A Basic Study of Developing Refractory Metals for Waste Burner

开发垃圾焚烧炉用难熔金属的基础研究

基本信息

批准号：
04650642
负责人：
HARA Motoi
金额：
$ 1.15万
依托单位：
Akita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

High temperature corrosion behaviors of various metals were examined in an atmosphere including HCI by a thermogravimetric apparatus.For pure Fe, the corrosion rate at 700ﾟC in the atmosphere including HCI was higher than that in pure O_2. However, the corrosion rate above 900ﾟC was lower in the atmosphere including HCI in spite of the formation of a volatile FeCl_2. These phenomena were due to the simulaneous progress of oxidation and chlorination of Fe.For pure Cr. the formation of Cr_2O_3 was tremendously accelerated in the temperature region from 750ﾟC to 850ﾟC in the atmosphere including HCI.However, in the other temperature region the corrosion rate was almost the same as that in pure O_2. These were thought to be attributed to the fact that the formation of CrCl_2 playd an important role on the corrosion behavior.For pure Ni, the corrosion proceeded with a decrease in mass of the specimen due to the fotmation of a volatile NiCl_2 at the temperatures from 700ﾟC to 1000ﾟC in the atmosphere including HCl. A thin NiO scale layr was observed on the specimen after the test. The corrosion rate in an 1%HCl atmosphere was higher than in pure O_2. These suggested that the corrosion in the atmosphere including HCI was attributable to both oxidation and chlorination of Ni.For Fe-Cr alloys, the corrosion rate in an 1%HCl atmosphere was decreased with an increase in Cr content. For the alloys containing several percent Cr, however, the corrosion rates were higher than those in pure O_2. It was revealed that elemental Cr was concentrated in the scale around the metal/scale interface. Therefor, such higher oxidation resistance for the Fe-Cr alloys was due to the formation of Cr_2O_3 film at the metal/scale interface.

在大气中，通过热重仪器在包括HCI的大气中检查了各种金属的高温腐蚀行为。对于纯Fe，包括HCI在内的大气中的700 c腐蚀速率高于纯O_2中的腐蚀速率。然而，尽管形成了挥发性FECL_2，但在包括HCI的大气中，腐蚀速率高于900 c。这些现象是由于纯Cr的氧化和氯化的模拟进展。在包括hCI的大气中，在温度区域从750℃至850 c的温度区域中，CR_2O_3的形成大大加速。这些被认为归因于以下事实：Crcl_2 Playd的形成在腐蚀行为中起着重要作用。对于纯净的Ni，由于温度从700 c至1000 c c在包括HCl在内的大气中，腐蚀导致标本的质量减少。测试后，在样品上观察到薄的Nio尺度Layr。 1％HCl气氛中的腐蚀速率高于纯O_2。这些表明，包括HCI在内的大气中的腐蚀归因于Ni.Fe-Cr合金的氧化和氯化，随着CR含量的增加，HCl大气的腐蚀速率降低了1％。但是，对于包含数％Cr的合金，腐蚀速率高于纯O_2中的腐蚀速率。据显示，元素CR集中在金属/比例界面周围的尺度上。因此，Fe-Cr合金的氧化耐药性如此较高，是由于在金属/比例接口处形成CR_2O_3膜。