| abstract |
Lubricating agents (B) and waxes (C) selected from water-soluble inorganic salts (A), molybdenum disulfides and graphite, wherein these components are dissolved or dispersed in water and are solids of (B) / (A) An aqueous lubricant for plastic working of a metallic material, wherein the concentration ratio (weight ratio) is in the range of 1.0 to 5.0 and (C) / (A) is in the range of 0.1 to 1.0. A method of treating a lubricant coating on a metal material, comprising applying an aqueous lubricant to form a lubricant coating on the metal material with a dry weight of 0.5 to 40 g / m 2 . The water-soluble inorganic salt (A) is preferably selected from the group consisting of sulfate, silicate, borate, molybdate and tungstate. Preferably the wax (C) is a natural wax or synthetic wax dispersed in water and having a melting point of 70 to 150 ° C. The present aqueous lubricant can be used to easily impart excellent lubricity to the metal surface on which the chemical conversion treatment film is not formed. |