Electrodeposition of Tantalum and Tantalum-Chromium Alloys

摘要

A part of a program to develop erosion resistant coatings for advanced gun barrels, electrodeposition of tantalum and tantalum-chromium alloys from fused FLINAK (eutectic mixture of LiF-KF-NaF) has been investigated. Tantalum-chromium alloys containing 2-6% chromium were obtained by codepositing tantalum and chromium from an electrolyte containing 10 wt% TaF5(added as K2TaF7) and 0.5-1.5% Cr (added as CrF3), at 800 C and 15-40 ma/sq cm current density. The alloy coatings were smooth and columnar in structure. The microhardness of these coatings increased with the increase of chromium content.