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采用线条照相镀黑铬的工艺方法,在生产游标卡尺时,首先必须对已镀好白铬层的卡尺表面进行有效的清洁处理。除去表面的油脂、汗液、灰尘及有害的氧化膜,是保证照相感光胶能否很好地粘附在尺身表面的条件,是影响照相镀黑质量的重要因素。不良的清洁处理将导致不良的加工,造成废品成堆。美国W·S·Garwood和R·E·Dunning曾分别指出,有机镀层与铬镀层之间结合的必要条件之一,是要将有机涂料涂在尚未被油脂、灰尘或其它外来物质所污染的新鲜的清洁表面上。
The use of line photography black chrome process, the production of vernier caliper, the first must be plated with white chrome layer caliper surface for effective cleaning. Remove the surface of the grease, sweat, dust and harmful oxide film is to ensure that the photographic adhesive can stick well on the surface of the surface conditions, is an important factor affecting the quality of photographic black. Poor cleaning will result in poor processing, resulting in a pile of scrap. Wes Garwood and RD Dunning have respectively pointed out that one of the necessary conditions for the combination of organic and chrome plating is to apply the organic coating to fresh or not yet contaminated with grease, dust or other foreign matter On the clean surface.