Role of tannic acid based rust converter on formation of passive film on zinc rich coating exposed in simulated concrete pore solution

Mössbauer and infrared spectroscopy as a diagnostic tool for the characterization of ferric tannates

“…Tannins, complex mixtures of polyphenolic compounds extracted from plant materials, have continued to provoke research interests in their use as corrosion inhibitors in aqueous media [1,2], components of rust converters [3], pigments in paint coatings [4], pretreatment of reinforcement steel in concrete [5], chemical cleaning agents for removing iron deposits [6] and cement paste coloring in concretes [7] as well as many other applications. They are chemically divided into two classes: hydrolysable tannins and condensed tannins.…”

Renewable resources in corrosion resistance

“…The low pH facilitates the formation of passive hydrozincite layer within 50h of exposure to chloride contaminated concrete pore solution relative to 150h for normal zinc coating without rust converter. The mechanism of film formation was investigated by EIS, Potential-time studies, Raman Spectroscopy, SEM, energy dispersive X-ray analysis [EDXA] and X-ray diffraction studies [XRD] (Singh &Yadav, 2008). Methacrylic derivatives of TA [m-digallic acid], toluylene 2,4-diisocyanate [TDI] and 2-hydroxyethyl methacrylate [HEMA] formed UV curable urethane coatings (in molar ratio 1:3:3).…”

Preparation and Electrochemical Properties of Water-borne Inorganic Zinc-rich Coating in Hydraulic Engineering Metal Structures

“…One kind is organic zinc-rich coatings which formed by epoxy resin, modified epoxy resin and other organic coating. The other kind is inorganic zinc-rich coatings, including the alcohol soluble inorganic zinc-rich coatings formed by alkyl ester silicate materials and water-borne inorganic zinc-rich coatings with silicate materials [3]. Over the past decades, water-borne inorganic zinc-rich coatings have attracted more attention for their excellent anticorrosion and environmental performances.…”