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

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    • Keywords

       

      Aluminized 1020 steel; hot corrosion; oxychloridation; sulphidation; alumina/aluminium oxide (Al$_2$O$_3$).

    • Abstract

       

      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.

    • Author Affiliations

       

      M BADARUDDIN1 SUGIYANTO1 D ASMI2

      1. Department of Mechanical Engineering, Faculty of Engineering, Universitas Lampung, Bandar Lampung 35145, Indonesia
      2. Department of Physics, Faculty of Mathematics and Natural Science, Universitas Lampung, Bandar Lampung 35145, Indonesia
    • Dates

       
  • Bulletin of Materials Science | News

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