2B4O7、H3BO3、KF或KHF2組成）去除304不銹鋼表面氧化膜，研究了銀釬劑對304不銹鋼表面氧化膜的去除機理。結(jié)果表明，700 ℃時，在釬劑成分中某一成分的單獨作用下，K2B4O7和KF不能去除304不銹鋼表面氧化膜；在任意2種成分的協(xié)同作用下，只有K2B4O7與H3BO3的混合物在700 ℃下不能熔化，其余二元混合物均能與鋼板表面氧化物反應(yīng)；自由能（ΔGmθ）和反應(yīng)平衡常數(shù)（Kθ）的計算結(jié)果顯示，釬劑去除氧化膜的主要原因是該過程中釬劑中的F替代氧化物中的O，該反應(yīng)的平衡常數(shù)達到 1.3×10167，自由能小于零，反應(yīng)可以進行。XRD結(jié)果顯示，在2θ=18°位置的峰形發(fā)生改變，說明KF被KHF2替代后，釬劑去除氧化膜的機理發(fā)生變化。含有KF和KHF2的3號釬劑在540 ℃時可以有效去除鋼板表面氧化膜，與釬劑的反應(yīng)產(chǎn)物具有非晶結(jié)構(gòu)特征。;Silver brazing flux, composed of K2B4O7, H3BO3, KF and/or KHF2, was used to remove the oxide film on the surface of 304 stainless steel. The oxide film removal mechanism was studied. The results show that K2B4O7 and KF cannot remove the oxide film on the surface of 304 stainless steel at 700 °C. Under the synergistic action of any two components, only the mixture of K2B4O7 and H3BO3 cannot melt at 700 °C. The calculation results of the reaction equilibrium constant (Kθ) and Gibbs free energy (△Gmθ) show that the main reason for removing oxide film is that F in the brazing flux can replace O in the oxide in the process. XRD results show that the peak pattern at 2θ=18° is changed, indicating that the mechanism of removing oxide film is different when KF is replaced by KHF2 in silver brazing flux. No. 3 brazing flux with both KF and KHF2 can effectively remove the oxide film on the surface of the 304 stainless steel plate at 540 °C. The reaction product has the characteristics of amorphous structure."/>