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RESEARCH PRODUCT

Heterogeneous crystallization of zinc hydroxystannate on galvanized steel for enhancing the bond strength at the rebar/concrete interface

Bartolomeo MegnaMonica SantamariaAndrea ZafforaFrancesco Di Franco

subject

Materials scienceCarbon steelGeneral Chemical EngineeringCorrosion resistanceRebarchemistry.chemical_element02 engineering and technologyZincengineering.material010402 general chemistry01 natural sciencesIndustrial and Manufacturing Engineeringlaw.inventionCorrosionCathodic protectionsymbols.namesakeHot-dip galvanizinglawEnvironmental ChemistryCrystallizationComposite materialBond strengthZinc hydroxystannateBond strengthGeneral Chemistry021001 nanoscience & nanotechnologyGalvanization0104 chemical sciencesSettore ING-IND/23 - Chimica Fisica ApplicatachemistryengineeringsymbolsCrystallization0210 nano-technologyConcrete

description

Abstract Zinc hydroxystannate (ZnSn(OH)6) coatings were deposited on galvanized carbon steel samples by an electroless heterogeneous crystallization process. Structural and morphological features of the coatings as a function of the immersion time were determined by X-ray diffraction, Raman Spectroscopy and Scanning Electron Microscopy revealing the presence of truncated octahedrons of crystalline ZnSn(OH)6. Electrochemical characterization in a simulated concrete pore solution without and with addition of chloride ions proved that the cathodic protection is preserved and that ZnSn(OH)6 improved the corrosion resistance of the rebars. Pull-out tests demonstrated an enhanced bond strength at the rebar/concrete interface and, thus, an improved adhesion after the heterogeneous crystallization process.

yearjournalcountryeditionlanguage
2021-02-01Chemical Engineering Journal
https://doi.org/10.1016/j.cej.2020.126943