Process for lubrication-treating aluminum or aluminum alloy material

Abstract

A lubrication-treating process for an Al or Al alloy material is carried out by cleaning the material; applying an anodic oxidation to the cleaned material surface to form a 3 to 30 μm thick anode oxidation coating; and forming a lubrication coating including a polyester resin (30 to 70 mass parts), a particulate PTFE (30 to 70 mass parts) and ceramic (alumina) particles (0.5 to 5 mass parts), and 2 to 20 μm thick, to thereby impart excellent resistances to adhesion and seizure, and a low friction, to the Al or Al alloy material at a low cost and with no or a very low pollution of the environment.

1 . A process for lubrication-treating an aluminum or aluminum alloy material, comprising: 
 cleaning a surface of the aluminum or aluminum alloy material;    applying an anodic oxidation treatment to the cleaned surface of the aluminum or aluminum alloy material, to form an anodic oxidation coating layer having a thickness of 3 to 30 μm on the wear-resistant material surface; and    forming a lubrication coating layer comprising a polyester resin, a particulate polytetrafluoroethylene and ceramic particles and having a thickness of 2 to 20 μm on the anodic oxidation coating layer.    
     
     
         2 . The lubrication-treating process for an aluminum or aluminum alloy material as claimed in  claim 1 , wherein the anodic oxidation treatment is carried out in a sulfuric acid bath or an oxalic acid bath, at a treatment temperature of 0 to 30° C. at an current density of 0.5 to 4 A/dm 2 .  
     
     
         3 . The lubrication-treating process for an aluminum or aluminum alloy material as claimed in  claim 1 , wherein the lubrication coating layer is formed by coating a coating liquid comprising a polyester resin, a particulate polytetrafluoroethylene and ceramic particles on the anodic oxidation coating layer, and then baking the coated coating liquid layer at a temperature of 100 to 250° C. for 1 to 20 minutes.  
     
     
         4 . The lubrication-treating process for an aluminum or aluminum alloy material as claimed in  claim 1 , wherein the polyester resin (A), the particulate polytetrafluoroethylene (B) and the ceramic particles (C) in the lubrication coating layer are present in the mass contents in the ranges of (A): 30 to 70 parts, (B): 30 to 70 parts and (C): 0.5 to 5 parts, per 100 parts of the total (A)+(B)+(C).  
     
     
         5 . The lubrication-treating process for an aluminum or aluminum alloy material as claimed in  claim 1 , wherein the ceramic particles are alumina particle having an average particle size of 0.01 to 0.2 μm.  
     
     
         6 . The lubrication-treating process for aluminum or an aluminum alloy material as claimed in  claim 1 , wherein the aluminum or aluminum alloy material is a sliding material.