3BO3、K2B4O7和KF（質(zhì)量比為7:10:3）3種組分配制而成的銀釬劑的去膜機理。結(jié)果表明：在700 ℃時，K2B4O7或KF都不能單獨去除Q235鋼板表面的氧化膜，且KF會加快高溫下鋼表面的氧化速率；H3BO3能夠去除Q235鋼表面的氧化膜，然而其反應(yīng)產(chǎn)物具有明顯的非晶結(jié)構(gòu)特征，并且流動性差。此外在700 ℃時，H3BO3與KF能夠發(fā)生反應(yīng)，其反應(yīng)產(chǎn)物可以去除鋼表面氧化膜。KF和K2B4O7之間也能在700 ℃發(fā)生類似的反應(yīng)，然而其反應(yīng)產(chǎn)物非常堅硬。因此，在700 ℃時，H3BO3、K2B4O7和KF混合釬劑能夠與Q235鋼板表面氧化膜反應(yīng)，且反應(yīng)產(chǎn)物具有明顯的非晶特征。KF的加入將非反應(yīng)性H3BO3-K2B4O7二元體系轉(zhuǎn)化為反應(yīng)性KF-H3BO3-K2B4O7三元體系。在這個三元體系中，KF不但對鋼板沒有腐蝕性，反而促進了氧化膜的去除。;The film removal mechanism of FB3-F silver brazing flux consisting of H3BO3, K2B4O7, and KF with the mass ratio of 7:10:3 was studied. Results show that K2B4O7 or KF cannot individually remove the oxide film on Q235 steel at 700 °C, and KF even accelerates the oxidation rate of steel surface at high temperature. H3BO3 can remove the oxide film at 700 °C, but the product possesses an obvious amorphous structure feature and poor fluidity. Furthermore, H3BO3 can react with KF at 700 °C, and the reaction product can remove the oxide film. Similarly, K2B4O7 can react with KF, but the product is hard. The mixture solder consisting of H3BO3, K2B4O7, and KF can react with the oxide film on surface of Q235 steel plate, and the reaction product presents obvious amorphous feature. The addition of KF transforms the nonreactive H3BO3-K2B4O7 binary system into the reactive KF-H3BO3-K2B4O7 ternary system at 700 °C. KF shows no corrosivity and promotes the removal of oxide film of steel plates in this ternary system."/>