1、 ENGINEERING STANDARDS Test Procedure LIMITED USE EDS-T-7738 Test Method for Determining the Impact-Saline Solution Resistance of Organic Coatings Do Not Use on New Program; No Replacement. 8TdD9 9PE8 ! -703L?95 4G - Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program 72P# 957%L: 6#$ . Copyright 2011 G
2、eneral Motors Company All Rights Reserved August 2011 Originating Department: GM Korea Engineering Standards Page 1 of 5 Version : 5 1 Scope Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the event of conflict between the Korean and English language, the Korean l
3、anguage shall take precedence. 1.1 Purpose. This standard specifies the test method for evaluating the impact-saline solution effect on the adhesive properties of organic coatings under specified conditions. 1.2 Applicability. This standard applies to the organic coatings on the parts subject to dam
4、age due to impact. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. EDS-M-1101 2.3 Additional References. None 3 Resources 3.1 Equipment. 3.1.1 Humidity Resistant Chamber. 3.1
5、2 Angular Chilled Cast Iron Shot of size 4 to 5 mm. y Maker: Eisenwerk Wrth GmbH, Jagstfeld, 7107 Bad iendrichshall. 3.1.3 Beaker where test pieces can be immersed. 3.1.4 5 % Sodium Chloride Solution. 3.1.5 Impact Apparatus (see Figure 1). 3.1.6 Adhesive Tape. The one having adhesive properties of
6、about (101) N/25 mm2. 1 P7 :0 : ., E:48 6&F !7$ :4-8! 9I8x $4=F 3L 6$ . :0 : F67t 7568 18 88x 7 , F6* 72T8p) F$ . 1.1 +95 . ., E:48t 8TdD99PE8 E+8x 9I%P 9F72P8 -703L?958 8TdD99P8 9E=)Y7 -,?# 75F8x ?U9IFd 88F 4G -7 $4F7 9IF 8$ . 1.2 957 -88 . ., E:48t 7 8F D28 7)X%L# .E8 8Td D9+7 $4F7 957F$ . 2 4) E:
7、4 / :0 : C-H +d%P 9I8 6# F 48 07 38%P E:48x 957F$ . 2.1 17 E:4 / . None 2.2 GM E:4 / . EDS-M-1101 2.3 dA E:4 / . None 3 4G 88 3.1 4G 8/x . 3.1.1 !3 =- . 3.1.2 4 5 mm A d8 +! !8 :0,p AG . y 9P91 : Eisenwerk Wrth GmbH, Jagstfeld, 7107 Bad iendrichshall. 3.1.3 4D8x ?95F 3L 8# /x8 . 3.1.4 5 % 703L 76 .
8、3.1.5 4G d . 3.1.6 9E= B8F8 . 6 (101) N/25mm28 9E=)Y8x 4: . GM KOREA ENGINEERING STANDARDS EDS-T-7738 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 2 of 5 Version : 5 3.2 Test Piece. 3.2.1 The test piece wherever possible shall be taken from the finished part having dime
9、nsions of (2505) mm (1005) mm (10.2) mm. Should size and shape of the finished part be impracticable, then suitable flat sections of 25 cm2 minimum shall be used instead. 3.2.2 When procedure to 3.2.1 is impracticable, tests shall be conducted on specially prepared organic coated test panels or slab
10、s. 3.2.2.1 Size of Test Pieces. (2505) mm (1005) mm (10.2) mm. 3.2.2.2 Substrate. Metal substrate to EDS-M-1101. 3.2.2.3 Organic coating test piece shall be made in accordance to the dimensions of 3.2.2.1 and 3.2.2.2. 4 Procedures 4.1 Conditioning. Test pieces shall be tested immediately after condi
11、tioning to the conditions below. 4.1.1 The Oven Drying of Organic Coatings. 24 ) 30 hours after coating and baking. 4.1.2 The Air Drying of Organic Coatings. 72 ) 96 hours after coating and baking. 4.1.3 Components Received from the Supplier. Test without conditioning as received. 4.2 Conditions. 4.
