耐硫酸复合介质的铸造不锈钢组织与腐蚀行为的研究

STUDY ON THE MICROSTRUCTURE AND CORROSION BEHAVIOUR OF CAST STAINLESS STEEL RESISTANT TO SULPHURIC ACID MULTI- CORROSIVE MEDIUM BY SCANNING TUNNELING MICROSCOPE (STM)

对含５０％Ｈ２ＳＯ４、１０％ＨＮＯ３，温度８５℃的硫酸复合介质，设计了新型铸造不锈钢的化学成分，研究了此钢种的组织及其腐蚀行为。结果表明，该钢经１１００℃固溶处理后，可以得到单相奥氏体组织，具有良好的耐蚀性能。通过ＳＴＭ观察，得到了超高分辩三维腐蚀图象，为该钢的研制提供了依据。

The chemical conposition of new type cost stainless steel used for the fluid containing 50% H 2SO 4,10%HNO 3 of 85℃ sulphuric acid multicorrosive medium are designed.the microstructure and corrosion behaviour of new type cast stainless steel are investigated. Experimental results show that,the steel has single-phase austenitic structure and better corrosion resistance after solution heat treatment at 1100℃.By STM,We con obtain ultra-high 3-D resolution corrosion images for this new type steel. And these basic work will be helpful for the further application of this steel.