| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of producing a highly corrosion resistant iron material which has high rust preventability without using and containing harmful chromium based compounds. SOLUTION: A rust preventive coating composition containing (a) a compound having a phenolic hydroxy group and (b) at least one or more kinds of compounds selected from the group of silicates and the salts of silicic acid and having a siloxane bond and/or their condensations as essential components is applied to the surface of an iron material whose surface is coated with an undercoating agent essentially consisting of at least one kind of metal selected from zinc and aluminum, and hardening is caused by room temperature treatment or heating treatment, so that a corrosion resistant iron material is produced. COPYRIGHT: (C)2004,JPO
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