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.

中文翻译：

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含 NaCl 和 $${\hbox {Na}}_{2}{\hbox {SO}}_{4}$$Na2SO4 沉积物的镀铝 AISI 1020 钢的高温腐蚀

镀铝美国钢铁协会 (AISI) 1020 钢与氯化钠 (NaCl) 和硫酸钠 (\({\hbox {Na}}}_{2} {\hbox {SO}}_{4) 的高温腐蚀}\)) 沉积物在干燥空气环境中以 \(700{^{\circ }}\hbox {C}\) 等温氧化 49 小时进行研究。NaCl 和 \({\hbox {Na}}_{2} {\hbox {SO}}_{4}\) 沉积在铝化物层上，会干扰保护性氧化铝/氧化铝 (\({\hbox {Al}} _{2} {\hbox {O}}_{3}\)) 在钢基材上形成水垢。氯气和硫气（分别为\({\hbox {Cl}}_{\mathrm{2g}}\) 和\({\hbox {S}}_{\mathrm{g}}\)）释放到大气腐蚀了保护层\({\hbox {Al}}_{2}{\hbox {O}}_{3}\)。\({\hbox {Al}}_{2}{\hbox {O}}_{3}\) 层的腐蚀也是由于局部形成氧化铁 (\({\hbox {Fe}}_ {2}{\hbox {O}}_{3}\))。\({\hbox {Fe}}_{2}{\hbox {O}}_{3}\) 生长归因于氯化铁 (\({\hbox {FeCl}}_{3}\)) 蒸发. \({\hbox {S}}_{\mathrm{g}}\) 扩散到 \({\hbox {Al}}_{2} {\hbox {O}}_{3}\) 尺度通过\({\hbox {Al}}^{3+}\) 空位缺陷导致在铝化物层表面形成硫化铝。因此，Cl 和 S 会引起镀铝钢的热腐蚀，从而增加高温下的循环氧氯化和硫化速率。