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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
7 k3 j# v+ h$ @/ x1 w$ g6 Q _CLASS和GRADE 的意义如下：
1 ~4 P3 Y- t( `9 `8 A) FClass 1 Corrosion protective plating
1 S5 y3 D' @, B8 b/ HClass 2 Engineering plating
, ~2 t( }: Y( z# w# ?; ~' z8 R' k5 V2 l% o3 i
Grades- Class 1 plating shall be of the following grades8 T% ?' F2 r' L A3 k" R0 H
Grade A 0.0016 inch thick( U5 j, S3 {; y! E( r$ |
Grade B 0.0012 inch thick
) v6 d4 Y* J1 U n$ v' UGrade C 0.0010 inch thick1 C( Q) O6 u3 @& H C
Grade D 0.0008 inch thick5 f! @' U# b3 C n
Grade E 0.0006 inch thick3 B t5 N1 m& i7 y0 p( ]
Grade F 0.0004 inch thick
% Y1 D- c x( S% P9 i8 i& @Grade G 0.0002 inch thick |
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