Aqueous lubricant, metal material, and metal processed articles

Abstract

An aqueous lubricant for metal material plastic working, which can form a lubricating coating having excellent lubricity (moisture absorption resistance) under a high humidity environment, seizure resistance to metal working with high difficulty, and the like, and further has excellent long-term agent stability; a metal material having a lubricating coating formed by the aqueous lubricant on/over a surface of the metal material; and a metal processed article obtained by molding the metal material are provided. The above problem can be solved by using an aqueous lubricant for metal material plastic working in which an aliphatic polycarboxylic acid having 5 to 8 carbon atoms and a solubility in water at 20° C. of 10 g/100 mL or more and an alkaline earth metal compound are blended in water, or an alkaline earth metal salt of the aliphatic polycarboxylic acid is dissolved or dispersed in water.

1 . An aqueous lubricant for metal material plastic working, wherein an aliphatic polycarboxylic acid having 5 to 8 carbon atoms and a solubility in water at 20° C. of 10 g/100 mL or more and an alkaline earth metal compound are blended in water, or an alkaline earth metal salt of the aliphatic polycarboxylic acid is dissolved and/or dispersed in water. 
     
     
         2 . The aqueous lubricant according to  claim 1 , which further contains at least one kind of organic lubricants selected from an oil, a soap, a wax, an amino acid compound having a layered structure, an organic modified clay mineral, and an extreme-pressure agent. 
     
     
         3 . The aqueous lubricant according to  claim 1 , which contains, as a binder component, at least one kind selected from a water-soluble inorganic acid salt, a water-soluble organic acid salt, and a water-dispersible or water-soluble resin. 
     
     
         4 . The aqueous lubricant according to  claim 1 , which further contains at least one kind of solid lubricants selected from zinc phosphate, zinc oxide, titanium dioxide, mica, molybdenum disulfide, tungsten disulfide, tin disulfide, graphite fluoride, graphite, boron nitride, calcium hydroxide, calcium carbonate, lime, calcium sulfate, and barium sulfate. 
     
     
         5 . The aqueous lubricant according to  claim 1 , wherein the aliphatic polycarboxylic acid is citric acid. 
     
     
         6 . A metal material, having
 a lubricating coating formed by the aqueous lubricant according to  claim 1  on/over a surface of the metal material.   
     
     
         7 . A metal processed article, obtained by molding the metal material according to  claim 6 . 
     
     
         8 . The aqueous lubricant according to  claim 2 , which contains, as a binder component, at least one kind selected from a water-soluble inorganic acid salt, a water-soluble organic acid salt, and a water-dispersible or water-soluble resin. 
     
     
         9 . The aqueous lubricant according to  claim 2 , which further contains at least one kind of solid lubricants selected from zinc phosphate, zinc oxide, titanium dioxide, mica, molybdenum disulfide, tungsten disulfide, tin disulfide, graphite fluoride, graphite, boron nitride, calcium hydroxide, calcium carbonate, lime, calcium sulfate, and barium sulfate. 
     
     
         10 . The aqueous lubricant according to  claim 3 , which further contains at least one kind of solid lubricants selected from zinc phosphate, zinc oxide, titanium dioxide, mica, molybdenum disulfide, tungsten disulfide, tin disulfide, graphite fluoride, graphite, boron nitride, calcium hydroxide, calcium carbonate, lime, calcium sulfate, and barium sulfate. 
     
     
         11 . The aqueous lubricant according to  claim 8 , which further contains at least one kind of solid lubricants selected from zinc phosphate, zinc oxide, titanium dioxide, mica, molybdenum disulfide, tungsten disulfide, tin disulfide, graphite fluoride, graphite, boron nitride, calcium hydroxide, calcium carbonate, lime, calcium sulfate, and barium sulfate. 
     
     
         12 . The aqueous lubricant according to  claim 2 , wherein the aliphatic polycarboxylic acid is citric acid. 
     
     
         13 . The aqueous lubricant according to  claim 3 , wherein the aliphatic polycarboxylic acid is citric acid. 
     
     
         14 . The aqueous lubricant according to  claim 4 , wherein the aliphatic polycarboxylic acid is citric acid. 
     
     
         15 . The aqueous lubricant according to  claim 8 , wherein the aliphatic polycarboxylic acid is citric acid. 
     
     
         16 . The aqueous lubricant according to  claim 9 , wherein the aliphatic polycarboxylic acid is citric acid. 
     
     
         17 . The aqueous lubricant according to  claim 10 , wherein the aliphatic polycarboxylic acid is citric acid. 
     
     
         18 . The aqueous lubricant according to  claim 11 , wherein the aliphatic polycarboxylic acid is citric acid.