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Erosion-Corrosion / FAC Mapping and in Situ Observation of Oxide Film Formation

侵蚀腐蚀/FAC 绘图和氧化膜形成的原位观察

基本信息

批准号：
23560868
负责人：
ISOMOTO YOSHINORI
金额：
$ 3.58万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2011
资助国家：
日本
起止时间：
2011 至 2013
项目状态：
已结题

项目摘要

Effects of flow and environmental conditions on corrosion loss, and visualization of growth behaviors of oxide film growth formed on specimen surfaces were investigated in order to clarify mechanisms of erosion-corrosion or FAC (Flow Accelerated Corrosion) of carbon steel in boiler water environments. As results, it is found that the generation or formation field of erosion-corrosion/ FAC is strongly affected by flow and environmental conditions in the corrosive environments for carbon steel. It is also found that the oxide films gradually grow with testing time in visualization tests and that the flow conditions exist, in which the oxide films are covered on the whole steel surfaces, or parts of steel surfaces are clearly exposed on the surfaces from initial testing time. The generation of erosion-corrosion/FAC was supposed to be depending on the properties of oxide film such as porosity, compaction and crystallization.

为了阐明碳钢在锅炉水环境中的冲刷腐蚀或流动加速腐蚀(FAC)机理，研究了流动和环境条件对腐蚀损失的影响以及在试件表面形成氧化膜生长行为的可视化。结果表明，在碳钢的腐蚀环境中，流动条件和环境条件对冲刷腐蚀/FAC的产生或形成有很大影响。在可视化试验中还发现，随着试验时间的延长，氧化膜逐渐长大，从最初的试验时间开始，存在氧化膜覆盖在整个钢材表面或部分钢材表面明显暴露的流动条件。认为冲刷腐蚀/FAC的产生与氧化膜的气孔率、致密性、晶化等特性有关。