Salt bath for the currentless production of wear resistant boride layers

摘要

There is described a salt bath based on an alkali and/or alkaline earth metal halide with which there can be produced without the use of current adherent and wear resistant boride coatings on metallic workpieces. This bath contains gaseous boron monofluoride or a compound from which there is formed intermediately boron monofluoride. Advantageous there is used a salt bath containing 30-60% BaCl2, 10-25% NaCl, 1-20% boron oxide or borate, 10-30% NaF, and 1-15% B4C.