| 摘要 |
PURPOSE: To enhance the adhesive strength without causing discoloration by etching a degreased adhesive Al material to remove Mg on the surface and then theramlly treating the material with an aq. silicate soln. of specified concn. to form a specified silicon-contg. oxide film. CONSTITUTION: The surface of the adhesive Al and Al alloy is degreased with a solvent such as trichloroethane, and then the Al material is etches with an aq. soln. of alkaline detergent, etc., to reduce the amt. of Mg detected on the material surface to <10 atomic % or preferably to <5%. The etching is preferably carried out at the dissolving rate of >=2.5μm/min and at the dissolution amt. of >=5g/m<2> . The material is then thermally treated at >=50 deg.C with an aq. soln. contg. 10-1000ppm silicates in total to form an oxide film contg. Si at 1-20mg/m<2> on the surface. The discoloration of the Al material is prevented by this inert and stabilized silicon-contg. oxide film, and the adhesive strength is enhanced.
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