1、 ENGINEERING STANDARDS Test Procedure LIMITED USE EDS-T-7188 Test Method for Corrosion Resistance of Materials for Automotive Muffler Do Not Use on New Program; No Replacement. 8% = +lF) 7 8*8 !42e 4G - Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program 72P# 957%L: 6#$ . Copyright 2012 General Motors
2、Company All Rights Reserved February 2012 Originating Department: GM Korea Engineering Standards Page 1 of 4 Version : 3 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 shal
3、l take precedence. 1.1 Purpose. This standard specifies test procedure for evaluating corrosion resistance of materials for motor vehicle mufflers. 1.2 Applicability. This standard applies to materials used for interior and exterior of motor vehicle mufflers. 2 References Note: Only the latest appro
4、ved 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. 3.1.1 Oven. Oven can be heated to 130 E and heating time is controlled. 3.1.2 Combined Corrosion Teste
5、r. Test device that can control heating, cooling, humidity and drying for testing corrosion. 4 Procedure 4.1 Conditions. 4.1.1 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates
6、, reports, etc. 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 . ., 8t 8% = +lF) 7 8*8 !42e8x D4Fd 88F 4G -7 $4F7 9IF 8$ . 1.2 957 -88 . 8% =8 +lF) !. -C 7.7 17%L# 8*7 957%P$ . 2 4) E:4 / :0 : C-H +d%P 9I8 6# F 48 07 38%P E:48x 957F$ . 2.1 17 E:4
7、/ . None 2.2 GM E:4 / . None 2.3 dA E:4 / . None 3 4G 88 3.1 4G 8/x . 3.1.1 47( 7X/D . 130 E 81: 47(F 3L 88p+ , 37 488 9P6%L# 7X/D . 3.1.2 .)F.4 4G d . 37 , !5 , 3$ , 9 &%8 993L4 &68# /x87 ,* 10 M8 -L ?954A G $P* $#$ . Table 1: Artificial Condensate Composition (ppm) / E 1: 8) 8 3L 92e (ppm) pH Cl-
8、SO42- CO32- NO32- NH4- HCOOH 8.5 50 100 500 - 220 - Note 1: pH: Control with NH4OH. Note 2: Ions are added in ammonium salt form. Note 3: Artificial condensate composition may be what has been measured from an actual vehicle. / :0 1: pH: NH4OH) 993L 92e8t 4=72P ?U9IF 8x 17F 3L$ 8$ . 4.2.1.3 Place th
9、e beaker with test sample in the oven, heat for about 30 minutes from room temperature until it reaches 130 E as in Figure 2. Then keep it there for 4 hours. Then cool down to room temperature for about 30 minutes. 4.2.1.4 Examine composition of fluid after each test cycle and make adjustment of com
10、position in case of significant difference from Table 1 (10% or greater). 4.2.1.5 After repeating desired number of cycles of Figure 2 cycle, measure maximum official depth. The number of cycles may be 10150 to be acceptable. 4.2.2 External Corrosion Test Procedure. 4.2.2.1 Heat Test Sample (Size: 5
11、0 mm u 50 mm) in air for about 1 hour at 300 E . 4.2.2.2 Enter test sample to corrosion tester and conduct corrosion test following the sequence in Figure 3. 4.2.2.3 Upon repeating 50, 100 and 500 cycles of corrosion test, measure max official depth each time. 5 Data 4.2.1.3 4G D8 &68# /x8* 7X/D7 “W
12、 , ,* 27t M8 1772P 130 E: 6 30. % 6| 47(F G 448 % 6| 8T:F$ . ,)$ $8 178p) 6 30. % 6|7 !5F$ . 4.2.1.4 5 18A 4G G 768 92e8x 91F7 E 10 =8 (10% 81 )4 ! 7 92e8x 99$4 )4 8* ?U9IF$ . DF 18A 3L# $4P 10 150G 9I$8 -88) F# 8 ,h-F$ . 4.2.2 8% =7 +lF) 8 7.4 4G - . 4.2.2.1 4G D (Size: 4) 50 mm, 2l) 50 mm)8x $4d :
13、E 300 E72P 148 % 6| 47(F$ . 4.2.2.2 4G D8x .4 4G d7 “W ,* 30 M8t ) .44G 8x :FF$ . 4.2.2.3 .44G 8x 50, 100, 500 18A 44F G $4 )4 8* ?U9IF$ . 5 4G $8Bd GM KOREA ENGINEERING STANDARDS EDS-T-7188 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 3 of 4 Version : 3 6 Safety This
14、 standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability
15、of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Condensate: Fluid that is generated by emission gas and moisture and resides within muffler during vehicle operation. 7.2 Acronyms, Abbreviations, and Symbols. Not applicable. 8 Coding System This standard shall be referenced in other doc
16、uments, drawings, etc., as follows: Test to EDS-T-7188 9 Release and Revisions This standard was originated in November 2002. It was first approved by Engineering Standard Committee in November 2002. It was first published in November 2002. 6 6|987 $4F 7 9 ., E:48t 88G ,p: , 86 , 8/x &%8x E FF 3L 8$
17、 . ., 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 . 8 3L : 8% = 7F47 -P2F# -dd43 2e.0 3L.8 FF7 +lF) 7 8*F %L# 76 . 7.2 66 -C dGl . F$-1F 68 . 8 Ed - $* ,l2P! $+ &%72P ., E:48 87%T &
18、# $80 M8 EdF$ . Test to EDS-T-7188 9 9P9I -C P9I 8)Y ., E:48t 2002“x 1187 E:4 -Gl4 .7 %L6 , d3TE:41,h7 8F 2002 “x 11 87 38%L6$ . ., E:48t 2002 “x 11 87 ) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 3 FEB 2012 Apply new Engineering Standard
19、Template. Limited use with no replacement (Corrosion / Metallurgical Material Lab Team) / 4 d3TE:4 64 957 . F9I957 ($4=E:4 68 ) =* (28*4G D4 ) GM KOREA ENGINEERING STANDARDS EDS-T-7188 Copyright 2012 General Motors Company All Rights Reserved February 2012 Page 4 of 4 Version : 3 Figure 1: Internal Corrosion Test Procedure Schematic / ,* 1: !.4 4G - P($ Figure 2: Internal Corrosion Test Temperature Cycle / ,* 2: !. .4 4G 7$ 18A Figure 3: External Corrosion Test Cycle / ,* 3: 7. .4 4G 18A
