アルミニウムおよびアルミニウム合金の化学研磨は、次のようなソリューションです。 70% (質量パーセント) リン酸. 一般的に使用されるのはリン酸の混合物です, 硝酸, そして硫酸. 合金組成が変化した場合, 硫酸含有量 (質量パーセント) は 9%. 硝酸含有量 (質量パーセント) の間で異なります 3% そして 9%. 使用温度は105℃程度なので, a large amount of nitrogen oxides are produced and pollute the environment.
したがって, on the basis of the mixed solution of phosphoric acid and sulfuric acid, the S acid copper brightener is used as an additive to produce a yellow smoke-free chemical polishing process. しかし, this non-yellow-smoke chemical polishing is only suitable for pure aluminum or aluminum-magnesium alloys, and has poor effect on other aluminum alloys. Later, a formula with only 2% nitric acid appeared, and similar additives were used, but the scope of application was not expanded. しかし, the current blend of phosphoric acid, 硝酸, and sulfuric acid is still the mainstream formulation because of its strong adaptability.
For aluminum alloys with high copper and zinc content, it is helpful to add 2-5g/L chromic anhydride during chemical polishing. There is a description in the manual that aluminum alloys with high silicon content are chemically polished with a mixture of 60～65mL/L nitric acid, 15～20mL/L hydrofluoric acid, and 1～2mL/L glycerin, and soaked at room temperature for 2s. But this method is more like etching.
There is also a formula containing acetic acid, suitable for pure aluminum and 2A12 (LYl2):
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