| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for surface treatment of a magnesium material or a magnesium alloy material where chemicals are not used and production efficiency is high. SOLUTION: The surface treatment method comprises: a blast treatment stage where the surface of a magnesium material or a magnesium alloy material is subjected to wet blast treatment; and a steam treatment stage where, after the blast treatment stage, the magnesium material or magnesium alloy material is subjected to heat treatment at a relative humidity of≥80%. By the method, a rust preventive film can be formed on the surface of the magnesium material or magnesium alloy material without using chemicals. Thus the method is made harmless for the environment and the number of stages can be reduced compared with the case of chemical conversion treatment. That is, the treatment similar to the (1) degreasing stage, (2) acid etching stage and (3) desmutting stage of the chemical conversion treatment can be performed by the blast treatment stage. COPYRIGHT: (C)2005,JPO&NCIPI
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