GMKOREA EDS-M-8732-2003 1C1B TOP COAT (VERSION 6).pdf
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1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology. Standards 1C1B TOP COAT EDS-M-8732 ISSUED DATE: 1989. 05. 28 REVISED DATE: 2003. 05. 20 VERSION: 6 EDS-M-87321C1B TOP COAT PAGE: 1/9 ISSUED DATE: 1989. 05. 28 REVISED DATE: 2003. 05. 20 VERSION: 6 GM DAEWOO Auto & Technology 1
2、. SCOPE This standard aims at establishing the physical properties of the 1C1B top coat that is applied in the paint shop to improve the appearance and enhance the chemical resistance and physical properties of the automobile painted surface. 2. GENERAL DESCRIPTION 1C1B top coat consists of alkyd an
3、d melamine resin as the base and color pigment. 1C1B permit manual application with a general air spray gun and automatic application by the electrostatic BELL machine. 3. TEST CONDITIONS 3.1. Standard conditions of test place 3.1.1. The test shall basically be conducted at temperature of 202 and re
4、lative humidity of 65%5%. 3.1.2. When the above conditions cannot be met, temperature and relative humidity shall be entered on the test report. 3.2. Material condition of test piece 3.2.1. The test piece shall basically be the finished vehicle built to the determined coating spec, but the one built
5、 of the same material to the same spec may be used. 3.3. Baking condition 3.3.1. Test piece baking conditions shall basically be (1355)20 minutes (effective time). 3.3.2. The baking time and temperature shall be based on the point when the temperature of the material to coat on reaches a designated
6、point after the test piece is put into a dry oven. 4. REQUIREMENTS 4.1. Properties of delivered material 4.1.1. Color : according to color specifications by models. 4.1.2. Delivery viscosity (EDS-T-7908) (1) FORD CUP #4, 20 (2) Specified value5 Sec. 4.1.3. Non-volatile (EDS-T-7937) (1) 1202 hours (2
7、) Specified value 1.5. EDS-M-87321C1B TOP COAT PAGE: 2/9 ISSUED DATE: 1989. 05. 28 REVISED DATE: 2003. 05. 20 VERSION: 6 GM DAEWOO Auto & Technology 4.1.4. Dilution thinner EDS-M-8710 : Thinner for primer surfacer and mono coat(top coat) 4.1.5. Electric resistance (EDS-T-7913, based on diluted paint
8、) 5001,500 . 4.1.6. Specific gravity (EDS-T-7965) (1) 100 cc Specific gravity cup, 20 (2) Specified value 0.02. 4.2. Material condition at coating 4.2.1. Dilution viscosity (EDS-T-7908, FORD CUP NO. 4, at 20) Add EDS-M-8710 solid thinner to the undiluted paint to adjust to the specified viscosity at
9、 20. 4.2.2. Storage stability under undiluted solution (EDS-T-7963) (1) Check the paint condition after exposure to 50120 hours and subsequent exposure from ambient temperature to 202K. (2) After storage, the paint shall be free from gel and seeding and the viscosity increase compared to the initial
10、 state shall less than 20 Sec. (3) No abnormalities in workability and external appearance. 4.2.3. Dilution stability (1) No precipitation after dilution to the specified viscosity, fill it in mass cylinder and subsequent exposure to room temperature for 2 hours. (2) Vessel : Mass cylinder capable o
11、f 500L 4.2.4. Coating method (1) Manual application with a general air spray gun. (2) Automatic application by the electrostatic BELL machine. 4.2.5. Precoated surface (1) Phosphate film + EDS-M-8711 cathodic electro dip primer (2) Phosphate film + EDS-M-8711 + sanded and nonsanded primer surfacer E
12、DS-M-8740, EDS-M-8756, EDS-M-8766. 4.2.6. Flash-off time Expose to 4045 for about 8 minutes. 4.2.7. Drying method: convection drying 4.2.8. Drying time and temperature: Dry at 1355(based on body temperature) for 20 effective minutes 4.2.9. Appearance after drying: After drying, the coated surface sh
