【摘要】 迄今超合金的γ′相分析都是在含氧阴离子电解液中在过钝化区完成的.γ′相分析的基础是γ′相与γ基体两相间过钝化行为的差异,而这种差异是两相间铬含量的不同造成的.因此,无铬超合金中的γ′相在传统电解液中非常难于提取.本文提出一种新方法——在10%NH₄Cl+2%柠檬酸水溶液中在活化电位区的恒电流电解法可以用作这种无铬合金γ′相的定量提取.更多还原

【Abstract】 Up to now γ’ phase in superalloys is always analyzed in electrolytes with oxygen-bearing anionin transpassive dissolution potential range. It is based on the difference of transpassive behavior betweenγ’ phase and γ matrix, which is caused from the difference of chromium contents between toth phases.So the electrolytic extraction of γ’ phase from chromium-free superalloys by traditional methods is verydifficult. In this paper, a new galvanostatic electrolysis method is developed succesefully for the quantitative extraction of Y’ phase from the 10% NH4Cl + 2% citric acid solution in active dissolution range[ about - 200 mV( SCE) ].更多还原