Articles written in Bulletin of Materials Science

    • High-temperature corrosion of aluminized-AISI 1020 steel with NaCl and Na$_2$SO$_4$ deposits


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      High-temperature corrosion of aluminized-American Iron and Steel Institute (AISI) 1020 steel with sodium chloride (NaCl) and sodium sulphate (Na$_2$SO$_4$) deposits was studied using isothermal oxidization in a dry air environment at 700$^{\circ}$C for 49 h. NaCl and Na$_2$SO$_4$ deposits on the aluminide layer interfered with protective alumina/aluminium oxide(Al$_2$O$_3$) scale formation on the steel substrate. Chlorine and sulphur gases (Cl$_{2g}$ and S$_g$, respectively) released into the atmosphere corroded the protective Al$_2$O$_3$ layer. Corrosion of the Al$_2$O$_3$ layer was also due to local formation of iron oxide (Fe$_2$O$_3$). Fe$_2$O$_3$ growth is attributed to ferric chloride (FeCl$_3$) vaporization. S$_g$ diffusion into the Al$_2$O$_3$ scale via Al$^{3+}$ vacancy defects led to the formation of aluminium sulphide on the aluminide layer surface. Cl and S consequently induced hot corrosion of the aluminized steel, thereby increasing cyclic oxychloridation and sulphidation rates at high temperatures.

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