS ENGINEERING STANDARDS
Materlals and Processes-metals
CORROSION PROTECTIVE COATINGS PHOSPHATE/ZINC/ORGANIC
TYPE
GM7114M
1 SCOPE This specifcation covers the basic require- 3.4.1 For initial approval and PPAP submissions parts must
ments for a non-oily corosion pro ective coating consisting of be ested per SAE/US AR-1 to meet the corrosion resistance
zinc phosphate treatment, zinc rich inorganic resin coating and requiements when sampled per ANSIASME B1818. 2M
aluminum rich organic topcoat.
1.1 The coating is suitable for extemally threaded and non
3.4.2 For normal production, processes that are in statistical
threaded fe
ferrous parts where high levels of corrosion process control shall yield parts that are capable of meeting the
protection and freedom from hydrogen embrittlement are
alt spray requirements
equired. When applied over steel that is to be coupled to alu
3.4.3 For statistical process control, a NSS test of the parts
This coating is not recommended for inemally threaded pars being prcessed on each in ning this coating shall be con.
and
with recess drives
ducted per ANSIASME B1818.2M, Appendix 1, Table B
except sample size of 3 pieces minimum per line per shift.
1.2 Use of this finish on threaded surface and/or bearing sur-
face of joins could affect the orque-tens on relationship. It is 3. 4.4 ince his coating is not included in the list of finishes
recommended that a torque-tension study of the fastener joint in Table B acual conrol checks shall be based on the chemi.
be performed before releasing this finish on a new application. cal manufacturers instructions. Supplier shall maintain the test
2 REFERENCED STANDARDS
results in the file to be submitted when required by GM
3.4.5 Significant surfaces for test evaluation include but are
GM500M
GM4465P
not limited to fastener head socket recess, sems washer and
GM510M
GM9064P
extemal nut surface, Sharp edges are excluded. The significant
GMI000M
GM907IP
surfaces on threaded fasteners are exposed surfaces, excluding
GM4298P
ANSTASME B1818.2M
threads when the fastener is in installed position.
GM4345M
SAE/USCAR-
3.4.6 Significant sufaces on parts other than threaded faster
3 REQUIREMENTS
ers shall be all surfaces excluding sharp edges
(GM1000M). A materials supplied to this specification must
3. 5 FLEXIBILITY AND CHIP RESISTANCE. The coating
comly with the requirements st n GM1 M Resited must w tand he omma extensions, flexing and compres
and Reportable Chemicals
sions encountered by springs and spring clips during end
product assembly, without evidence of flaking or loss of adhe
3.2 APPEARANCE. The coatin hal have a uniform ry sion from the base metal. It shal withstand normal handin
appearance and shall be free from tears, sags, and excess coat. and storage conditions without chipping or flaki
m的
ing which affects appearance and performance. The coating
tacky to the touch. During normal handling 3.6 ADHESION CHARACTERISTICS. Parts coated to this
practice, parts
hands, or gloves.
specification shall show no evidence of blistering or other
appearance changes, other than a whitish blush, after exposure
3. 3 THICKNESS. When a