| 摘要 |
PROBLEM TO BE SOLVED: To improve the corrosion resistance without using harmful chromate by forming an oxidized film on the surface of a magnesium material or a magnesium alloy material using a neutral or alkaline soln. as a treating soln. by a chemical or an electrochemical method and thereafter executing high pressure vapor treatment. SOLUTION: A magnesium material or a magnesium alloy material molded by a die casting method, an injection forming method or the like is cleaned, if necessary after executing degreasing treatment with an organic soln. or an alkaline degreasing agent and is moreover subjected to etching treatment by using alkali, metallic salts or the like, and, successively, the electric potential of the activated surface is made uniform with a surface conditioner. Then, the magnesium material or the magnesium alloy material with fine pores formed on the surface is treated using a neutral soln. or an alkaline soln. as a treating soln. by a chemical method or an electrochemical method to form an oxidized film on the surface. After that, this oxidied film is treated in a high pressure vapor atmosphere under 1.5 to 10 kgf/cm2 at about 110 to 200 deg.C for about 5 to 60 min.
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