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Observations on Accelerated Oxidation of a Ferritic Stainless Steel Under Dual Atmosphere Exposure Conditions

机译：双气氛暴露条件下铁素体不锈钢加速氧化的观察

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Iron-base alloys, conventionally used for the fabrication of cell-to-cell interconnects, undergo localized oxide scale overgrowth when exposed to a bipolar atmospheric condition, in which one side of the metal is exposed to a reducing gas and the opposing side is exposed to an oxidant. The phenomenon, coined "dual atmosphere corrosion", is prevalent in many electrochemical and thermochemical systems where separation of fuel and oxidant gas streams is required. It is apparent that hydrogen exposure and the existence of a dual atmosphere plays a key role, as metals exposed to single atmospheres of reducing or oxidizing gases do not show the extent of oxide scale overgrowth. The exact role that hydrogen plays in accelerated iron oxide growth on the air-exposed side of metals, however, remains largely unknown. Experimental results from oxidation tests conducted on a select ferritic stainless steel under dual atmosphere exposure conditions are presented. After 50 h in dual atmosphere, the ferritic steel had an extensive iron oxide scale with a particular needle-like growth morphology. In comparison, the same steel in dry air for 50 h only showed uniform scale growth and absence of iron oxide nodules. These results along with thermodynamic driving forces are discussed in regard to metal oxidation and active species involved in oxidation. Current hypotheses regarding the role of hydrogen in dual atmosphere corrosion are also discussed.
机译：通常用于制造细胞对细胞互连的铁基合金，当暴露于双极大气条件时经历局部化的氧化物尺度过度生长，其中金属的一侧暴露于还原气体，并且相对的侧面暴露到氧化剂。在许多电化学和热化学系统中普遍存在的许多电化学和氧化剂气流中，普遍存在的现象。显而易见的是，氢暴露和双气氛的存在起关键作用，因为暴露于减少或氧化气体的单个大气的金属没有显示氧化物尺度过度生长的程度。然而，氢在金属暴露侧的加速氧化铁生长中发挥的确切作用仍然很大程度上是未知的。提出了在双气氛暴露条件下在选择铁素体不锈钢上进行的氧化试验的实验结果。在双气氛中50小时后，铁素体钢具有广泛的氧化铁尺，具有特定的针状生长形态。相比之下，50小时干燥空气中相同的钢仅显示均匀的规模生长和氧化铁结节的不存在。关于氧化的金属氧化和活性物质，讨论了这些结果以及热力驱动力。还讨论了关于氢在双气氛腐蚀中的作用的当前假设。

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