Water-soluble lubricating agent for plastic working, metal material for plastic working, and worked metal article

Abstract

Provided is a water-soluble rubricating agent for plastic working being capable of forming a lubricating film having lubricity and seizure resistance equal to or greater than a phosphorus-containing chemical conversion treatment film, having excellent corrosion resistance, and also having good film adhesion, without including phosphorus in the film. This water-soluble non-phosphorus lubricating agent for plastic working includes an inorganic solid lubricant as component A, a wax as component B, and a water-soluble inorganic metal salt as component C, wherein the mass ratio (component A/component B) of solid content for component A to solid content for component B is 0.1 to 5, and the mass percentage (component C/(component A+component B+component C)) of solid content for component C to total solid content for components A, B and C is 1 to 30%.

1 . A water-soluble non-phosphorus lubricating agent for plastic working, comprising:
 an inorganic solid lubricant as component A;   a wax as component B; and   a water-soluble inorganic metal salt as component C;   wherein mass ratio (component A/component B) of solid content for component A to solid content for component B is 0.1 to 5, and   mass percentage (component C/(component A+compound B+component C)) of solid content for component C to total solid content for components A, B, and C is 1% to 30%.   
     
     
         2 . The water-soluble non-phosphorus lubricating agent for plastic working according to  claim 1 , wherein the inorganic solid lubricant is at least one selected from the group consisting of calcium compounds, magnesium compounds, barium compounds, zinc compounds, boron compounds (in which, however, borates are not included), and silicate compounds. 
     
     
         3 . The water-soluble non-phosphorus lubricating agent for plastic working according to  claim 1 , wherein the water-soluble inorganic metal salt is at least one selected from the group consisting of borates, molybdates, and tungstates. 
     
     
         4 . The water-soluble non-phosphorus lubricating agent for plastic working according to any of  claims 1  to  3 , wherein mass ratio (component B/component C) of solid content for the component B to solid content for the component C is higher than 1.5. 
     
     
         5 . A metal material for plastic working, comprising a lubricating film on the surface thereof, wherein:
 the lubricating film comprises an inorganic solid lubricant as component A, an organic wax as component B, and a water-soluble inorganic metal salt as component C;   mass ratio (component A/component B) of solid content for component A to solid content for component B is 0.1 to 5; and   mass percentage (component C/(component A+component B+component C)) of solid content for component C to total solid content for components A, B, and C is 1% to 30%.   
     
     
         6 . A worked metal article obtained by plastic working of the metal material for plastic working as set forth in  claim 5 .