摘要
研究了表面涂少量ＭｎＣｌ２ 对Ｔｉ４７Ａｌ２Ｃｒ２Ｎｂ 合金９０００Ｃ 恒温氧化行为的影响。涂少量ＭｎＣｌ２ 后合金的氧化速率降低了５０ ％ 以上，氧化膜也由ＴｉＯ２ 和Ａｌ２Ｏ３ 的混合物变为以Ａｌ２Ｏ３ 为主的氧化物。发生上述变化的原因可能在于氧化开始时合金中钛与Ｃｌ 反应形成钛的亚稳态氯化物挥发掉，合金表面形成一层致密的氧化铝膜，阻碍合金中的Ｔｉ 向外扩散氧化。
The effect of MnCl 2 applied on surface of Ti47Al2Cr2Nb quaternary alloy on its isothermal oxidation behavior at 900 0C has been studied. The presence of MnCl 2 reduced the oxidation rate of the alloy by a factor of 3, and changed the scale composition from a mixture of TiO 2 and Al 2O 3 to basically pure Al 2O 3. The reason for the improvement of oxidation resistance of the alloy due to MnCl 2 was discussed. At the beginning of oxidation titanium in the alloy reacted with Cl to form substable titanium chloride, which vaporized and left alloy surface. As a result, a layer of compact Al 2O 3 scale formed on the alloy surface and prevented the outward diffusion of titanium.
出处
《中国腐蚀与防护学报》
CAS
CSCD
1999年第5期311-314,共4页
Journal of Chinese Society For Corrosion and Protection
