1、 ENGINEERING STANDARDS Test Procedure LIMITED USE EDS-T-7736 Test Method for Resistance of Organic Coatings to Surface Deterioration by Chemical Action Do Not Use on New Program; No Replacement. 8TdD9 9PE8 !E+-G2e 4G - Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program 72P# 957%L: 6#$ . Copyright 2011
2、 General Motors Company All Rights Reserved August 2011 Originating Department: GM Korea Engineering Standards Page 1 of 3 Version : 4 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
3、 language shall take precedence. 1.1 Purpose. The purpose of this standard is to determine the resistance of organic coated surfaces to surface deterioration by synthetic chemical reagents. 1.2 Applicability. This standard is used to determine the surface discoloration, swelling or luster deteriorat
4、ion etc. by chemical reagents. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Equipment and Reagents. 3.1.1 Spoid or Inj
5、ector. 3.1.2 10 Watch Glasses. Internal diameter 25 to 28 mm. 3.1.3 Fan or Compressed Air Supply. 3.1.4 Cotton Flannel. 3.1.5 Test Solution A. 3.1.5.1 0.5 % Sodium Hydroxide (NaOH). 3.1.5.2 0.5 % Sodium Carbonate (NA2CO3). 3.1.5.3 0.5 % Hydrochloric Acidchcl : 36 %. 3.1.5.4 10 % Citric Acid. 1 P7 :0
6、 : ., 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 8TdD9 E+8 89 GF767 8F !E+ -G2e8x ?U9IF# -7 $4F7 9IF 8$ . 1.2 957 -88 . ., E:48t 9I%P GF6E7 8F E+8 -1 , .E8 , EB94F &%8x ?U9IF#$ 957F$ . 2 4) E:4 / :0 : C-H +d%P 9I8 6# F 48 07 38%P E:48x 957F$ . 2
7、.1 17 E:4 / . None 2.2 GM E:4 / . None 2.3 dA E:4 / . None 3 4G 88 3.1 4G 8/x -C 46 . 3.1.1 3E 8& D# :01d . 3.1.2 4 9E4 : ! 25 28 mm, 100.P 3.1.3 FAN D# 6 )d* 17F 9d . 3.1.4 8i . 3.1.5 4G 76 A. 3.1.5.1 0.5 % Sodium Hydroxide (NaOH). 3.1.5.2 0.5 % Sodium Carbonate (NA2CO3). 3.1.5.3 0.5 % Hydrochloric
8、 Acidchcl : 36 %. 3.1.5.4 10 % Citric Acid. GM KOREA ENGINEERING STANDARDS EDS-T-7736 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 2 of 3 Version : 4 3.1.5.5 38 % Sulphuric Acid (H2SO4: 96 %). 3.1.5.6 50.5 % Deionised or distilled water. 3.1.6 Test Solution B. 3.1.6.1 2
9、.8 % Sodium Hydroxide (NaOH). 3.1.6.2 2.0 % Sodium Carbonate (NA2CO3). 3.1.6.3 2.0 % Hydrochloric Acidchcl (HCl: 36 %). 3.1.6.4 9.0 % Deionised or distilled water. 3.1.7 Above presented % shall be the standard of mass. 3.1.8 Mixture of ethanol and distilled water 1 to 3. 3.2 Test Piece. 3.2.1 The te
10、st pieces wherever final shall be taken. Should suitable size or shape be impractical, other final coated part shall be taken as possible. 3.2.2 When procedure to 3.2.1 is impractical, specially prepared organic coated test pieces or slabs shall be used. 3.2.2.1 Size of Test Piece. (2505) mm u (1005
11、) mm u (1 0.2) mm. 3.2.2.2 Substrate. Metallic substrate to EDS-M-11XX. 3.2.3 For initial sample approval and arbitration purposes, at least 3 test pieces, and for routine quality control, at least 1 test piece shall be tested. 4 Procedures 4.1 Conditioning. The test pieces shall be tested immediate
