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
FHM fence factory provides a variety of Garden Fencing Kits to support your selling.You could have a multiple choice here.FENCING ACCESSORIES ALL MADE FROM GALVANIZED COATED STEEL - easy replacement of parts for your Garden Fence needs.Such as
Post cap,post band,middle post end,Y arm and wire tension. According to the surface treatment we have hot dipped galvanized and pvc coated . The color have dark green ,black,red etc.
Garden Fence Accessories,Garden Fence Fittings,Pvc Garden Fence Fittings,Garden Fence Kits
DINGZHOU FEIHONG METAL MESH LIMITED , http://www.fhmfencing.com