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- W1792832893 abstract "The formation of chemical residues on archaeological iron following its treatment in aqueous alkaline sulphite (NaOH/Na2SO3) is simulated by evaporating selected ion mixtures to dryness. The residues are identified by X-ray diffraction(XRD) and their influence on iron corrosion is investigated by mixing them with iron powder and dynamically recordingthe weight change of these powder mixtures at fixed temperature and relative humidity (RH) in a climatic chamber.Ferrous chloride was dissolved in Na2SO4 to simulate Fe2+/Cl⁻ contaminated Na2SO4 solution. This formed FeSO4·4H2O/FeSO4·7H2O/NaCl upon evaporation. Evaporating a FeCl2/NaOH/Na2SO3 solution produced either Na2SO4/NaCl/γ-FeOOH or Na6(CO3)(SO4)2/Na2SO4/NaCl/γFeOOH mixtures according to ion concentration in the initial solution.Iron powder and various residues were mixed and exposed at 75% RH and 20oC; Na2SO4/Fe did not corrode iron; FeSO4·7H2O/Fe produced minimal corrosion of iron; during the hydration phase of FeSO4·4H2O to FeSO4·7H2O ironcorroded; a NaCl/FeSO4·7H2O/FeSO4·4H2O mixture corroded iron rapidly. Overall, at 75% RH, soluble chloride residues offer a more immediate and significant corrosion risk to iron than Na2SO4 ,FeSO4·7H2O and FeSO4·4H2O." @default.
- W1792832893 created "2016-06-24" @default.
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- W1792832893 date "2011-01-01" @default.
- W1792832893 modified "2023-09-28" @default.
- W1792832893 title "Residues of alkaline sulphite treatment and their effectson the corrosion of archaeological iron objects" @default.
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