Haomei electrolytic aluminium manufacturing process

Haomei electrolytic aluminium manufacturing process

Good quality and stable electrolytic polishing solution contains chromic anhydride, which produces chromium-containing waste water, pollutes the environment and causes three waste disposal problems. Naturally, people want to experiment with chemical polishing and electrolytic polishing processes that do not produce "yellow dragons" and do not contain chromium. Ltd. production of "aluminium parts without yellow smoke chemical polishing additives WXP", with the assistance of the environmental protection department through the identification. Additive WXP is used for phosphoric acid, sulphuric acid type polishing solution brightening agent, and also has the role of inhibiting acid mist. The process formula used is: phosphoric acid (specific gravity d = 1.7) industrial pure 800 ml / litre; sulphuric acid (specific gravity d = 1.84) industrial grade 200 ml / litre; WXP for 2 ml / litre; temperature 95 ~ 120 ℃. 3 g of aluminium per litre should be added to the newly prepared solution. As the formula does not contain nitric acid, so polishing does not produce "yellow dragon" public hazard; inhibit acid mist effect is also good.

As for electrolytic polishing without chromic anhydride, many articles have listed a number of formulas, mostly in phosphoric acid, sulfuric acid-based polishing solution with some organic acids (such as citric acid, tartaric acid, oxalic acid) or alcohols (such as ethanol, butanol, glycerin), etc., in order to try to replace chromic anhydride by these additives on the surface of aluminum corrosion-polishing effect. However, after testing, such formulations have high costs and poor electrolyte stability, which makes it difficult to promote the use in large industrial production.