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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
- M5 Z$ C/ D8 N9 g/ }CLASS和GRADE 的意义如下：; k0 z3 o- Q/ F- G7 [/ q+ {; I
Class 1 Corrosion protective plating
* E, w& e( V0 i- o1 [ ~1 ?: KClass 2 Engineering plating
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Grades- Class 1 plating shall be of the following grades
* \8 w( K7 r& f! I7 t& |0 iGrade A 0.0016 inch thick/ g: _9 }4 o8 @ S# H9 L4 D
Grade B 0.0012 inch thick7 v0 x: r" l Q5 }2 x0 ?; Q
Grade C 0.0010 inch thick
% ?0 D6 |( c( ], NGrade D 0.0008 inch thick
5 m% G2 f$ a2 e- P# D9 r! M+ _Grade E 0.0006 inch thick
8 G; i& m3 M+ q5 }5 K/ HGrade F 0.0004 inch thick) i# n0 d4 _$ g5 l6 M: T0 x
Grade G 0.0002 inch thick |
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