Evaluation of Principal Factors for Obtaining Ductile Hot-Hard Chromium Electroplate for Cannon

Results of experiments are reported dealing with physical characteristics of chromium electroplate and with new electrolytes for the electrodeposition of chromium, The new electrolytes falling the three classes fused salt baths, aqueous baths, and organic type baths. The new information serves as the basis for discussion of the possibilities for producing a hot-hard electrocoating for cannon. Experimental data show that nitriding or boronizing of chromium plate is not a practicable method for counteracting the softening normally occurring when the plate is heated above the recrystallization temperature. A considerable amount of work with electrolytes has not indicated a method for producing ductile chromium plate. The best possibilities for a hot- hard and ductile electroplate appear to lie in the alloy plating field.