The Impact of HCl on Alkali-Induced Corrosion of Stainless Steels/FeCrAl Alloy at 600 °C: The Story After Breakaway

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Oxidation of Metals Pub Date : 2024-07-22 DOI:10.1007/s11085-024-10265-8

Vicent Ssenteza, Torbjörn Jonsson, Johanna Nockert, Jesper Liske

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Abstract

The impact of Cl on alkali-induced high-temperature corrosion of stainless steels/FeCrAl alloys after breakaway oxidation was investigated in a simulated biomass- and waste-fired boiler environment at 600 °C. For this investigation, three alloys were exposed to low Cl load environment (H₂O+KCl) and to high Cl load (H₂O+KCl+HCl). Post-exposure analysis showed that the stainless steel SVM12 experiences fast oxidation and forms thick double-layered Fe-rich oxide scales. The corrosion attack is further accelerated with addition of HCl for this material with the effect being more pronounced in the inward-growing scale. The FeCrAl and FeCrNi alloys exhibit slower oxidation kinetics after the breakaway corrosion compared to SVM12 in the H₂O+KCl exposure. Furthermore, in contrast with SVM12, the addition of HCl did not accelerate the corrosion attack on these alloys. It is argued that the properties of the secondary oxide layer formed after breakaway corrosion are important in the continued corrosion resistance against chlorine-induced corrosion attack. Especially, the Cr content in the inner scales is suggested to be important in corrosion mitigation.

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盐酸对 600 °C 下不锈钢/铁铬铝合金碱诱导腐蚀的影响：断裂后的故事

在 600 °C的模拟生物质和废物燃烧锅炉环境中，研究了Cl对不锈钢/铁铬铝合金断裂氧化后碱诱导高温腐蚀的影响。在这项研究中，三种合金分别暴露于低 Cl 负荷环境（H2O+KCl）和高 Cl 负荷环境（H2O+KCl+HCl）。暴露后的分析表明，不锈钢 SVM12 经历了快速氧化，形成了厚厚的双层富铁氧化物鳞片。加入盐酸后，该材料的腐蚀速度进一步加快，在向内生长的鳞片中效果更为明显。在 H2O+KCl 暴露条件下，与 SVM12 相比，FeCrAl 和 FeCrNi 合金在脱离腐蚀后的氧化动力学速度较慢。此外，与 SVM12 不同的是，加入 HCl 不会加速这些合金的腐蚀。有观点认为，断裂腐蚀后形成的二次氧化层的特性对于持续抵抗氯引起的腐蚀侵蚀非常重要。尤其是内部鳞片中的铬含量对减缓腐蚀具有重要作用。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

期刊介绍： Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.