| 摘要 |
PURPOSE:To achieve high corrosion resistance and discharge utilization rate of zinc and a zinc alloy without performing any amalgamation by coating the surface of pure zinc with either a combination of silver and a specific corrosion- resistance-improving metal or an alloy consisting of silver and a specific corrosion-resistance-improving metal. CONSTITUTION:Pure zinc is treated with both an aqueous solution of a silver salt and an aqueous solution of salts of at least one metal element chosen from among gallium, indium, lead, bismuth and thallium to coat the surface of the pure zinc with a substitution layer of silver or that of above metal elements including silver. In another method, a zinc alloy containing at least one element chosen from among gallium, indium, lead, bismuth and thallium is treated with an aqueous solution of a silver salt to coat the zinc alloy with a substitution layer of silver. The thus obtained coated zinc or zinc alloy has remarkably increased corrosion resistance and zinc utilization rate during its use as a negative electrode for a primary battery. |
