The chemical polishing of aluminum and aluminum alloys is a 70% (mass percent) phosphoric acid based solution. Commonly used is a mixture of phosphoric acid, nitric acid and sulfuric acid. When the composition of the alloy changes, the sulfuric acid content (mass percentage) is 9%. The change between l5% and the nitric acid content (% by mass) vary between 3% and 9%. Since the working temperature is around 105 °C, a large amount of nitrogen oxides are generated to pollute the environment. Therefore, using a S-type copper brightener as an additive on the basis of a mixture of phosphoric acid and sulfuric acid, a yellow-free chemical polishing process is produced. However, this yellow-free chemical polishing is only suitable for pure aluminum or aluminum-magnesium alloys, and it is inferior to other aluminum alloys. Later, there was a formula with only 2% nitric acid, and similar additives were used, which did not expand the scope of application. However, to date, the phosphoric acid, nitric acid, and sulfuric acid mixed solutions are still in the mainstream formulation because of their strong adaptability. For aluminum alloys with high copper and zinc, it is helpful to add 2~5g/L chromic anhydride during chemical polishing. The manual contains a high-silicon aluminum alloy. For chemical polishing, a mixture of 60-65 mL/L nitric acid, 15-20 mL/L hydrofluoric acid, and glycerol 1-2 mL/L is immersed for 2 s at room temperature. However, this method is more like etching. There is also a formulation containing acetic acid for pure aluminum and 2A12 (LYl2): Concerned about surprises Tagged with: chemical polishing, aluminum alloy, nitric acid, mixed solution, phosphoric acid Previous: How to judge the pinhole generated by the nickel plating layer Next: How to process the neutral nickel plating process Cut-Off Wheels is a simplified product of thousands of impeller, mainly used in industrial production of polishing, is also a kind of industrial consumables products. The impeller matrix has mesh cloth, nylon, plastic, steel paper, etc., the number of pages varies, and is evenly distributed in fan shape. Particle size 36#-400#, 60#, 80# is the most common, the outer diameter of 4"-7" installed in the angular grinder, used for welding seam, positive edge burr grinding and grinding processing, can be interchangeable with the cymbal grinding wheel, has the advantages of good elasticity, high efficiency, good heat loss, low noise can replace the resin cymbal grinding wheel, it has strong elasticity, high tensile and bending strength, Good self-sharpening, high grinding rate, low noise, suitable for grinding the welding seam in the box and the flash edge of the stamping parts. It is mainly used for grinding and polishing of various stainless steel and carbon steel structural parts. Cut-Off Wheels,Grinding Wheel,Disc For Angle Grinde,Flap Wheel Behappy Crafts (suzhou)Co.,Ltd , https://www.haoyuebehappy.com