Accession Number : ADA307250
Title : Get the Lead Out.
Descriptive Note : Final rept.,
Corporate Author : NAVAL SURFACE WARFARE CENTER INDIAN HEAD DIV MD
Personal Author(s) : Peters, Susan T.
PDF Url : ADA307250
Report Date : 29 FEB 1996
Pagination or Media Count : 36
Abstract : In the interests of environmental responsibility, the Navy is seeking replacements for lead decoppering agents. These agents are necessary to remove the copper deposited on the barrel surface of a gun firing copper-banded projectiles. A brief review of the theory of decoppering will be presented to provide the rationale for our choice of bismuth as the replacement for lead. Our test program was being conducted in the 5"/54 gun because the problem of lead toxicity poses two problems in this system: not only the environmental discharge during firings, but the propellant, Naco, contains a lead salt, rather than using lead foil. Protection of the workers manufacturing Naco from the lead salt incurs significant additional expense. Naco was made without lead, fired in a pair of barrels in an attempt to copper the barrels. Though 156 rounds were fired from each barrel, neither showed any measurable coppering. One barrel did show moderate amounts of copper in bore-search examination. After a single round of either a charge loaded with 5 g of bismuth/tin foil or the standard Naco, the barrels were completely cleaned of copper.
Descriptors : *REPLACEMENT, *LEAD COMPOUNDS, ENVIRONMENTS, MANUFACTURING, TOXICITY, COSTS, COPPER, TIN, FOILS(MATERIALS), SALTS, HOMING, BISMUTH, BARRELS.
Subject Categories : Inorganic Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE