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1、GENERAL MOTORS ENGINEERING STANDARDS COMPOUND, CORROSION PREVENTIVE, HOT MELT, SPRAYABLE 9985529 1 SCOPE. This specification covers the basic rquire- ments for a thermoplastic corrosion preventive compound for application to underbody and chassis components. The corrosion preventive compound is for
2、assembly plant applica- tion over warm (38 to 48 C) metal surfaces by elevated temperature spray (150 to 163 C). The material is applied to a film thickness of 150 elm for low abrasion applications and 300 m for high abrasion applications. The coating shall contain no solvents, no asbestos and shall
3、 be non toxic and non injurious to plant personal. 2 REFERENCE STANDARDS. 3 REQUIREMENTS. 3.1 Physical Properties (see Table 1). 3.2 Performance Requirements (see Table 2). 3.2.1 Test Methods. Test panels for the performance tests are 0.8100300 mm (minimum) unpolished cold rolled body sheet steel. T
4、est are to be duplicated on test panels coated with currently released cathodic ELPO primer. The following notes describe the test requirements were test methods do not exist: GM4298P GM4465P GM9OlOP GM9102P ASTM D92 ASTM D1875 R15-26 SAE 5400 NOTE I: Immerse one half of the test panel in 50 C deter
5、gent solution. The detergent solution is composed of 2.5 g DuPont $.$7 Car Wash System per liter of water. Properties Color Flash Point, COC, C min Density, kg/L at 72C at 1OOC Viscosity, mPa Drop Point, C min Solids Content, % min Gravelometer at 300 p film build plus salt spray Salt Spray Resistan
6、ce Sag Resistance at 400 cun film build Detergmt Immersion Detergmt Wash Resistance Poultice, Humidity, and Thermal Cycle Proving Ground Verification TABLE 1 values Black 200 1.22 + .02 1.17 + .02 30 nominal 115 99 Test Methods ASTM D92 ASTM D1875 ASTM D1875 Brookfield, at 125 C, Spindle #21, 5 rpm
7、GM9OlOP TABLE 2 values Test Methods Chip Rating of good or better. at -20C per GM9508P Rating Scales see Figures 1 - 4 Must show rating of good or better. 336 h salt spray per GM4298P No more than 3.0 mm creepback. 500 h scribed per GM4298P. with blowoff per GM9102P No sag or dripping after vertical
8、 2 h at 100 C exposure in ovm No loss of material after 168 h NOTE 1 No loss of material NOTE 2 No blistering, peeling, lifting, or NOTE 3 corrosion after 20 cycles. No corrosion on any surface where material applied after 5 cycles of R15-26 Spray the test vehicle w/ material as specified by enginee
9、ring. SEPTEMBER 1990 PAGE 1 9985529 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:34:49 MDTNo reproduction or networking permitted without license from IHS -,-,- - 9006379 0004947 829 I GE
10、NERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint COMPOUND, CORROSION PREVENTIVE, HOT MELT, SPRAYABLE 9985529 NOTE 2: After immersion rinse panel in a SO C detergent solution. Rinse with a spray nozzle (Spray Systems Co., Full Jet #l/2 GG-25, or quivalent) at 50 C water temperatur
11、e, 100 kPa, and 250 mm between the spray no&e and the panel per the following cycle: Immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S minutes Rinse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute Im
12、mersion . . . . . . . . . . . . , . . , . . . . . . . . . . . . . . . . . . . . . . . 10 minutes Rinse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 minutes Immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13、 10 minutes Rinse. . . . . . . _. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 minutes NOTE 3: The poultice test panels 100x300 mm are semi- immersed with 50 mm of poultice consisting of the following mixture: Material Sand Fire Clay Sodium Chloride Calcium Chloride Fe
14、rric Chloride % Mass 70.0 24.0 I.2 2 The test cycle consists of the following: 16 h humidity, (100% RH at 38 C) per GM446SP 2 h at -29 C 2 h at room temperature (22 C) 4 h at 70C 3.3 Process Requirements. Panels are preheated to 45 C prior to application of the material. The material is applied to t
15、he panels by airless spray at a temperature of 150 to 160 C to a film thickness of 150 m, unless otherwise specified. Age panels 72 h prior to testing. 3.4 Stability Rquiremmts. After 1 month of exposure to temperatures of 155 + 5 C, there will be no significant change in viscosity or performance. 4
16、 SOURCE SHIPMENT RESPONSIBILlTV. It will be the responsibility of the supplier to insure that the material is not exposed to temperatures during shipmmt which would cause the material to fail to meet any of the requirements of this specifation. 5 INKIAL SOURCE APPROVAL No shipment shall be made by a
17、ny supplier until representative initial production samples have betn approved by engineering as meeting the requirements of this specification. 5.1 Completed copies of the GM Material Safety Data Sheet and Critical Material Register (available from the engineering department or laboratory), or quiv
18、alent, must be submitted with any new submissions or where a composition change has OCCUCd. 6 INSPECTION AND REJECTION. All shipments of material or parts under contract or purchase order manufac- tured to this specification shall be quivalmt in every respect to the initial samples approved by mginc
19、ering. There shah be no changes in either formulation or manufacturing processes permitted without prior notification and approval by mgi- neering. Lack of notification by the supplier constitutes grounds for rejection of any shipment. While samples may be taken from incoming shipments and checked f
20、or conformance to this specification, the supplier shall accept the responsibili- ty for incoming shipmmts meeting this specification without dependence upon purchaser s inspection. 7 APPROVED SOURCES. Engineering qualification of an approved source is required for this specification. Only sources l
21、isted in the GM Corporate Materials File under this specification number have been qualified by engineering as meeting the requirements of this specification. 8 GENERAL INFORMATION. This specification was originated in November 1983 by Truck & Bus. The latest revisions include: Rev Date Description
22、DiV A 4/89 Editorial CPE B 5/90 Complete Revision PC 9985529 PAGE 2 SEPTEMBER 1990 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:34:49 MDTNo reproduction or networking permitted without li
23、cense from IHS -,-,- m 9006379 0004948 765 I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I COMPOUND, CORROSION PREVENTIVE, HOT MELT, SPRAYABLE 9985529 4 l $ l - , , . FIGURE 1: POOR FIGURE 2: FAIR SEPTEMBER 1990 PAGE 3 9985529 Copyright General Motors North America Provide
24、d by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:34:49 MDTNo reproduction or networking permitted without license from IHS -,-,- - 9006379 0004949 bT1 I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I COMPOUND, C
25、ORROSION PREVEb 99855 l - 0 l * l . 2 . , 9 * TIVE, HOT MELT, SPRAYABLE !9 FIGURE 3 - GOOD FIGURE 4 - EXCELLENT 9985529 PAGE 4 SEPTEMBER 1990 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:34:49 MDTNo reproduction or networking permitted without license from IHS -,-,-