Highly corrosion-resistant porous metal body and method for producing the same

Abstract

Provided are a porous metal body that is excellent in terms of corrosion resistance and that is suitable for a collector for batteries such as lithium-ion batteries, capacitors, or fuel cells; and methods for producing the porous metal body. A production method includes a step of coating a porous nickel body with an alloy containing at least nickel and tungsten or a metal containing at least tin; and a subsequent step of a heat treatment. Another production method includes a step of forming a nickel-plated layer on a porous base and then continuously forming an alloy-plated layer containing at least nickel and tungsten or tin, a step of removing the porous base, and a step of reducing metal. Such a method can provide a porous metal body in which tungsten or tin is diffused in a porous nickel body or a nickel-plated layer.

1 . A method for producing a porous metal body containing at least nickel and tungsten, the method comprising a step of coating a porous nickel body with an alloy containing at least nickel and tungsten; and a step of subsequently performing a heat treatment to diffuse tungsten into the porous nickel body. 
     
     
         2 . The method for producing a porous metal body according to  claim 1 , wherein the porous nickel body is obtained by coating, with nickel, a porous base having been made electrically conductive, removing the porous base, and subsequently reducing nickel. 
     
     
         3 . The method for producing a porous metal body according to  claim 1 , wherein the heat-treated porous metal body has a nickel content of 60 mass % or more and 95 mass % or less and a tungsten content of 5 mass % or more and 40 mass % or less. 
     
     
         4 . The method for producing a porous metal body according to  claim 1 , wherein the heat-treated porous metal body further contains, as a component, 10 mass % or less of phosphorus. 
     
     
         5 - 19 . (canceled)