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Investigation on the Corrosion Behavior of Nickel‐Base Alloys in Molten Chlorides for Sensible Heat Energy Applications
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-04-20 , DOI: 10.1002/adem.202000099 Christian Knosalla 1 , Marius Lau 1 , Lennart Schmies 1 , Wolfgang Lippmann 1 , Antonio Hurtado 1
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-04-20 , DOI: 10.1002/adem.202000099 Christian Knosalla 1 , Marius Lau 1 , Lennart Schmies 1 , Wolfgang Lippmann 1 , Antonio Hurtado 1
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Nine selected alloys are exposed in molten KCl–LiCl (eutectic composition) at 1073 K for 167 h under argon atmosphere to predict the long‐term corrosion behavior of these structural materials. The corrosive attack of each alloy is assessed with gravimetric methods, scanning electron microscopy, and energy‐dispersive X‐ray spectroscopy measurements. The corrosion rate of each alloy is calculated in accordance with ASTM G1‐03. Low chromium containing alloys as HAYNES 242, Hastelloy B‐3, and Hastelloy N revealed minor or no significant corrosive attack after molten chloride exposure. Alloy 600, Alloy 617, HAYNES 625, Hastelloy X, HAYNES 230, and HAYNES 188 with a chromium content wCr > 8% show severe corrosive attack with complete chromium depletion along the near‐surface layer and partially along grain boundaries. The results show that chromium forms chromium oxide with impurities of oxygen and water vapor at low oxygen partial pressures. This initiates an accelerated corrosion of the alloying elements in the matrix of Ni, Cr, Mo, Fe, and Co, due to chlorine formation. The influence of the composition of nickel‐base alloys on the corrosion resistance is discussed based on the comparison of the gravimetric measurements and thermodynamic calculations.
中文翻译：
显热能应用中镍基合金在熔融氯化物中的腐蚀行为研究
在氩气气氛下，将选定的9种合金在1073 K的KCl-LiCl熔融合金（共晶成分）中暴露167 h，以预测这些结构材料的长期腐蚀行为。每种合金的腐蚀侵蚀都通过重量分析法，扫描电子显微镜和能量色散X射线光谱法进行评估。每种合金的腐蚀速率均根据ASTM G1-3进行计算。暴露于熔融氯化物后，低含铬合金如HAYNES 242，Hastelloy B-3和Hastelloy N表现出轻微腐蚀或无明显腐蚀。合金600，合金617，625 HAYNES，哈氏合金X，HAYNES 230和HAYNES 188与铬含量瓦特的Cr > 8％表示严重腐蚀腐蚀，沿近表层和部分晶界完全耗尽了铬。结果表明，铬在低氧分压下与氧和水蒸气的杂质形成氧化铬。由于形成氯，这会加速镍，铬，钼，铁和钴基体中合金元素的腐蚀。基于重量测量和热力学计算的比较，讨论了镍基合金成分对耐蚀性的影响。
更新日期：2020-04-20
中文翻译：
显热能应用中镍基合金在熔融氯化物中的腐蚀行为研究
在氩气气氛下，将选定的9种合金在1073 K的KCl-LiCl熔融合金（共晶成分）中暴露167 h，以预测这些结构材料的长期腐蚀行为。每种合金的腐蚀侵蚀都通过重量分析法，扫描电子显微镜和能量色散X射线光谱法进行评估。每种合金的腐蚀速率均根据ASTM G1-3进行计算。暴露于熔融氯化物后，低含铬合金如HAYNES 242，Hastelloy B-3和Hastelloy N表现出轻微腐蚀或无明显腐蚀。合金600，合金617，625 HAYNES，哈氏合金X，HAYNES 230和HAYNES 188与铬含量瓦特的Cr > 8％表示严重腐蚀腐蚀，沿近表层和部分晶界完全耗尽了铬。结果表明，铬在低氧分压下与氧和水蒸气的杂质形成氧化铬。由于形成氯，这会加速镍，铬，钼，铁和钴基体中合金元素的腐蚀。基于重量测量和热力学计算的比较，讨论了镍基合金成分对耐蚀性的影响。
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