How is Haomei's oil-free aluminium sheet produced?

How is Haomei's oil-free aluminium sheet produced?

In terms of oil removal treatment before oxidation of aluminium products, most factories still follow the weak alkali chemical oil removal or caustic soda oil removal and white washing, but in recent years, more and more factories have adopted the method of adding surfactants for oil removal. The unique physical and chemical properties of surfactants, reduced surface tension, emulsification, solubilisation foaming and their own good chemical stability to alkali, hard water, etc. are used to improve the oil removal and purification effect, and to form a foam layer on the alkaline surface, inhibit the escape of alkali mist, reduce pollution and improve operating conditions.

In order to make the surface of aluminium products bright and smooth, the aluminium products after forming are generally mechanically polished. However, oxidation after mechanical polishing can only result in a smooth oxide film, which is often not glossy enough. For the requirement of high gloss decorative oxide film products, by mechanical polishing after chemical polishing or electrolytic polishing. Pure aluminium or high purity aluminium-magnesium alloy by chemical polishing or electrolytic polishing can be obtained after a high reflection coefficient of the glossy surface, especially electrolytic polishing, can obtain very satisfactory results. Unfortunately, the general three acid chemical polishing solution due to the presence of nitric acid (HNO3), heating operation, the decomposition of nitrogen dioxide (NO2) gas and produce "yellow dragon" public hazard.