摘要
研究了(Al,Mn)3Ti-2V和TiAl在900℃的(Na,K)_2SO_4以及850℃的Na_2SO_4+NaCl熔盐中的热腐蚀行为。结果表明,(Al,Mn)_3Ti～2V在(Na,K)_2SO_4中的耐蚀性很好,腐蚀产物膜很薄,外层是保护性的Al_2O_3,内层是Al_2O_3+TiO_2+TiS的混合膜。当熔盐中存在NaCl时,(Al,Mn)_3Ti-2V的耐蚀性极差,腐蚀产物的厚度比在(Na,K)_2SO_4中大100多倍,且具有分层结构,最外层富MnO(含少量Al+2O_3和TiO_2),第二层为Al_2O_3+少量TiS,第三层为TiO_2+TiS,由于不能形成保护性的Al_2O_3层,腐蚀产物极易剥落。
Hot corrosion behaviors of (Al, Mn)3Ti-2V and TiAl in (Na, K)2SO4 melt at 900℃ and in Na2SO4+NaCl melt at 850℃ were studied respectively. The cross-sectional morphologies and profiles of elements in the scale formed on (Al, Mn)3Ti-2V show that (Al, Mn)3Ti-2V has excellent hot corrosion resistance in (Na, K)2SO4 melt. The thin scale consists of an outer protective Al2O23 layer and an inner mixture layer of Al2O3, TiO2 and TiS. When NaCl was added in the Na2SO4 salts, however, the hot corrosion resistance of the (Al, Mn)3Ti-2V becomes very poor. The scale is thicker than that in the absence of NaCl by one hundred times of magnitude at least. The scale consists of three layers: an outer layer consisting of porous MnO plus a little Al2O3+TiO2, a middle layer of porous Al2O3 plus trace amount of TiS, and an inner layer of TiO2+TiS.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第2期185-190,共6页
Acta Metallurgica Sinica
基金
中国国家重点基础研究发展规划G19990650
日本学术振兴会资助项目
