GMNA-9984291-1995.pdf
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1、 GM GM998429L 95 111 9006379 0007453 417 I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - P a i n l WATERBORNE, HEAT RESISTANT, BLACK PAINT FOR FRAMES AND CHASSIS COMPONENTS 9984291 1 SCOPE. This specification describes a waterborne, air dry, corrosion preventive paint which provid
2、es a protective coating on frames and chassis components that may be exposed to high heat from engines and exhaust systems. The coating shall be applied over zinc phosphate prepared steel from an approved supplier. The paint should be a dip system. 2 REFERENCED STANDARDS. GM7M GM9 102P ASTM D92 GM 1
3、000M GM9 125P ASTM D792 GM4298P GM9508P ASTM G53 GM4389M GM9509P EPA M24 GM9010P GM9531P SAE 5400 GM907 1 P GM954P 3 REQUIREMENTS. Specific material requirements and appropriate test methods are listed under properties. 3.1 RESTRICTED AND REPORTABLE CHEMICALS (GM1000M). All materials supplied to thi
4、s specification must comply with the requirements listed in GM1000M, “Restricted and Reportable Chemicals“. 3.2 PHYSICAL PROPERTIES. See Table 1. 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 oil frame stoc
5、k. All test panels are to be aged 72 h before tests are performed. See Table 2 for the performance properties required. 3.4 CORROSION REQUIREMENTS. See Table 2A and 2B. 3.5 PROCESS REQUIREMENTS. The coating on frames and cradles processed through a production dip tank system will meet the coating th
6、ickness requirements and corrosion resistance properties shown in Table 2A and 2B. 3.5.1 Surface Preparation. Zinc phosphate is the metal preparation to be used in conjunction with the coating to meet this specification. 3.5.2 Cure Conditions and Temperature. A heated (82 to 93C) forced air dry time
7、 of 20 minutes after the dip applica- tion will dry the material to a dry coating. 3.6 STABILITY REQUIREMENTS. After 6 months of con- stant, slow agitation at the application temperature of 25 to 30C there shall be no significant change in the viscosity per- formance. After 3 weeks of storage, there
8、 should be none to minimal indications of settling or stratification and no change in performance. 3.7 GENERAL REQUIREMENT. Additionally, materials noted in SARA Title 313 shall not be present in the paint above the allowable limits. 3.8 TEST METHODS. The foilowing notes describe the test requiremen
9、ts where formal test methods do not exist. 3.8.1 The test panels shall be aged 72 h at room temperature after the initial scribe per GM9102P and prior to the salt spray exposure. 3.8.2 Test method for detergent wash resistance: a. b. 1. 2. 3. Immerse test panels in detergent solution I 50C. Detergen
10、t solution shall be composed of 2.5 g DuPont #7 Car Wash Compound, or equivalent, per L of water. Rinse under spray nozzle 50C water temperature, 70 kPa water pressure, and 250 mm between the spray nozzle and the panel per the following cycle listed below: a. Immersion . 5 minutes b. Rinse 1 minute
11、a. Immersion . 10 minutes b. Rinse 2 minutes a. immersion . 10 minutes b. Rinse . 2 minutes (Spray Systems Co., Full Jet #1/2 GG-25, or equivalent). 3.8.3 The material shall also be resistant to warm car wash spray without removal. Testing is similar to GM9531P with a spray temperature of 45C flow o
12、f 6 L/min, pressure of 8000 kPa, spray distance of 300 mm, and spray time of 60 s which consists of 10 passes over 300 mm panel. 3.8.4 The QUV test shall be the same as GM9125P except the UV temperature shall be 50C and the humidity tempera- ture shall be 46C. After Salt Spray perform paint blow off
13、 procedure and record the results., Within 15 minutes after removal from the environment the material shall withstand a 7 minute rinse, 250 mm from the rinse spray nozzle with 70 kPa water pressure and 38C water temperature. 3.8.5 After initial approval, 300 h of QUV by ASTM G53 using conditions in
14、3.2.3 may be substituted for the 3 months of Florida exposure. 4 SOURCE SHIPMENT RESPONSIBILITY. It will be the responsibility of the supplier to insure that the material is not exposed to temperatures during shipment which would cause the material to fail to meet any of the require- ments of this s
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