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本文着重介绍了柱塞镀铬修复的情况。指出常用的标准镀铬电流效率低、电镀工艺规范要求严、质量不够理想。作者等采用在标准镀铬电解液中添加适量氟硅酸,进行复合镀铬,使电流效率提高42～53％,加宽了工艺规范,且容易控制,所得镀层硬度、耐磨性和表面光洁度比标准镀铬好。在改进挂具的情况下,生产效率能提高两倍以上。 复合镀铬电解液的组成成分及规范是:CrO_3 250克/公升;H_2SO_4:CrO_3=1:200;H_2SiF_6 8～10克/公升;余水。温度55～62℃;电流密度50～60安培/分米~2。
This article focuses on the plunger chrome repair situation. It is pointed out that the commonly used standard chrome current is low in efficiency, the electroplating process is in strict demand and the quality is not satisfactory. The author uses the standard chrome plating electrolyte to add the appropriate amount of fluorosilicic acid, composite chrome plating, the current efficiency increased by 42 ~ 53%, widened the process specifications, and easy to control, the resulting coating hardness, wear resistance and surface finish than the standard Chrome is good. In the case of improved hanger, production efficiency can be more than doubled. The composition and specification of the composite chrome plating electrolyte are as follows: CrO 3 250 g / L; H 2 SO 4: CrO 3 = 1: 200; H 2 SiF 6 8-10 g / L; Temperature 55 ~ 62 ℃; current density 50 ~ 60 ampere / dm ~ 2.