Patent ID: 8361630
Filing Date: 2013-01-29
Classification: C23C,C25D,Y10T

Abstract:
1. An article having a metal surface comprised of aluminum or aluminum alloy and an oxide coating deposited on said metal surface according to a method comprising: A) providing an anodizing solution comprised of water and one or more additional components selected from the group consisting of: B) providing a cathode in contact with said anodizing solution; C) placing a article having a metal surface comprised of aluminum or aluminum alloy as an anode in said anodizing solution; D) passing a current between the anode and cathode through said anodizing solution for a time effective to form an adherent, first protective coating on the metal surface of the article; E) removing the article having a first protective coating from the anodizing solution and optionally drying said article; and F) applying one or more layers of paint to the first protective coating, at least one of said layers comprising PTFE or silicone, to form a second protective coating; wherein the current is pulsed direct current having a peak voltage of 300-600 volts.