1、 ENGINEERING STANDARDS Test Procedure LIMITED USE EDS-T-7735 The Test Method for Resistance to Color Change Do Not Use on New Program; No Replacement. 8TdD9 9PE8 !-12e 4G - Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program 72P# 957%L: 6#$ . Copyright 2011 General Motors Company All Rights Reserved Au
2、gust 2011 Originating Department: GM Korea Engineering Standards Page 1 of 4 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 language shall take precedence. 1.1 Purpose.
3、The purpose of this standard is to determine the resistance of organic coated components to colour change by synthetic fuel oil soot. 1.2 Applicability. This standard is applied to determining the resistance of organic coated surface to colour change under a fuel oil soot environment. 2 References N
4、ote: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM G 23 2.2 GM Standards/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Equipment and Reagent. 3.1.1 Humidity Chamber. 3.1.2 Spoid. 3.1.3 Fan or Compresse
5、d Air. 3.1.4 Mixture of Ethanol and Water (Volume Ratio 1:3). 3.1.5 Synthetic Fuel Oil Soot Solution. 3.1.5.1 4 g Sodium Metavanadate (NaVO3H2O). 3.1.5.2 10 g Ferrous Sulphate (FeSO4 7H2O). 3.1.5.3 8 g Sulphuric Acid (H2SO4S 1.84). 1 P7 :0 : ., E:48 6&F !7$ :4-8! 9I8x $4=F 3L 6$ . :0 : F67t 7568 18
6、88x 7 , F6* 72T8p) F$ . 1.1 +95 . ., E:48t 8TdD99PE E+8 89 7$*8T AG. 767 $4F E+-G : !-12e8x 9IFd 88F 4G -7 $4F 9IF 8$ . 1.2 957 -88 . 7$*8T AG. GF72P 8TdD99PE E+8 1 -G94F2e ?U9I7 957F$ . 2 4) E:4 / :0 : C-H +d%P 9I8 6# F 48 07 38%P E:48x 957F$ . 2.1 17 E:4 / . ASTM G 23 2.2 GM E:4 / . None 2.3 dA E:
7、4 / . None 3 4G 88 3.1 4G 8/x -C 46 . 3.1.1 !3 =- . 3.1.2 3E 8& . 3.1.3 2E 9d D# 6 )d . 3.1.4 7A7 ,p GpF6 (.Fp/x 1 : 3). 3.1.5 89 7$*8T AG. 76 . 3.1.5.1 4 g Sodium Metavanadate (NaVO3H2O). 3.1.5.2 10 g Ferrous Sulphate (FeSO4 7H2O). 3.1.5.3 8 g Sulphuric Acid (H2SO4S 1.84). GM KOREA ENGINEERING STAN
8、DARDS EDS-T-7735 Copyright 2011 General Motors Company All Rights Reserved August 2011 Page 2 of 4 Version : 4 3.1.5.4 The reagents are added to deionized water to give a final volume of 100 ml and a pH value of 1 to 2. 3.2 Test Piece. 3.2.1 The complete components shall be tested as possible as the
9、y can. 3.2.2 If a test on complete components is impractical, test pieces of suitable shape and size shall be taken from parts wherever possible. 3.2.3 When procedure to 3.2.2 is impractical, specially prepared test piece shall be tested. The test piece shall be (2505) mm u (1005) mm u (10.2) mm and
10、 metallic substrate to general steel sheet of GM Korea or equivalent. 3.2.4 Test panels shall be manufactured in accordance with same material and procedure as components are producted and conformed to relevant material specifications. 3.2.5 For initial sample approval and arbitration purposes, at l
11、east 3 test pieces shall be tested and for routine quality control, at least 1 test piece. 4 Procedures 4.1 Conditioning. Test pieces shall be tested according to the following conditions immediately after conditioning. 4.1.1 For Oven Dried Organic Coatings. 24 to 30 hours after coating and baking.
12、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 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be
13、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 containing ethanol/water mixture in clause 3.1.4 and dried using fan or compressed air. 4.3.2 The dried test piece shall be stored
14、 in humidity chamber for 3 hours at +40 E 2K and (932) % relative humidity. 4.3.3 The test piece shall be removed and synthetic fuel oil soot solution spotted onto the test surface using sampling tube in at least 3 places spaced 3 cm min apart in 10 mm diameter. 4.3.4 The test piece shall be stored
15、horizontally in humidity chamber for 48 hours at +40 E 2K and (932) % relative humidity. 3.1.5.4 888 468x Q .Fp 100 ml, pH 1 24 %L$) 87 G3L* =4 GpFF$ . 3.2 4G D . 3.2.1 7x9PE 1B) 4G 8 4#F 7 7x9PE8p) 4G F$ 3.2.2 7x9PE8p) 4G F 3L 6# 7 .E :E 6# 72P! 9592F 3 P8 4D8 4G %L66 F+ , 9Id958 E:4* 4G 8x 88F 2F
16、1 P8 4G D8 4G %L66 F$ . 4 4G 9)d* 17F7 9F$ . 4.3.2 9%P 4D8x +40 E 2K, (932) % 1$43$) 992F 3 cm 81 88p) 3$ 81 6 10 mm8 :8 %L$) 3E 8&) 95FF$ . 4.3.4 4D8x 3LD1B) +40 E 2K, (932) % 1$43$8 !3 =-7 4848 % 6| -?F$ . GM KOREA ENGINEERING STANDARDS EDS-T-7735 Copyright 2011 General Motors Company All Rights R
17、eserved August 2011 Page 3 of 4 Version : 4 4.3.5 After 48 hours, test piece shall be removed and washed with flowing water and dried at normal temperature and evaluated. 5 Data 5.1 Evaluation. After testing at a room temperature, the test pieces shall be evaluated by naked eye according to the foll
18、owing ratings. y Rating 0: No change. y Rating 1: Slight discoloration. y Rating 2: Strong discoloration. y Rating 3: Very strong discoloration. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associ
19、ated 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 Codi
20、ng System This standard shall be referenced in other documents, drawings, etc., as follows: 4.3.5 48 48 G ! H*# ,p) E+8x 2l=F G 1772P 9F7 DD9IF$ . 5 4G $8Bd 5.1 D4 . 1772P 4G G :4 8U6|8p) DD9IF7 $88 &%=8p) D4F$ . y Rating 0: E+ -G 68x . y Rating 1: 4-7 -1 . y Rating 2: 4 F -1 . y Rating 3: $4$H 4 F
21、-1 . 6 6|987 $4F 7 9 ., E:48t 88G ,p: , 86 , 8/x &%8x E FF 3L 8$ . ., E: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 .,
22、 E:48 87%T &# $80 M8 EdF$ . English Resistance to Color Change to EDS-T-7735 - Rating 1 Requirements Test Method Designation ,l Resistance to Color Change to EDS-T-7735 - Rating 1 4G 9P 4G - 4G F+ GM KOREA ENGINEERING STANDARDS EDS-T-7735 Copyright 2011 General Motors Company All Rights Reserved Aug
23、ust 2011 Page 4 of 4 Version : 4 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. 9 9P9I -C P9I 8)Y ., E:48t 1994 “x 6 87 E:4 -Gl4 .7 %L6 , d3TE:41,h7 8F 1994“x 687 38%L6$ . .
24、, 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 )
