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- W2052390311 abstract "Boric‐sulfuric acid anodized (BSAA) aluminum alloys have been sealed in hot solutions of cerium or yttrium salts. For comparison, sealing has also been performed in the presently used dilute chromate solution, boiling water, and a cold nickel fluoride solution. The corrosion resistance of the sealed BSAA Al alloys Al 2024, Al 6061, and Al 7075 has been evaluated by recording impedance spectra during exposure in 0.5 N NaCl for 7 days. Shorter or longer exposure times have also been used depending on the corrosion resistance obtained by different sealing processes. From the impedance spectra the time dependence of the pore resistance, Rpo, and the specific admittance, As, has been determined. At the end of the exposure the pitted area, Apit, was calculated. The relationship between As and Rpo has been evaluated. Two different sealing mechanisms were detected. For sealing in dilute chromate the pores in the outer oxide layer stayed open, while for hot water sealing or sealing in cold nickel fluoride the pores were closed by an oxide/hydroxide. Sealing of BSAA Al alloys in cerium or yttrium salt solutions occurred according to one of these two mechanisms depending on alloy type and solution composition. Based on the experimental values of Rpo, As, and Apit it was concluded that sealing in cerium nitrate and yttrium sulfate solutions provided corrosion resistance similar to that of chromate‐sealed BSAA Al alloys." @default.
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- W2052390311 date "1998-08-01" @default.
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- W2052390311 title "Sealing of Anodized Aluminum Alloys with Rare Earth Metal Salt Solutions" @default.
- W2052390311 doi "https://doi.org/10.1149/1.1838716" @default.
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