SEALING PROCESS FOR AN ANODIZED ALUMINUM-ALLOY SURFACE

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A sealing process (30) includes applying a first reactant to a substrate (12) having a porous structure (16) , the first reactant (18) comprising a chromium (III) precursor and a transition metal precursor and applying a second reactant (22) to the first reactant, the second reactant comprising a rare earth element precursor and an alkaline earth element precursor to form reservoirs of trivalent chromium in pore space of the porous structure, and a physical barrier (30) over the substrate and the reservoirs.