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Comprehensive understanding of the characteristics of low pollution hard chromium plating process
(1) The hard chrome workshop of a factory has three large, medium and small chrome plating tanks with a total of more than 10000 liters of solution. Rare earth additives are used to chrome the shaft parts of forestry, machinery and excavators. The polishing is mirror, and the coating is about 80m. Other parts are about 250m (the coating needs to be refined). The rare earth low chromium plating solution is converted from the original specification (250G / lcro,) chromium plating solution, and the plating solution P (CRO) will decrease by 50%, making progress ƍ More than 30%. For example, for the same pin shaft with D of 80-0.18mm and Z of 1300mm, the original plating solution takes 2.5h, and the rare earth low chromium plating solution only takes 1.5h. More than 1t of chromic anhydride is saved in the original plating solution conversion and distribution tank. The chromic acid solution saved according to the unit price at that time can also produce 1 million yuan of chromium plating without using new chromic anhydride materials.
(2)带出量较少实习标明，镀液质量浓度越高，溶液黏度就越大，带出量也就越多。以铝气缸镀铬为例，原镀液P(CrO，)为250g/L，水洗收回槽中的CrO含量很高。以其时的3个水洗槽为例，剖析其槽中P(CrO)结果是：第1水洗槽为15.8g/L;第2水洗槽为4.7g/L;第3水洗槽为1.4g/L摆布。自改用稀土低铬镀液进行出产以后，因为CrO质量浓度的下降，带出量较少。如第1水洗槽中P(CrO)从本来的15.8g/L下降到7L摆布。
This article is from:http://www.newstar-china.com/
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