A Research Investigation of Possibilities for Obtaining Hot-Hard Electrodeposited Chromium or Chromium-Base Alloys for Cannon
WATERTOWN ARSENAL LABS MA
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Experiments were continued on the application of 94 chromium, 6 iron alloy plate to the bore surfaces of cannon. After moving-anode tests were unsuccessful, a satisfactory technique was developed using full-length anodes in the bore of 4-foot-long sections of 40-mm gun tubes. Plates were then produced with good appearance, good plating efficiency, and adequate dimensional control, but the adhesion to the base metal was not good enough for gun-type service. Several erosion-gage weapon inserts were plated and test fired. Each test resulted in failure by separation of the plate from the bore surface. Some improvement in adhesion was achieved by a thin chromium plate between the steel base and the chromium-iron alloy plate. A bonding heat treatment also effected some improvement. However, erosion-gage weapon-firing tests showed that adhesion was still not sufficient to withstand the conditions encountered in gun tube service.
- Fabrication Metallurgy