Fe_3Al－Mn合金的电化学腐蚀特性

为考察Ｍｎ对Ｆｅ３Ａｌ金属间化合物耐蚀性能的影响，测定了四种成分的合金在三种介质中的电化学腐蚀特性，并对其微观机理进行了初步分析．结果表明，Ｍｎ的加入对Ｆｅ３Ａｌ基合金在三种介质中的腐蚀类型无显著影响；试验合金在３．５％ＮａＣｌ溶液中以点蚀为主要特征，伴有缝隙腐蚀；在１Ｎ的ＮａＯＨ和０．５Ｎ的Ｈ２ＳＯ４溶液中以均匀腐蚀为主，在０．５Ｎ的Ｈ２ＳＯ４中还伴有点蚀；当Ｍｎ的加入量适当（不致引入新相）时，可使试验合金在３．５％ＮａＣｌ和０．５Ｎ的Ｈ２ＳＯ４溶液中的腐蚀速度显著降低

Behaviour of electrolytics corrosion in Fe 3Al Mn intermetallic alloys

The effect of Mn on the electrolytics corrosion bahavior of Fe 3Al alloys has been studied in 3 5% NaCl,0 5N H 2SO 4 and 1N NaOH aqueous solution .The results have indicated that the main corrosion features of the test alloys are pit corrosion with crevice corrosion in 3 5% NaCl solution;while in 0 5N H 2SO 4 and 1N NaOH solution, the main feature is homogeneous corrosion with a little pit corrosion .When the volume of Mn is appropriate ,the corrosion speed of the test alloys in 3.5% NaCl and 0.5N H 2SO 4 aqueous solution will decrease obviously. The effect of Mn on the corrosion type is not obvious.