12、2.1 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 The test piece shall be clamped into position on the impact apparatus in such a man
13、ner that the test surface shall be exposed to the impacting source by clause 3.1.2. 4.3.2 The main air valve shall be adjusted to give an air pressure of (40.5) bar. 4.3.3 The impact shot of 500g shall be loaded into the receiving funnel so that it shall be whirled into the air stream and impacted o
14、nto the test area. 4.3.4 After test, the test pieces shall be vertically placed, spaced at least 4 cm apart, in the beaker and then 5 % saline solution shall be added to the beaker sufficient in volume to cover 7/8 of the impacted area. 4.3.5 The beaker containing test pieces shall be conditioned in
15、 the humidity chamber of 98 % relative humidity 40 E 2K for (402) hours. 3.2 4G D . 3.2.1 4G D8t (2505) mm (1005) mm (10.2) mm 8 A d) 1$ D9%P 6# 72P! =x?F 3L 88p+ , 9592 25 cm2 +958 4D8x =x?F7 $ %P$ . 3.2.2 888 3.2.18 -8p) 4D =x?4 .4#F 7 C-H :4/x%P 8TdD9 4D D# DD (Slab)8x :4/xF$ . 3.2.2.1 4G D A d .
16、 (2505) mm (1005) mm (10.2) mm. 3.2.2.2 -HB 2: . EDS-M-1100 7 9I%P 4G d7 8Td D9+8 3.1.2 7 8F 8x -O8x 3L 8# -F8p) 8=F$ . 4.3.2 :0 )d 99AG8x AG8T$47 “W6 AG8 8Td D9+7 8x 4F F$ . 4.3.4 4G G 4G D8x 3L:8p) 2F 4 cm 88p) /x87 2l7 % 5 % 703L* +958 6 7/8: 8d$) .#$ . 4.3.5 4G D8 $(h /x8* 98 % R.H 81 , 40 E 2K)
17、 (402) 48 % 6| -?F$ . GM KOREA ENGINEERING STANDARDS EDS-T-7738 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 3 of 5 Version : 5 4.3.6 After the conditioning, the test pieces shall be rinsed under warm water at room temperature and then dried for 10 minutes. 4.3.7 Repeat
18、 the procedure of clauses 4.3.1 to 4.3.2. 4.3.8 A strip of adhesive tape shall be placed onto the coated surface covering the impacted area completely and then pressure shall be applied to the tape to completely remove creases and air bubbles. 5 Data 5.1 Evaluation. The impacted surface shall be eva
19、luated according to the following ratings and peeled diameter shall be evaluated by Figure 1. 4.3.6 4G D8x !6 1772P :*3L) 2l= G 10.8 9F$ . 4.3.7 4.3.1 4.3.38 4G 8x -L.)F$ . 4.3.8 9E=B8F8* 4G D8 .884 +% $8$) 8F .8 % dE 4 6$) -4= 4A$ . 5 4G $8Bd 5.1 D4 . E+7 1B* $88 &%=7 8F D4F+ -I* :8t ,* 10 M8 D4F$
20、 Figure 1 / ,* 1 Note: However, paint peeling by substrate damage is excluded from judgments. 5.1.1 Rating 1. The diameter of a peeled off surface shall be 2 mm max. :0 : $ , 2:8 =AH8! D27 8F Paint -I*# DD9I72P 9P7F$ . 5.1.1 Rating 1 (1 &%= ). -I* %P +8 :8 2 mm 8F8 . GM KOREA ENGINEERING STANDARDS
21、EDS-T-7738 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 4 of 5 Version : 5 5.1.2 Rating 2. The diameter of a peeled off surface shall be 5 mm max. 5.1.2 Rating 2 (2&%= ). -I* %P +8 :8 5 mm 8F8 . 5.1.3 Rating 3. The diameter of a peeled off surface shall be 5 mm min. 5.1
22、3 Rating 3 (3&%= ). -I* %P +8 :8 5 mm ) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 5 AUG 2011 Apply new Engineering Standard Template. Limited use with no replacement (Polymer / Organic Material Lab Team) / 4 d3TE:4 64 957 . F9I957 ($4=E:4 68 ) =* (G)8*4G D4 )