13、all show no sign of defects, such as run and cratering. EDS-M-87321C1B TOP COAT PAGE: 3/9 ISSUED DATE: 1989. 05. 28 REVISED DATE: 2003. 05. 20 VERSION: 6 GM DAEWOO Auto & Technology 5. REQUIREMENTS AFTER DRYING 5.1. Dry film thickness (EDS-T-7970) 4050W 5.2. Repairability (unassembly) When repair co
14、ating is applied 3 times with the same paint (135520 minutes: effective time), it shall show no signs of color change or loss of gloss. 5.3. Hiding power (EDS-T-7914) 5.3.1. Hiding power with the black and white sheets shall conform to the base coat color characteristics as long as it does not affec
15、t work in the line. 5.3.2. The practical hiding force shall not be smaller than 70% of the specified film thickness. 5.4. Paint film composition of test piece Condition A : Phosphate film + EDS-M-8711 + EDS-M-8740, EDS-M-8756, EDS-M-8766 + EDS-M-8732 5.5. Requirements after exposure to ambient tempe
16、rature for 24 hours 5.5.1. Distinction Of Image / Gloss (EDS-T-7907, ATI 1864 SQC S/N 620) To be min 80% when measured under test piece condition A from an angle of 20. 5.5.2. Adhesion (EDS-T-7910) (1) Tape : 3M #610 (2) Cutter : Use a cutter to JIS K 5400 or equivalent cutter (NT cutter A type is r
17、ecommended) (3) Tape peel angle : 90g (4) Cutter angle : about 30g (5) Adhesion under test piece condition A shall be GT-0 and there shall be no drop in adhesion after elapse of 4 weeks 5.5.3. Hardness (EDS-T-7948) Hardness under test piece Condition A shall be 80 95. 5.5.4. Cupping (EDS-T-7974) Cup
18、ping under test piece Condition A shall not be smaller than 5mm and there shall be no drop in cupping performance after elapse of 4 weeks. 5.5.5. Bending (EDS-T-7912) (1) Conical corn diameter : 9.540.5X (2) Length: 212X (3) When tested under test piece Condition A, there shall be no sign of surface
19、 defects, such as cracks and peeling-off. EDS-M-87321C1B TOP COAT PAGE: 4/9 ISSUED DATE: 1989. 05. 28 REVISED DATE: 2003. 05. 20 VERSION: 6 GM DAEWOO Auto & Technology 5.5.6. Over baking (EDS-T-7919) After exposure to 13520 minutes (effective time)3 cycles (initial drying excluded) under test piece
20、Condition A, there shall be no abnormalities in the film surface (swelling, peeling, discoloration, etc) and adhesion shall be GT-0. 5.6. Requirements after exposure to ambient temperature for 72 hours 5.6.1. Humidity (EDS-T-7951) (1) Test condition : 403, 98%RH Min. (2) After test under test piece
21、Condition A for 240 hours, there shall be no changes on the surface. (3) After exposure to ambient temperature for 24 hours, adhesion shall be Min. GT-1. 5.6.2. Gasoline resistance (EDS-T-7909) After exposure to ambient temperature for 24 hours immediately following test under test piece Condition A
22、, there shall be no changes on the surface and Min. rating 2 shall be ensured. 5.6.3. Oil resistance (EDS-T-7930) After exposure to 402K, 932%RH for 48 hours under test piece Condition A, rating 0 shall be ensured. 5.6.4. Acid resistance (EDS-T-7920) After light polishing under test piece condition
23、A, there shall be no corrosion when observed visually or with a microscope. 5.6.5. Alkali resistance (EDS-T-7955) After soaking in 0.1N NaOH at the ambient temperature for 7 hours under test piece condition A, there shall be no abnormalities in the appearance.(Rating 0 shall be ensured) 5.6.6. Chipp
24、ing resistance (EDS-T-7945) (1) Gravel : JIS #7, 50g (2) Test temperature : normal and cold (-20) (3) After test under test piece condition A, rating 6 or higher shall be ensured. After test under EDS-M-8740 and EDS-M-8756, rating 6 or higher, and EDS-M-8766, rating 8 or higher shall be ensured. 5.6
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