Accession Number : AD0011936

Title :   A RESEARCH INVESTIGATION OF POSSIBILITIES FOR OBTAINING HOT-HARD ELECTRODEPOSITED CHROMIUM OR CHROMIUM-BASE ALLOYS FOR CANNON

Descriptive Note : Interim technical rept.,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OHIO

Personal Author(s) : BRIDE,J. EDWIN ; SCANLON,GEORGE M.

Report Date : 15 JAN 1952

Pagination or Media Count : 31

Abstract : A Cr-Fe alloy was successfully electroplated on a 4-ft steel tube simulating the rifled 40-mm smooth-bore gun tube. A 750 deg F heat treatment improved the bond between the alloy deposit and the steel bore surface, but the degree of adhension was not entirely satisfactorily. Cr-Fe alloy plating baths from commercially available trivalent Cr salts reduced the bath cost appreciably. The composition of deposits from a 2.5% Fe bath was not greatly affected by changes in agitation or oxidation of the bath. Saccharin and h3BO3 lowered the cathode current efficiency when added to sulfate baths to increase the leveling power and refine the gran of the plate. Firing tests indicated unsatisfactory adhension of the alloy plate to 3 erosion-gage weapon inserts.

Descriptors :   ALLOYS, BATHS, BORES, CATHODES, CHROMIUM ALLOYS, COSTS, DEPOSITS, EFFICIENCY, ELECTRIC CURRENT, FIRING TESTS(ORDNANCE), IRON ALLOYS, LEVELING, OXIDATION, PLATING, POWER, STEEL, SUGARS, SULFATES, SURFACES, SYNTHETIC MATERIALS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE