工厂试验室用金相方法(个别也有用电磁法)测定镀层,由于镀层很薄或很脆,试件制备有困难,所得数据不准确。我们采用了压痕法,即在显微硬度计或维氏硬度计上用稜锥(锥顶角136°)在试件表面镀层上,打上几个压痕,测出对角线的长度(A),然后用抛磨法去掉镀层,再测出压痕对角线长度(Ao),代入下式就可求出镀层的厚度(H): H=(A-Ao)cos45°.ctg68° A-抛磨前压痕两条对角线和的四分之一。 Ao-抛磨后两条对角线和的四分之一。如果没有硬度计,可在磨床上或用其他方法自制圆锥(锥度60～80°为宜),用圆锥垂直于镀层上打几个压痕,测出抛磨前后压痕半径,代入下式也可求出 The factory laboratory metallurgical method (also useful electromagnetic method) to measure the coating, the coating is very thin or brittle specimen preparation difficulties, the resulting data is not accurate. We use the indentation method, that is, the micro-hardness or Vickers hardness with a pyramid (cone angle of 136 °) on the surface of the specimen coating, marked with several indentation, measured the length of the diagonal A), and then use the polishing method to remove the coating, and then measured the indentation diagonal length (Ao), substituted into the following formula can be obtained coating thickness (H): H = (A-Ao) cos45 ° .ctg68 ° A- A quarter of the sum of two diagonal lines before polishing. A - Polished after the two diagonal and a quarter. If there is no hardness tester, you can make a cone on the grinding machine or by other methods (taper 60 ~ 80 ° is appropriate), use the cone perpendicular to the plating hit a few indentation, measured before and after polishing the indentation radius, into the following formula Can be found