动态液态金属Galinstan在高达150°C的温度下对S31600/SS316不锈钢的腐蚀效果

IF 1.1 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Lijun Wu, P. Geddis, Kun Liu, J. Hiscocks, William Courchesne
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引用次数: 0

摘要

一项腐蚀研究测试了不锈钢S31600/SS316在150°C的动态条件下暴露于液态金属galinstan和气体(包括氮气、正戊烷、异丁烷和R245fa) 3.5、9.5和20.5天后的腐蚀情况。将部分充满galinstan和气体的安瓿不断搅拌,以产生仅气体,气体-液体和仅液体的暴露区域。测试后检查使用各种定性和定量方法(目视观察、带有能量色散x射线光谱的扫描电子显微镜、表面轮廓测量和化学分析)来评估样品和galinstan样品的腐蚀证据。在有气体暴露的区域,没有检测到腐蚀。在液相区,氮和异丁烷组分集中在晶界,而正戊烷组分分散在晶界;在R245fa晶片上发现氧化镓层。在液气界面区域,正戊烷、异丁烷分别在20.5天、9.5天和20.5天腐蚀严重;R245fa合金在9.5 d合金上出现了细小的分散腐蚀,而在20.5 d合金上则没有。轮廓分析结果表明,正戊烷的粗糙度变化最小,氮的粗糙度变化最大,其次是异丁烷,R245fa的粗糙度变化最大。在有制冷剂存在和动态条件下,化学反应与不锈钢晶界上galinstan或氧化镓元素的微偏析相结合,可以增强对不锈钢的晶间攻击。需要进一步的工作来确定和解释这种腐蚀机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Corrosion Effect of Dynamic Liquid Metal Galinstan on Stainless Steel S31600/SS316 in the Presence of Selected Refrigerants at Temperatures up to 150 °C
A corrosion study examined stainless steel S31600/SS316 after exposure to the liquid metal galinstan and gases including nitrogen, n-pentane, isobutane and R245fa at 150 °C under dynamic conditions for 3.5, 9.5 and 20.5 days. Ampules partly filled with galinstan and the gas were continuously stirred to create regions of gas-only, gas-liquid, and liquid-only exposure. Post test examinations used a variety of qualitative and quantitative methods (visual observation, scanning electron microscopy with energy dispersive X-ray spectroscopy, surface profilometry and chemical analysis) to evaluate coupons and galinstan samples for evidence of corrosion. In the gas-exposed region, no corrosion was detected in any coupon. In the liquid region, galinstan constituents were found to be localized to grain boundaries for nitrogen and isobutane coupons but dispersed on n-pentane coupons; a gallium oxide layer was found on R245fa coupons. In the liquid-gas interface region, severe corrosion was found on the n-pentane 20.5-day and the isobutane 9.5 and 20.5-day coupons; fine scattered corrosion on the R245fa 9.5-day coupon but not on the 20.5-day coupon was observed. Profilometry results indicated the least roughness change for coupons in n-pentane, a higher change in nitrogen, then in isobutane, and the highest in R245fa. In the presence of refrigerants and under dynamic conditions, intergranular attack on stainless steel may be enhanced by chemical reactions combined with microsegregation of galinstan or gallium oxide elements on stainless steel grain boundaries. Further work is required to confidently identify and explain this corrosion mechanism.
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来源期刊
Canadian Journal of Chemistry
Canadian Journal of Chemistry 化学-化学综合
CiteScore
1.90
自引率
9.10%
发文量
99
审稿时长
1 months
期刊介绍: Published since 1929, the Canadian Journal of Chemistry reports current research findings in all branches of chemistry. It includes the traditional areas of analytical, inorganic, organic, and physical-theoretical chemistry and newer interdisciplinary areas such as materials science, spectroscopy, chemical physics, and biological, medicinal and environmental chemistry. Articles describing original research are welcomed.
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