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发表于 2008-11-29 19:11:27
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来自： 中国北京
QQ-N-290是美国的电镀镍标准
0 G0 J8 u7 l- R+ hCLASS和GRADE 的意义如下：2 a6 g& |6 T+ b2 u8 d
Class 1 Corrosion protective plating& a7 a o: c1 K: Y( q4 {
Class 2 Engineering plating
+ o. H. ^7 n" G+ c; j; z8 B; d1 L
Grades- Class 1 plating shall be of the following grades
7 r+ N7 G, f$ U! L7 I8 h7 v* G; h. lGrade A 0.0016 inch thick7 M* o* b. O, a
Grade B 0.0012 inch thick Z: g) Q ?! f' {8 _1 b
Grade C 0.0010 inch thick
- A3 a/ n# A' iGrade D 0.0008 inch thick
% L* P- z2 t, P( IGrade E 0.0006 inch thick& h' M6 ?1 [1 k- s8 ~
Grade F 0.0004 inch thick
3 u1 N, @: j5 S! NGrade G 0.0002 inch thick |
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