Graphites have been considered as the promising materials for the bipolar plates of proton exchange membrane fuel cells. However, the main obstacle is the carbon corrosion under high potential. Applying corrosion resistant and electrically conductive coatings is an effective method to overcome this problem. In this paper, a chromium carbide coating was prepared on the graphite surface by the disproportionation reaction of Cr²⁺ in molten NaCl-KCl-Cr-CrF₃. The effects of molten salt temperature, Cr/CrF₃ ratio, and disproportionation reaction time on the formation of the chromium carbide coating were analyzed. Furthermore, the corrosion behavior of the coating was also studied. For graphite, chromium carbide coating can be prepared in NaCl-KCl-Cr-CrF₃ system at a relatively low reaction temperature. With the increase of reaction temperature, the coverage rate of chromium carbide coating with the same reaction time is higher, the increase of Cr/CrF₃ ratio or the extension of holding time will make chromium carbide into a higher form of Cr/C ratio, and the growth speed of chromium carbide coating gradually decreases with the extension of holding time. The corroison resistance of graphite in 0.1 M H₂SO₄ + 5 ppm HF solution is increased due to the formation of chromium carbde coating on the surface.

石墨被认为是用于质子交换膜燃料电池双极板的有前途的材料。然而，主要障碍是高电位下的碳腐蚀。应用耐腐蚀和导电涂层是克服这个问题的有效方法。本文通过Cr ²⁺在熔融NaCl-KCl-Cr-CrF ₃中的歧化反应在石墨表面制备了碳化铬涂层。分析了熔盐温度、Cr/CrF ₃比和歧化反应时间对碳化铬涂层形成的影响。此外，还研究了涂层的腐蚀行为。对于石墨，可以在NaCl-KCl-Cr-CrF中制备碳化铬涂层₃体系在较低的反应温度下。随着反应温度的升高，相同反应时间的碳化铬涂层的覆盖率更高，增加Cr/CrF ₃比或延长保温时间会使碳化铬转变为更高形式的Cr/C比，并且随着保温时间的延长，碳化铬涂层的生长速度逐渐降低。石墨在0.1 MH ₂ SO ₄  + 5 ppm HF溶液中的耐腐蚀性能因表面形成碳化铬涂层而提高。