DCHZ-207 acidic sand surface agents this product is a white powder, suitable for aluminum and aluminum acidic sand surface treatment. This product has a wide range of technology, aluminum consumption is minimal (7kg / T), corrosion uniform, soft sand surface, and can fully remove surface marks extrusion characteristics. First, the bath composition DCHZ-207 10g / L ammonium hydrogen 60g / L with tap water with two process parameters temperature 25-45 ℃ time 3-12min F- 30-45g / L PH 3-4 Third, consumption of 40kg of ammonium fluoride / T aluminum 4kg DCHZ-207 / T aluminum