In this work, seven commercial alloys (602CA, 310SS, 253MA, F321, F316L, 800H and 304SS) were investigated in Ar–20% CO2 gas at 650 °C under a cyclic condition (1-h reaction and 0.25-h cooling in each cycle) for up to 310 cycles. The corrosion behavior of these alloys in isothermal reaction condition was also carried out for a purpose of comparison. The results showed that nickel-based 602CA alloy stayed protective in both isothermal and cyclic reaction conditions by forming a thin protective alumina scale. However, alloys F321, F316L, 800H and 304SS all formed thick multilayered oxides with external iron-rich oxides and internal spinel oxides in all reaction conditions. Alloys 310SS and 253MA behaved protective in isothermal reaction condition but formed pitting corrosion in cyclic reaction condition. The high corrosion resistance of 310SS and 253MA was attributed to the high Cr content and the effect of other alloying elements, e.g., Si and Mn, forming additional oxide layers to enhance chromia protection. Cyclic reaction created stress on oxide scale during cooling and heating which accelerated the initiation of breakaway corrosion of these alloys. Carburization due to CO2 reaction was identified for F321, F316L and 304SS, but not for other alloys because of the formation of highly protective alumina or chromia scales.

中文翻译：

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循环反应对含铬合金在 650 °C CO2 气体中腐蚀行为的影响

在这项工作中，在循环条件下（1 小时反应和 0.25 小时冷却）在 650 °C 的 Ar–20% CO2 气体中研究了七种商业合金（602CA、310SS、253MA、F321、F316L、800H 和 304SS）。每个循环）最多 310 个循环。为了比较的目的，还进行了这些合金在等温反应条件下的腐蚀行为。结果表明，镍基 602CA 合金在等温和循环反应条件下通过形成薄的保护性氧化铝氧化皮来保持保护性。然而，合金 F321、F316L、800H 和 304SS 在所有反应条件下都与外部富铁氧化物和内部尖晶石氧化物形成厚的多层氧化物。合金310SS和253MA在等温反应条件下具有保护作用，但在循环反应条件下形成点蚀。310SS 和 253MA 的高耐腐蚀性归因于高 Cr 含量和其他合金元素（例如 Si 和 Mn）的作用，形成额外的氧化层以增强氧化铬保护。循环反应在冷却和加热过程中在氧化皮上产生应力，加速了这些合金开始腐蚀的发生。F321、F316L 和 304SS 因 CO2 反应导致渗碳，但其他合金没有，因为形成了高度保护的氧化铝或氧化铬鳞片。