High temperature corrosion induced by multiple secondary oxidants

耐热铬形成合金在温度高达950°C的清洁、干燥的空气中成功钝化，但这种性能会因二次氧化剂(碳、硫、氯、水蒸气)而退化，导致重要工业中的腐蚀失效。该项目旨在研究这些二次氧化剂对铬形成合金腐蚀行为的影响，确定氧化膜中多种氧化剂之间的相互作用，建立外来物种对氧化膜的渗透机理，并对不同合金类型的氧化膜进行评估。研究结果将为发电行业关键的耐热铬成形合金的改进设计/选择提供依据。

Heat resisting chromia-forming alloys passivate successfully in clean, dry air at temperatures up to about 950°C. However, this performance is degraded by secondary oxidants (carbon, sulphur, chlorine, water vapour), leading to corrosion failure in important industries. The project aims to investigate the effect of these secondary oxidants on corrosion behaviour of chromia-forming alloys, to identify interactions between multiple oxidants within the scale, to establish the mechanisms of oxide scale penetration by foreign species, and to evaluate scales on different alloy types. The results will provide a basis for improved design/selection of heat resisting chromia-forming alloys, key to power generation industries.