Because of the toxicity of hexavelant chromium ion, treatments of metallic surface with chromate compounds to retard corrosion are undesirable for safety control in industrial uses and protection of environment. In this study, we investigated several compounds such as inorganic, organic, and polymer materials in order to substitute the chromate conversion treatment on steel sheet. The corrosion property was investigated in a salt spray tester with 3.5 wt.% NaCl at 35℃. The results showed that the zirconium/silane/polymer triple coatings on the galvanized steel exhibited a significant retardation of corrosion. Although the multicoating system needs a complexed processing, we can confirm a possibility of development of a chromate-free chemical conversion treatment for galvanized steel sheet.

• 전상익(부경대학교 응용화학공학부) | Sangik Jeon
• 박찬영(부경대학교 응용화학공학부) | Chan-Young Park
• 류진호(POSCO 기술연구소) | Jin-Ho Ryou
• 이원기(부경대학교 응용화학공학부) | Won-Ki Lee Corresponding Author