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DSC study of the deposition reactions of zinc pack coatings up to 550°C

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Abstract

Zn pack coating formation takes place in three steps as differential scanning calorimetry shows. The initial step (at 193.9°C) is endothermic and involves the transformation of α-NH4Cl to β-NH4Cl and the NH4Cl decomposition to NH3 and HCl. During the second step (at 248.6°C), which is exothermic, Zn2+ salts are formed and most probably ZnCl2. Finally at 264.1°C (endothermic reaction) it seems that ZnCl2 is decomposed to form Zn that is deposited on the ferrous substrate. The as-cast Zn diffuses in the iron substrate forming the gamma and delta phase of the Fe–Zn phase diagram. Al2O3 is not involved in the above-mentioned mechanism and acts only as filler.

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Authors and Affiliations

  1. Physics Department, Aristotle University of Thessaloniki, Thessaloniki, Greece

    Pistofidis N., Vourlias G., Chaliampalias D., Pavlidou E., Chrissafis K., Stergioudis G. & Polychroniadis E. K.

  2. Department of Mechanical Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece

    Tsipas D.

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  1. Pistofidis N.
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  2. Vourlias G.
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  3. Chaliampalias D.
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  4. Pavlidou E.
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  5. Chrissafis K.
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  6. Stergioudis G.
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  7. Polychroniadis E. K.
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  8. Tsipas D.
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Correspondence to Polychroniadis E. K..

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Pistofidis, N., Vourlias, G., Chaliampalias, D. et al. DSC study of the deposition reactions of zinc pack coatings up to 550°C. J Therm Anal Calorim 84, 191–194 (2006). https://doi.org/10.1007/s10973-005-7196-4

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  • DOI: https://doi.org/10.1007/s10973-005-7196-4

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