摘要
研究了TiAl金属间化合物在熔融盐中的热腐蚀行为。TiAl在900℃(Na,K)_2SO_4中呈现良好的抗热腐蚀行为,形成的腐蚀产物具有分层结构,外层为TiO_2与Al_2O_3的混合氧化物,第二层由致密的Al_2O_3组成,内层是Ti或Al的硫化物。在Na_2SO_4+NaCl的混合盐中,TiAl遭受严重的热腐蚀,不能形成保护性的Al_2O_3层,形成的Al_2O_3和TiO_2混合膜的粘附性差,较易剥落。
Hot corrosion behavior of TiAl intermetallics in (Na,K)2SO4 and in Na2SO4+NaCl melts was investigated respectively. TiAl showed good hot corrosion resistance in (Na,K)2SO4 melts at 900℃ due to the formation of a barrier layer of Al2O3. However, TiAl suffered from severe hot corrosion in Na2SO4+NaCl melts at 850℃, where the protective Al2O3 barrier could not form. The mechanism of hot corrosion of TiAl was briefly discussed.
出处
《中国腐蚀与防护学报》
CAS
CSCD
1997年第3期233-237,共5页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金
国家杰出青年基金资助项目
