三种M_3Al型金属间化合物的低温热腐蚀  

HOT CORROSION OF THREE M_3Al-TYPE INTERMETALLICS AT 600℃

作　　者：牛焱[1] 吴维(山文)[2] GESMUNDO F VIANI F 

机构地区：[1]中国科学院金属腐蚀与防护研究所,助理研究员沈阳110015 [2]中国科学院金属腐蚀与防护研究所腐蚀科学开放实验室 [3]意大利Genova大学工学院化学研究所

出　　处：《金属学报》1993年第4期B164-B168,共5页Acta Metallurgica Sinica

摘　　要：Na_2SO_4沉积物显著地加速Fe_3Al、Ni_3Al和Ti_3Al在600℃模拟燃气气氛中的腐蚀.腐蚀产物为M与Al的氧化物和硫化物的混合物.Na_2SO_4 deposits accelerate significantly the corrosion rates of 3 intermetallicsFe_3Al, Ni_3Al and Ti_3Al in the simulated combustion gases at 600℃. The corrosion product ismixture of oxides and sulphides of both the base metal and Al. Corrosion resistance of Fe_3Aland Ti_3Al is superior to that of Ni_3Al owing to the formation of an inner layer rich inAl_2O_3 for Fe_3Al and of an intermediate layer composed of TiO_2 and NbO_2 for Ti_3Al modi-fied by Nb. While, Ni_3Al forms an inner layer which is so abundant in Ni sulphide as to facili-tate the migration of Ni outward. The addition of NaCl to Na_2SO_4 has no significant influ-ence on the corrosion behaviour of the three intermetallics.

关 键 词：热腐蚀 铝化物 M3Al 金属互化物 

分 类 号：TG132.32[一般工业技术—材料科学与工程]