应用钾盐盐浴在＜８５０℃下进行液体渗硼，表明该盐浴在如此低温下流动性好，渗速快，对Ｌ／Ｄ＞４０的深孔工件渗硼，内腔可获得均匀的渗硼层。渗层硬度适当，耐磨性好。扫描电镜与Ｘ衍射仪分析表明，低温渗硼，在一定时间范围内不会出现出现ＦｅＢ相，从而保证了渗硼层的韧性。本文对其机理进行了研究，并从数学上加以推导。 Application of potassium salt bath at <850 ℃ under liquid boronization, indicating that the salt bath in such a low temperature fluidity, fast osmosis, the L / D> 40 deep hole workpiece boronizing, lumen can be obtained uniform Boronizing layer. Layer hardness appropriate, good wear resistance. Scanning electron microscopy and X-ray diffractometer analysis showed that boronizing at a low temperature does not appear FeB phase within a certain time range, thus ensuring the toughness of boronized layer. In this paper, the mechanism is studied and deduced from mathematics.