GMNA-9984297-1996.pdf
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1、GM GM7=lA429? =lb - 900b379 0009177 865 m I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I CORROSION PREVENTIVE COMPOUND, HIGH TEMPERATURE, HOT MELT, BLACK, DIPPABLE 9984297 1 SCOPE. This specification covers a thermoplastic cor- rosion preventive compound which provides a
2、protective coating on vehicle frames, chassis components and additional resistance to dripping at high heat. The coating shall be applied over heated (170 to 19O C). alkaline cleaned bare steel in a hot dip system (150 to 17o C) to form adherent low gloss films 75 to 125 pm thick The coating shall b
3、e lOO%solids with no sol- vents. It shall contain no asphalt of fibrous fillers such as asbestos. It shall be nontoxic and noninjurious to plant person- nel. The coating will be drip resistant to 124 C (255F) as applied to production frames: 2 REFERENCED STANDARDS. GMlOOOM GM9102P GM4389M GM912SP GM
4、603SM GM9508P GM7111M GM9531P GM4298P GM9668P GM446SP ASTM D92 GM9010P ASTM D792 3 REQUIREMENTS. ASTM D1321 ASTM D2196 ASTM E28 ASTM G53 EPA M24 SAE J400 3.1 RESTRICTED AND REPORTABLE CHEMICALS (GMlOOOM). All materials supplied to this specification must comply with the requirements listed in GMlOOO
5、M, Restricted and Reportable Chemicals.” 3.2 PHYSICAL PROPERTIES. 3.3 PERFORMANCE REQUIREMENTS. Test panels for all of the performance tests are 2 to 3 mm thick by 75 x 300 mm hot rolled steel, pickled and oiled frame stock. The test panels and material are heated to obtain a coating thickness of 75
6、 to 125 pm. All test panels are to be aged 72 h before tests are performed. See Table 2 for the performance properties required. 3.3.1 Test Methods. The following notes describe the test requirements where formal test methods do not exit. NOTE 1: The test panels shall be aged 72 h at room tempera- t
7、ure after the initial scribe per GM9102P and prior to the salt spray exposure to allow healing of coated film. NOTE 2: The poultice test panels 75 x 300 mm are semi- immersed with 37 mm of poultice mixture consisting of the following: Sand Material % Mass 70.0 Fii Clay 24.0 Sodium Chloride 1.2 Calci
8、um Chloride 4.7 Ferric Chloride 0.1 One cycle of the poultice, humidity, and thermal cycle test consists of the following: 16 h humidity 100% RH and 38 C (GM446SP) 2 h -2O C 2 h room temperature 4 h 70C NOTE 3: Test method for detergent wash resistance: Immerse test panels in detergent solution 50C.
9、 (Detergent solution is composed of 2.5 g DuPont #7 Car Wash Compound, or equivalent, per L of water), rinse under spray nozzle (Spray Systems Co., Full Jet #l/2 GG - 25, or equiva- lent) 5O C water temperature, 70 kPa water pressure, and 250 mm between the spray nozzle and the panel per the fol- lo
10、wing cycle listed below: The material shall also be resistant to warm car wash spray without removal. Testing is similar to GM9531P with a spray temperature of 4X, flow rate of 6 L/minute, pressure of 8000 kPa, spray distance of 300 mm, and spray time of 60 s which consists of 10 passes over 305 mm
11、(12 inch) panel. Immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 minutes Rinse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12、 1 minute Immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 minutes Rinse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 minut
13、es Immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 minutes Rinse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 minutes NOTE
14、 4: The QUV test shall be same as GM9125P cycle 3.2.2 except the UV temperature shall be 50C and the humid- ity temperature shall be 46C. After Salt Spray perform paint blow off procedure and record the results. Within 15 minutes after removal from the environment the material shall with- stand a 2
15、minute rinse, 250 mm from the rinse spray nozzle with 70 kPa water pressure and 38 C water temperature. NOTE 5: Parts coated with the wax shall show no dripping when coated and tested to the temperature cycle of GM9668P at the following temperatures. Testing must be on panels in the vertical positio
16、n or parts in the vehicle position. OCTOBER 1996 - PAGE 1 9984297 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 23:34:02 MDTNo reproduction or networking permitted without license from IHS -,
17、-,- GM GV=l=l842=i7 96 - 9006379 0009L7B 7Tl1 W I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I CORROSION PREVENTIVE COMPOUND, HIGH TEMPERATURE, HOT MELT, BLACK, DIPPABLE 9984297 System Material Test Mtrl and/or Prod Line Processes Production Parts Part Description min Pas
18、s lkmperature Cycle per GM9668P 960 - 1060 pm (38 - 42 mils) panel in 124C (255F) GM9668P 75 - 125 pm(3 -5 mils) panel 135 C (275 F)* 4 mm crevice shown on GM9668P 13O C (26S F) Same Construction Shall also pass 8 h 124 C* (2SS F)* Cradle or Frame Part 124 C (255F) * Supplier to maintain documentati
19、on of each lot of material. NOTE 6: After initial approval, 300 h of QUV by ASTM G53 using conditions in NOTE 4 may be substituted for the 3 months Florida exposure. NOTE 7: Evenly apply 50 g of ground poultice from NOTE 2 by shaking to panels coated to 75 to 125 pm of coating. Heat panels horizonta
20、lly in an oven 7O C for 24 h. Remove and cool. Poultice should show no signs of coating and should be removed with washing without coating damage. NOTE 8: Coat panel similar to that shown in GM9668P 75 to 125 um at the recommended temperature. Allow wax to congeal and remove drip at the edge. Allow
21、panel to cool to room temperature. Coat panel to 975 to 1050 pm by dipping inverted room temperature panel in recommended wax appli- cation temperature for not more than 5 s. Remove panel and let wax congeal 10 minutes at room temperature. Include. panels coated to recommended process 74 to 125 pm,
22、and room temperature panels dipped in molten wax to coating thickness of 950 to 1050 pm. 3.3.2 Subject panels prepared as above to any of the follow- ing temperatures for a period of 2 h; O C, -2o C. -3O C. Panel shall be examined after 2 h exposure for cracking. The above test intent is to eliminat
23、e the cracking that may occur if a freshly dipped frame is exposed to the outside temperatures, 3.4 STABILITY REQUIREMENT, After 3 months of con- stant, slow agitation at the application temperature of 16o C, there shall be no significant change in the viscosity or perfor- mance. After 3 weeks of st
24、orage at application temperature, there should be none to minimal indications of settling or strat- ification and no change in performance. 3.4.1 General Requirement, Additionally, materials noted in SARA-Title 313, shall not be present in the compound above the allowable limits. 4 SOURCE SHIPMENT R
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