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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
' r; h5 ~8 q# ~8 K! RCLASS和GRADE 的意义如下：
8 n2 F% A& V4 ~Class 1 Corrosion protective plating
+ i( b6 {/ H* I, P! _& V7 W% K. hClass 2 Engineering plating
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Grades- Class 1 plating shall be of the following grades! i- G" r0 F" U5 k$ g
Grade A 0.0016 inch thick" ]& l+ y' h+ a2 N% G% V
Grade B 0.0012 inch thick, F, V- A. l- O( h7 y7 n4 ~( H8 T# K
Grade C 0.0010 inch thick. l1 ]/ G/ J* l
Grade D 0.0008 inch thick
7 m0 A0 {' S& O2 Q4 Q" F. ` JGrade E 0.0006 inch thick. Y9 ~3 s9 q, E' c
Grade F 0.0004 inch thick& a1 v$ U6 K' @0 v0 k( J6 n
Grade G 0.0002 inch thick |
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