High-resolution and in-situ characterization of the material behavior of Fe-based CrNiMo alloys exposed to geothermal-type fluids
暴露于地热型流体的铁基 CrNiMo 合金材料行为的高分辨率原位表征
基本信息
- 批准号:290015776
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Fellowships
- 财政年份:2015
- 资助国家:德国
- 起止时间:2014-12-31 至 2017-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In applications where corrosion is a critical factor, typically corrosion-resistant and relatively inexpensive Fe-based CrNiMo alloys are employed. Among these materials, austeno-ferritic duplex alloys are particularly promising for a wide range of applications and are regarded as showcases for the importance of microstructure on the corrosion behavior. The proposed research aims at studying the behavior of duplex alloys, simpler model systems (austenite, ferrite), and elemental reference materials (Cr, Mo) under conditions relevant to geotechnical applications (e.g. utilization of geothermal energy, CO2 storage, nuclear waste disposal).Reflecting the current state of geothermal research, corrosion environments with temperatures up to 300°C are mimicked in the lab. Multi-component fluids (Na-K-Ca-Mg-Cl-SO4-H2O system) with varying TDS (total dissolved solids) that closely resemble real world fluids from geothermal sites in Germany are synthesized. Such corrosion environments have not yet been adequately researched, but are crucial for future subsurface activities.Central aspects are:- Testing the stability limits of the test alloys in geothermal corrosion environments- Studying the fundamental processes with regard to passivity/breakdown of passivityInstead of just prioritizing the macroscopic corrosion resistance, a special emphasis is laid upon the interfacial reactivity, which requires a combination of electrochemical (cyclic voltammetry CV, impedance spectroscopy EIS), spectroscopic (in-situ surface-enhanced Raman spectroscopy SERS), and microscopic methods (atomic force microscopy AFM) to be employed. CV and EIS are used to determine the thermodynamic domains of the test alloys and to probe the passive film with respect to its electronic properties and protectiveness. SERS enables to quasi-continuously monitor the dynamic of growth and modification of the passive film, while the sample is kept under potentiostatic or -dynamic control. Compositional and structural changes will reveal breakdown mechanisms (e.g. chloride-induced pitting) resulting in high local dissolution rates. AFM and in-situ hydrothermal AFM (HAFM) are employed for sub-nanometer scale surface characterization, HAFM being capable of real-time imaging at up to 150°C.Following an interdisciplinary approach, the project encompasses a range from fundamental to applied research and provides valuable insights into the dynamic electrochemical and physical behavior of CrNiMo alloys exposed to fluids with varying TDS in an application-relevant temperature range. On the basis of an deeper understanding of the interfacial dynamic, it assesses the suitability of important alloy representatives and helps to improve the corrosion resistance. Due to the superior nature of in-situ techniques and the synergistic combination of methods, the results have a high relevance for material assessment, not solely limited to the alloys and environments considered in this study.
在腐蚀是关键因素的应用中,通常采用耐腐蚀且相对便宜的铁基CrNiMo合金。在这些材料中,奥氏体-铁素体双相合金在广泛的应用中特别有前途,并且被认为是微观结构对腐蚀行为的重要性的展示。该研究旨在研究双相合金、较简单的模型系统(奥氏体、铁素体)和元素参考材料(Cr、Mo)在与岩土工程应用相关的条件下(例如地热能利用、CO2储存、核废料处理)的行为。反映地热研究的现状,在实验室中模拟温度高达300°C的腐蚀环境。合成了与德国地热场的真实的世界流体非常相似的具有不同TDS(总溶解固体)的多组分流体(Na-K-Ca-Mg-Cl-SO 4-H2O体系)。这种腐蚀环境尚未得到充分的研究,但对未来的地下活动至关重要。核心方面是:-测试测试合金在地热腐蚀环境中的稳定性极限-研究钝化/钝化破坏的基本过程不是只优先考虑宏观耐腐蚀性,而是特别强调界面反应性,这需要结合电化学(循环伏安CV,阻抗谱EIS),光谱(原位表面增强拉曼光谱Sers)和微观方法(原子力显微镜AFM)来使用。CV和EIS用于确定测试合金的热力学域,并探测钝化膜的电子性质和保护性。Sers能够准连续地监测钝化膜的生长和改性的动态,而样品保持在恒电位或动态控制下。成分和结构变化将揭示导致高局部溶解速率的分解机制(例如氯化物诱导的点蚀)。AFM和原位水热AFM(HAFM)用于亚纳米尺度的表面表征,HAFM能够在高达150°C的温度下实时成像。该项目采用跨学科的方法,涵盖了从基础到应用研究的范围,并提供了对CrNiMo合金在应用相关温度范围内暴露于具有不同TDS的流体的动态电化学和物理行为的有价值的见解。在深入了解界面动态的基础上,它评估了重要合金代表的适用性,并有助于提高耐腐蚀性。由于原位技术的上级性质和方法的协同组合,结果与材料评估具有高度相关性,不仅限于本研究中考虑的合金和环境。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Corrosion of carbon steel and the passivating properties of corrosion films formed under high-PT geothermal conditions.
- DOI:10.1016/j.scitotenv.2019.04.386
- 发表时间:2019-08
- 期刊:
- 影响因子:0
- 作者:N. Mundhenk;K. Knauss;S. Bandaru;R. Wonneberger;T. Devine
- 通讯作者:N. Mundhenk;K. Knauss;S. Bandaru;R. Wonneberger;T. Devine
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