1、 ENGINEERING STANDARDS Test Procedure SUPERCEDED EDS-T-7766 Determination of Scab Corrosion Resistance of Organic Coatings on Metal Substrates This standard may be applied only for current projects. It is Superceded for all future projects and replaced by GMW15288. 8TdD9 9PE8 !.42e 4G - (Scab Test)
2、Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program .Bd# GMW15288 ) $4=F7 957F$ . Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: GM Korea Engineering Standards Page 1 of 4 Version : 4 1 Scope Note: Nothing in this standard supersedes applicable laws and r
3、egulations. Note: In the event of conflict between the Korean and English language, the Korean language shall take precedence. 1.1 Purpose. This standard applies to measuring the corrosion resistance of organic coating on the metal base under specified environmental change. 1.2 Applicability. This t
4、est method applies to measuring the corrosion resistance as the degree of separation of coating surface from metal base. 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
5、2.3 Additional References. None 3 Resources 3.1 Equipment. 3.1.1 Humidity Chamber or Climate Chamber. 3.1.2 Hot/Cold Chamber. 3.1.3 5 % Salt Water. 3.1.4 A Knife or Tools to draw a straight line to the base metal. 3.2 Test Piece. 3.2.1 Tests shall be made with completed products as long as possible.
6、 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 07 38%P E:48x 957F$ . 2.1 17 E:4 / . None 2.2 GM E:4 / . None 2.3 dA E:4 / . None 3 4G 88 3.1 4G 8/x . 3.1.1 !3 =- . 3.1.2 ! /7 =- . 3.1.3 5 % 703L . 3.1.4 ? D# :2T8p) 2: (Base Material):
7、2T8x ,8x 3L 8# $ . 3.2 4G D . 3.2.1 7x9PE 1B) 4G 8 4#F 7 7x9PE8p) 4G F$ . GM KOREA ENGINEERING STANDARDS EDS-T-7766 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 2 of 4 Version : 4 3.2.2 When completed products cannot be used, samples of maximum available size shall be
8、taken from any portions of parts. 3.2.3 The cut or end surfaces of samples shall be protected with anti-corrosive painting, etc. 3.2.4 Minimum 3 test pieces are required for initial acceptance test or quality evaluation test, and one is needed for periodical quality control test. 4 Procedures 4.1 Co
9、nditions. 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, reports, etc. 4.2 Instructions. 4.2.1 Draw a straight line with a knife, etc. on the sample surface to a dept
10、h to expose the metal surface. 4.2.2 More than two lines may be drawn. Here, distance between lines shall be kept 30 mm minimum. 4.2.3 Conduct tests with prepared test pieces as follows. 4.2.4 Condition A 2 cycles. 3.2.2 7x9PE8p) 4G F 3L 6# 7 .E8 6# 72P! $48 +6 , A d) 4D8x =x?F7 17F$ . 3.2.3 4D8 !$
11、D# 92F 3P8 4G D8 4G %L66 F+ , 9Id958 E:4* 4G 8x 88F 2F 1 P8 4G D8 4G %L66 F$ . 4 4G 9) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 4 OCT 2011 Apply new Engineering Standard Template. Superceded (Polymer / Organic Material Lab Team) / 4 d3TE:4 64 957 . F9I957 =* (G)8*4G D4 )
