Two-step sealing of anodized aluminum coatings

A method comprising:

• providing a workpiece with at least one surface having an anodized aluminum coating and a trivalent chromium sealant;
• submerging the at least one surface of the workpiece in a post-treatment sealing solution for 0.5 to 20 minutes, the sealing solution comprising:
• a corrosion inhibitor formulation;
• a water soluble polymer;
• an organic complexing agent;
• an oxidant;
• and
• water;
• wherein the corrosion inhibitor formulation is formulated from at least one anodic corrosion inhibitor compound, at least one cathodic corrosion inhibitor compound, or a combination thereof;
• and wherein a concentration of each of the at least one anodic corrosion inhibitor compound, the at least one cathodic corrosion inhibitor compound, or the combination thereof, the corrosion inhibitor formulation, the water soluble polymer, the organic complexing agent, and the oxidant is each in a range of 1-50 mM based on the sealant composition.