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Development of Corrosion Resistant Alloys for Municipal Waste Incinerators

城市垃圾焚烧炉用耐腐蚀合金的开发

基本信息

批准号：
06650794
负责人：
NISHIKATA Atsushi
金额：
$ 1.09万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Corrosion performance of eighteen commercial and thirteen lab-melted alloys have been evaluated in three different molten salts in the temperature range 723 to 873K in order to select materials to be employed in municipal waste incinerator environments. The evaluation was performed using an AC impedance screening test which was developed in this study as an instrument for rapid evaluation of hot corrosion. The most promising candidate alloys have been selected in each melt, and subsequently evaluated in a conventional salt coating test. The corrosion data obtained in AC impedance screening tests has been analyzed by a multiple linear regression method in order to clarify the effect of alloy elements on the corrosion performance.From the AC impedance corrosion screening test and salt coating tests of thirty one alloys in the sulfate, the chloride and the chloride/sulfate environments, the following results were drawn :1.In the chloride containing environments, high Cr and high Mo alloys indicated excellent corrosion performance, while in the sulfate environment, high Cr and Mo-free alloys showed excellent corrosion resistance.2.Alloy 625 and Alloy C-22 were selected as most excellent corrosion resistant materials in the simulated municipal waste incinerator environments.3.Poor corrosion resistant alloys tend to show an acceleration of corrosion rate with an increase in water content in both the sulfate and chloride melts. Meanwhile, it seems that an increase of water content reduced the corrosion rates in the sulfate/chloride melt. In general, a change in the water content provided no significant difference in the rankings of corrosion performance of the alloys in the employed melts.4.The results obtained from AC impedance testing were in good agreement with those from conventional salt coating test. The electrochemical screening test system developed in this study was found to be very useful as a rapid evaluation method for molten salt corrosions.

为了选择在城市垃圾焚烧炉环境中使用的材料，在723至873 K的温度范围内，在三种不同的熔融盐中评估了18种商业合金和13种实验室熔融合金的腐蚀性能。使用交流阻抗筛选试验，这是在这项研究中开发的工具，用于快速评估热腐蚀进行评估。最有前途的候选合金已被选择在每个熔体，并随后在传统的盐涂层测试进行评估。为了明确合金元素对腐蚀性能的影响，对31种合金在硫酸盐、氯化物和氯化物/硫酸盐环境中的交流阻抗腐蚀屏蔽试验和盐膜试验数据进行了多元线性回归分析，得出以下结论：1.在含氯离子的环境中，高Cr和高Mo合金表现出优异的腐蚀性能，而在硫酸盐环境中，高Cr和无Mo的合金显示出优异的耐腐蚀性。2. 625合金和C-在模拟城市垃圾焚烧炉环境中，22种合金被选为最佳耐蚀材料。硫酸盐和氯化物熔体中的水含量增加。同时，它似乎是增加的水含量降低硫酸盐/氯化物熔体中的腐蚀速率。总的来说，水含量的变化对合金在所用熔体中的腐蚀性能的排名没有显著影响。4.交流阻抗测试结果与常规盐膜测试结果一致。本研究所开发之电化学筛选测试系统，可作为熔盐腐蚀快速评估之一。