Brass chemical polishing solution and preparation method thereof

Abstract

The invention discloses a brass chemical polishing solution and a preparation method thereof, and one liter of the polishing solution contains 60-140g of persulfate, 200-350ml of 92.5 wt%-98.0 wt% concentrated sulfuric acid, 0-60ml of 85.0wt% strong phosphoric acid, 1-10g of citric acid, 2-10g of 7.H2O ferrous sulfate, 0-3g of sodium chloride, 0-6g of urea, 0.2-1.0g of sodium lauryl sulfate and balance of water. The invention adopts persulfate (kalium, sodium, ammonium and the like) as an oxidant to replace strong nitric acid, hydrogen peroxide and the like adopted for traditional chemical polishing, avoiding using the oxidant harmful to the environment and generating nitrogen oxide gas with strong toxicity for humans in the prior art; the brass chemical polishing solution has the characteristics of environmental protection, more stability (greatly improved by being compared with the stability of a hydrogen peroxide polishing solution), high polishing speed, good polishing effect andthe like. The brass polished through the brass chemical polishing solution has a flat and smooth surface and golden appearance.

Description

technical field [0001] The invention relates to the field of metal surface treatment chemical polishing, in particular to a brass chemical polishing liquid and a preparation method thereof. Background technique [0002] Brass (copper mass content is 65% to 85%) is a widely used metal material in the manufacturing industries of daily hardware, handicrafts, electrical instruments and mechanical parts. Generally, it needs to be polished to achieve a decorative appearance. Compared with mechanical polishing and electrochemical polishing, the biggest advantage of chemical polishing is that it does not require power supply, and can process products with complex shapes and different materials, especially suitable for small parts with complex geometric shapes, and has good polishing uniformity; equipment and Simple operation, low investment and strong adaptability; it can polish many workpieces at the same time, suitable for mass production, mainly used for decorative processing of...

AI Technical Summary

Problems solved by technology

(2) Dichromic acid and its salts, due to the use of hexavalent chromium, cause serious environmental pollution, so this type of polishing method is basically not used, and the cost is high, so the industrial application is less and less

(3) Hydrogen peroxide, although there is no environmental pollution, hydrogen peroxide is unstable, especially metal ions such as dissolved copper in the polishing process have a strong catalytic effect on the decomposition of hydrogen peroxide, even if it is added in the polishing solution In the case of stabilizers, the polishing fluid containing hydrogen peroxide has a short service life, and it will decompose violently to make the polishing fluid invalid, and the cost is high