QQ-N-290是美国的电镀镍标准 ' Q6 d3 {' i- I; k0 l' i* i6 NCLASS和GRADE 的意义如下：( r$ T* @' q7 ~
Class 1 Corrosion protective plating( R: [ E+ Q6 c- q( n
Class 2 Engineering plating & k u- Z3 I# h$ w- G% k5 ?3 C7 t G, ?) f
Grades- Class 1 plating shall be of the following grades 8 f5 V0 Y6 C. t: g3 XGrade A 0.0016 inch thick 4 v" ]& U8 H# N3 N+ DGrade B 0.0012 inch thick v1 Q% W1 y9 y* `7 ?: F( R w' C/ g. J( ]Grade C 0.0010 inch thick* n* D9 E. j5 Y; ]) q5 @; o0 b1 J
Grade D 0.0008 inch thick8 w# F4 Y1 a; [: \) i+ C/ D5 m
Grade E 0.0006 inch thick, W( v5 S: Q& [8 _7 D p
Grade F 0.0004 inch thick 8 a; i% u C4 T1 Z$ ]Grade G 0.0002 inch thick
发表于 2008-11-28 08:30:51