Molybdate was adsorbed onto ion exchange resin based on poly (styrene-co-divinyl benzene) matrix with diethanolamine and 1-deoxy-1-(methylamino)-D-glucitol functional groups. The maximum sorption capacity was determined from Langmuir isotherms and breakthrough capacity from dynamic column sorption. The effects of pH, the initial form of the ion exchange resin, and of competitive sorption of sulphates and chlorides onto sorption capacities were determined. Ion exchange resin having 1-deoxy-1-(methylamino)-D-glucitol functional group showed higher breakthrough capacity and higher tolerance to competitive sorption of sulphates and chlorides than ion exchange resin having diethanolamine functional group. Molybdate was easily stripped from both ion exchange resins with 10 bed volumes of 1 mol/L NaOH solution.
Purpose -This work aims to focus on evaluation of the ability of cathodically deposited ZrO 2 -based coatings to stabilise the surface of silver against tarnishing caused by S 22 -based species and comparison of these coatings with Cr oxide-based coating. Design/methodology/approach -The coatings were evaluated using inductively coupled plasma optical emission spectroscopy (ICP-OES), scanning electron microscopy (SEM), impedance spectroscopy (EIS) and galvanostatic reduction of specimens exposed to H 2 S vapours. Findings -The kinetics of deposition were studied and optimum conditions for coating formation were determined. The options of manual application suitable for practical use were studied also. Zr specimens showed better barrier properties than did a chromated specimen. The best properties were observed on a specimen with a manually fast-applied coating. However, Zr coating does not provide as good protection from tarnishing as chromate. The structure of the Cr coating contains species of chromate that oxidize species of S 22 . Originality/value -The paper provides new information regarding the anticorrosive properties of cathodically deposited ZrO 2 coating as an alternative to Cr coating for the preservation of silver surfaces.
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