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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' t# R) l4 j3 P; [4 Q$ m
CLASS和GRADE 的意义如下：0 R, }1 N( I2 W, J( p
Class 1 Corrosion protective plating
% p/ W N# x: I8 L. rClass 2 Engineering plating
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Grades- Class 1 plating shall be of the following grades
" b- h/ H+ C N0 nGrade A 0.0016 inch thick
2 L% K3 l2 O0 [5 |3 e4 jGrade B 0.0012 inch thick" C8 |/ j& p% S7 y9 S* |* S3 M1 q* V
Grade C 0.0010 inch thick) K7 y5 N' e! `& _ y
Grade D 0.0008 inch thick
: Z1 m& b5 ]0 {* CGrade E 0.0006 inch thick
7 ~, T t* z' j$ J: H; GGrade F 0.0004 inch thick
8 k: o+ c' Q2 w5 Z0 R9 JGrade G 0.0002 inch thick |
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