In-situ Observation of Initial Reaction Stages of Hot-Corrosion

热腐蚀初始反应阶段的原位观察

• 批准号: 03452252
• 负责人: NARITA Toshio
• 金额: $ 3.01万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452252/
• 关键词: Hot corrosion; In-situ observation; Sulfidation; Hot stage; Fused salt; Melting phenomena; boundary corrosion; boiler-turbine; 差動排気; 試料加熱台; ボイラ; タービン; 腐食、その場観察; ホットコロ-ジョン; その場観察; 高温腐食; 低真空差動排気システム

In oil fired boiler and gas turbine systems high-temperature hot corrosion is increasing concerns, because of its aggressiveness. Mechanisms of the hot corrosion have been studied by using electrochemistry and fused salt chemistry, whereas there is little information on the initial stage of the hot corrosion.In this research project the scanning electron microscope was developed to observe the melting process in various corrosion environments.The results obtained are summarized as follows.(1) Differential evacuation system was installed to SEM in order to keep sample chamber in various corrosion environments. (2) Hot stage was installed, heating up to 500ﾟC. (3) Several samples, alloy with low melting temperature of 90ﾟC, mixed salt of ZnCl_2-KCl with 200ﾟC m.p., and pure tin metal with 231ﾟC m.p., were observed in the low air pressure and the melting and solidifing processes were observed clearly. However, details of the melting process was not observed because of rapid change in states. In order to overcome this difficulty. the video-monitoring system should be needed. (4) Sulfidation process of Fe-Cr alloys was investigated in low sulfur pressures in order to elucidate the mechanism of grain boundary attack. (5) Gaseous corrosion associated with sulfidation was summarized and critically reviewed.

在燃油锅炉和燃气轮机系统中，高温热腐蚀因其侵蚀性而日益受到关注。利用电化学和熔盐化学研究了热腐蚀的机理，但关于热腐蚀初始阶段的信息很少。本研究项目开发了扫描电子显微镜来观察各种腐蚀环境下的熔化过程。获得的结果总结如下：(1)在SEM上安装了差速抽真空系统，以使样品室保持在各种腐蚀环境中。 (2)安装热台，加热至500℃。 (3) 在低气压下对熔点为90℃的低熔点合金、熔点为200℃的ZnCl_2-KCl混合盐、熔点为231℃的纯锡金属等样品进行了观察，可以清楚地观察到熔点和凝固过程。然而，由于状态的快速变化，没有观察到熔化过程的细节。为了克服这个困难。应该需要视频监控系统。 (4)研究了低硫压力下Fe-Cr合金的硫化过程，以阐明晶界侵蚀的机理。 (5)对与硫化相关的气体腐蚀进行了总结和批判性评论。

项目成果

Shigeshiro Kawamori: "Grain Boundary Sulfidation of Stainless Steels" Report on HMM-123 Branch. Vol.33. 267-281 (1992)

Shigeshiro Kawamori：《不锈钢的晶界硫化》关于 HMM-123 分支的报告。

川森重弘: "ステンレス鋼の粒界硫化腐食挙動" 耐熱金属材料第123委員会研究報告. 33. 267-281 (1992)

Shigehiro Kawamori：“不锈钢的晶间硫化物腐蚀行为”第123届耐热金属材料委员会研究报告33. 267-281（1992）。

K.Przybylski: "Kinetics and Mechanism of High-Temeprature Sulfidation of an Fe-23.4Cr-18.6Al Alloy in H_2S-H_2 atmopsheres" J.Oxidation od Metals. 38. 1-32 (1992)

K.Przybylski：“Fe-23.4Cr-18.6Al 合金在 H_2S-H_2 气氛中高温硫化的动力学和机理”J.Oxidation od Metals。

K.Przybylski: "Kinetics and Mechanism of High-Temperature Sulfidation of an Fe-23.4Cr-18.6Al Alloy in H_2S-H_2 atmospheres" J. Oxidation of Metals. Vol.38. 1-32 (1992)

K.Przybylski：“Fe-23.4Cr-18.6Al 合金在 H_2S-H_2 气氛中高温硫化的动力学和机理”J.金属的氧化。

T.Narita: "Sulfidation Properties of Low Alloy Steels in H_2S-H_2 Atmospheres" Proceedings of HTC of Advanced Materials. Vol.1. 155-162 (1992)

T.Narita：“H_2S-H_2 气氛中低合金钢的硫化性能”先进材料 HTC 论文集。