Abstract
High-temperature corrosion of aluminized-American Iron and Steel Institute (AISI) 1020 steel with sodium chloride (NaCl) and sodium sulphate (\({\hbox {Na}}_{2} {\hbox {SO}}_{4}\)) deposits was studied using isothermal oxidization in a dry air environment at \(700{^{\circ }}\hbox {C}\) for 49 h. NaCl and \({\hbox {Na}}_{2} {\hbox {SO}}_{4}\) deposits on the aluminide layer interfered with protective alumina/aluminium oxide (\({\hbox {Al}}_{2} {\hbox {O}}_{3}\)) scale formation on the steel substrate. Chlorine and sulphur gases (\({\hbox {Cl}}_{\mathrm{2g}}\) and \({\hbox {S}}_{\mathrm{g}}\), respectively) released into the atmosphere corroded the protective \({\hbox {Al}}_{2}{\hbox {O}}_{3}\) layer. Corrosion of the \({\hbox {Al}}_{2}{\hbox {O}}_{3}\) layer was also due to local formation of iron oxide (\({\hbox {Fe}}_{2}{\hbox {O}}_{3}\)). \({\hbox {Fe}}_{2}{\hbox {O}}_{3}\) growth is attributed to ferric chloride (\({\hbox {FeCl}}_{3}\)) vaporization. \({\hbox {S}}_{\mathrm{g}}\) diffusion into the \({\hbox {Al}}_{2} {\hbox {O}}_{3}\) scale via \({\hbox {Al}}^{3+}\) 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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The authors thank the Ministry of Research, Technology, and Higher Education of the Republic of Indonesia for financial support via the Incentive Research System of National Innovation and the National Strategy Research grant under contract number 529/UN26/8/LPPM/2016–2017.
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Badaruddin, M., Sugiyanto & Asmi, D. High-temperature corrosion of aluminized-AISI 1020 steel with NaCl and \({\hbox {Na}}_{2}{\hbox {SO}}_{4}\) deposits. Bull Mater Sci 43, 11 (2020). https://doi.org/10.1007/s12034-019-1984-0
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DOI: https://doi.org/10.1007/s12034-019-1984-0