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采用电解抛光的制样方法,用扫描电镜对热处理后钢基体上双层化学镀层(Ni-P/Ni-W-P)的截面进行观察,取得了满意的结果。制样方法:先将试样的纵截面用手工细磨,然后在抛光盘上抛光,抛光完毕后,再在MTP-Ⅰ型电解减薄器上进行电解抛光。电解液为5%高氯酸乙醇溶液;电解抛光电压为40V;抛光时间为10s。制样完毕后即可在扫描电镜下观察。由图1可见,在钢的基体表面呈现了四层结构,自上至下为:第一层为镍的氧化物钝化层,这一层在高温热处理过程中形成;第二层为Ni-W-P合金层;第三层为Ni-P合金层;第四层为镍铁合金层,这一
The samples prepared by electrolytic polishing were observed by scanning electron microscope (SEM). The cross sections of the double layer electroless plating (Ni-P / Ni-W-P) on the steel substrate after heat treatment were observed and satisfactory results were obtained. Sample preparation method: First, the longitudinal section of the sample is finely ground by hand and then polished on a polishing pad. After the polishing is completed, electrolytic polishing is performed on the MTP-I electrolytic thinner. 5% electrolyte solution of ethanol perchloric acid; electrolytic polishing voltage of 40V; polishing time of 10s. Sample preparation can be observed under the scanning electron microscope. It can be seen from Fig. 1 that the surface of the steel substrate exhibits a four-layer structure, from top to bottom: the first layer is an oxide passivation layer of nickel formed during high-temperature heat treatment; the second layer is a Ni- WP alloy layer; the third layer is a Ni-P alloy layer; the fourth layer is a nickel-iron alloy layer, this one