Aluminium and its alloy phosphoric acid-chromic acid chemical oxidation process are shown in the table.
Phosphoric acid-chromic acid chemical chlorination process specification solution formulation and specification of process conditions
Phosphoric acid (H3P04)/(mL/L)
Chromium anhydride (CrO3)/(g/L)
Ammonium hydrogen fluoride (NH4HF2)/(g/L)
Diammonium hydrogen phosphate [(NH4)2HPO4]/(g/L)
Boric acid (H3B03)/(g/L)
Solution temperature/°C
Processing time/min
50～60
20 to 25
3 to 3.5
2 to 2.5
1 to 1.2
30 to 36
3 to 6
Phosphoric acid-chromic acid chemical chlorination process specification solution formulation and specification of process conditions
Phosphoric acid (H3P04)/(mL/L)
Chromium anhydride (CrO3)/(g/L)
Ammonium hydrogen fluoride (NH4HF2)/(g/L)
Diammonium hydrogen phosphate [(NH4)2HPO4]/(g/L)
Boric acid (H3B03)/(g/L)
Solution temperature/°C
Processing time/min
50～60
20 to 25
3 to 3.5
2 to 2.5
1 to 1.2
30 to 36
3 to 6