Process of chemical milling and acid aqueous bath used therefor

Claim 1

AN ACID AQUEOUS SOLUTION FOR CHEMICAL MILLING, PRINCIPALLY BY AN OXIDATION-REDUCTION PROCESS, SAID SOLUTION INCLUDING THE FOLLOWING INGREDIENTS (PERCENTAGES BY WEIGHT): HYDROGEN ION AND NITRATE ION IN CONCENTRATIONS CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 10% TO ABOUT 50% OF NITRIC ACID (70%), STANNIC ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 2% TO ABOUT 10% OF STANNIC CHLORIDE, FERRIC ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 2.5% TO ABOUT 20% OF FERRIC CHLORIDE (42*BE.), CHLORIDE ION IN A CONCENTRATING CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING SAID AMOUNTS OF STANNIC CHLORIDE AND FERRIC CHLORIDE, FLUORIDE ION IN A CONCENTRATTION CORRESPOUNDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 2.5% TO ABOUT 15% OF SODIUM BIFLUORIDE, OXALATE ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 0,1% TO ABOUT 5% OF OXALIC ACID AND ACETATE ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM 0% TO 5% OF ACETIC ACID.

Claim 3

A METHOD OF CHEMICAL MILLING AN ARTICLE, PRINCIPALLY BY AN OXIDATION-REDUCTION PROCESS, SAID METHOD INCLUDING THE STEP OF TREATING SAID ARTICLE IN AN AQUEOUS CHEMICAL MILLING SOLUTION HAVING A TEMPERATURE OF FROM ABOUT 60* F. TO ABOUT 170* F., SAID CHEMICAL MILLING SOLUTION INCLUDING THE FOLLOWING INGREDIENTS (PERCENTAGES BY WEIGHT): HYDROGEN ION AND NITRATE ION IN CONCENTRATIONS CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAININGG FROM ABOUT 10% TO ABOUT 50% OF NITRIC ACID (70%), STANNIC ION IN A CONCENTRATION CORRESPOUNDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 2% TO ABOUT 10% OF STANNIC CHLLRIDE , FERRIC ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 2.5% TO ABOUT 20% OF FERRIC CHLORIDE (42* BE.), CHLORIDE ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING SAID AMOUNTS OF STANNIC CHLORIDE AND FERRIC CHLORIDE, FLUORIDE ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 2.5% TO ABOUT 15% OF SODIUM BIFLUORIDE OXALATE ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 0.1% TO ABOUT 5% OF OXALIC ACID AND ACETATE ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM 0% TO ABOUT 5% OF ACETATE ACID.

Claim 4

A METHOD OF CHEMICAL MILLING AN ARTICLE, PRINCIPALLY BY AN OXIDATION-REDUCTION PROCESS, SAID METHOD INCLUDING THE STEP OF TREATING SAID ARTICLE IN AN AQUEOUS CHEMICAL MILLING SOLUTION HAVING A TEMPERATURE OF FROM ABOUT 60* F. TO ABOUT 170* F., SAID CHEMICAL MILLING SOLUTION INCLUDING THE FOLLOWING INGREDIENTS (PERCENTAGES BY WEIGHT): HYDROGEN ION AND NITRATE ION IN CONCENTRATIONS CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAININGG FROM ABOUT 10% TO ABOUT 50% OF NITRIC ACID (70%), STANNIC ION IN A CONCENTRATION CORRESPOUNDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 2% TO ABOUT 10% OF STANNIC CHLLRIDE , FERRIC ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 2.5% TO ABOUT 20% OF FERRIC CHLORIDE (42* BE.), CHLORIDE ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING SAID AMOUNTS OF STANNIC CHLORIDE AND FERRIC CHLORIDE, FLUORIDE ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 2.5% TO ABOUT 15% OF SODIUM BIFLUORIDE OXALATE ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM ABOUT 0.1% TO ABOUT 5% OF OXALIC ACID AND ACETATE ION IN A CONCENTRATION CORRESPONDING TO THAT OBTAINED IN A SOLUTION CONTAINING FROM 0% TO ABOUT 5% OF ACETATE ACID.