Metal polishing compositions and electropolishing of metals therewith

Claim 1

A PROCESS OF CHEMICALLY POLISHING A METAL SURFACE SUSCEPTIBLE TO POLISHING IN A PHOSPHORIC ACID BATH WHICH COMPRISES APPLYING A DIRECT CURRENT VOLTAGE WITHIN THE RANGE OF 1 TO 20 BOLTS AT A CURRENT DENSITY WITHIN THE RANGE OF 10 TO 150 AMPERES PER SQUARE FOOT TO SAID METAL SURFACE AS THE ANODE IN A BATH CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF PHOSPHORIC ACID, AS SUBSTANTIALLY THE SOLE ACID, CONTAINING UP TO 50% BY VOLUME OF WATER AND 0.2% TO 2.0% BY WEIGHT OF THE PHOSPHORIC ACID OF AN OXYALKYLENE COMPOUND HAVING A MOLECULAR WEIGHT OF AT LEAST 200, SAID OXYLKYLENE COMPOUND BEING SOLUBLE IN THE BATH IN THE PROPORTIONS USED AND UNDER THE CONDITIONS OF POLISHING, SAID OXYALKYLENE COMPOUND BEING FROM THE CLASS OF COMPOUNDS CONSISTING OF NORMALLY LIQUID POLYOXYALKYLENE GLYCOLS AND ALIPHATIC ETHERS OF SUCH GLYCOLS IN WHICH THE OXYALKYLENE GROUPS ARE FROM THE CLASS CONSISTING OF OXYLETHYLENE GROUPS, OXY-1,2-PROPYLGROUPS AND BOTH OXYETHYLENE GROUPS AND OXY-1,2-PROPYLENE GROUPS IN THE SAME MOLECULE.