12、ly after conditioning for below periods. 4.1.1 For Oven Dried Organic Coatings. 24 to 30 hours after coating and baking. 4.1.2 For Air Dried Organic Coatings. 72 to 96 hours after coating and drying. 4.1.3 For Components Received from the Supplier. test without conditioning. 4.2 Conditions. 4.2.1 Te
13、st 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 organic coated surface of test piece shall be wiped with the cotton flannel containin
14、g ethanol/water mixture (clause 3.1.5) and dried using fan or compressed air. 4.3.2 The test solution A, B shall be dropped onto the test pieces by one drop with interval of 3 cm and covered with a watch glass. 3.1.5.5 38 % Sulphuric Acid (H2SO4: 96 %). 3.1.5.6 50.5 % Deionised or distilled water. 3
15、.1.6 4G 76 B. 33.1.6.1 2.8 % Sodium Hydroxide (NaOH). 3.1.6.2 2.0 % Sodium Carbonate (NA2CO3). 3.1.6.3 2.0 % Hydrochloric Acidchcl (HCl: 36 %). 3.1.6.4 9.0 % 87G3L D# :*3L . 3.1.7 1d 9P4%P %# :( d:48 . 3.1.8 7A70 :*3L GpF6 (1:3 .Fp/x ). 3.2 4G D . 3.2.1 4G D8t 1$ 6# 72P! =x? 4#F+ 9592F 3 P8 4G D8 Fx
16、7F 9Id958 E:4* 4G 8x 88F2P# 2F 1P8 4G D8 Fx7F$ . 4 4G 9 )d) 94A$ . 4.3.2 3E 8& D# :01d* 17 4G 76 A7t B * 4G D 887 1 -76 2 3 cm 88p) & % 49E4) $#$ . GM KOREA ENGINEERING STANDARDS EDS-T-7736 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 3 of 3 Version : 4 4.3.3 The test p
17、iece shall be stored for (241) hours at normal temperature and rinsed and dried after the watch glass shall be removed. 5 Data 5.1 Evaluation. The test pieces shall be evaluated in comparison with untested same parts or other test pieces by naked eye as follows. y Rating 0: No change. y Rating 1: Sl
18、ight discoloration. y Rating 2: Strong discoloration or swelling. y Rating 3: Very strong discoloration. y Rating 4: Surface disintegration. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated
19、 with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable. 8 Coding S
20、ystem This standard shall be referenced in other documents, drawings, etc., as follows: Test to EDS-T-7736 9 Release and Revisions This standard was originated in June 1994. It was first approved by Engineering Standard Committee in June 1994. It was first published in June 1994. 4.3.3 (241) 48 % 6|
21、 17 -? G 49E4* 94 3)1 9PF G 3L2l -C 9F$ . 5 4G $8Bd 5.1 D4 . 4G D8t 4G F: 68t % 8F .E D# $* 4D0 8U6|8p) /xF G 6x(7t M8 D4F$ . y 0 &%= : -G 68 . y 1 &%= : -,2lF -1 . y 2 &%= : 4 F -1 D# .E8 . y 3 &%= : $4$H 4 F -1 . y 4 &%= : E+ .F . 6 6|987 $4F 7 9 ., E:48t 88G ,p: , 86 , 8/x &%8x E FF 3L 8$ . ., E:
22、48t 87 $4F 170 4)%P +& 6|98 ,l9P8 F8x 9P4F:# 6#$ . &d(2P 17 987 95FF 6|980 I 1B* 9DF , -18 9PF 728 957 7 .* 9IF# 8t ., E:4 1788 =y8 1F8$ . 7 768 9I8 7.1 98,l 76 . F$-1F 68 . 7.2 66 -C dGl . F$-1F 68 . 8 Ed - $* ,l2P! $+ &%72P ., E:48 87%T &# $80 M8 EdF$ . Test to EDS-T-7736 9 9P9I -C P9I 8)Y ., E:48
23、t 1994 “x 6 87 E:4 -Gl4 .7 %L6 , d3TE:41,h7 8F 1994“x 687 38%L6$ . ., E:48t 1994“x 687 ) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 4 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 )
