テトラエトキシシランから調製したシリカゾルを被覆した溶融亜鉛めっき鋼板の作製と耐食性評価

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Silica-sol solution was prepared using tetraethoxysilane as a starting material. A silica-gel film was formed on both silica glass substrates and hot-dip galvanized steel plates by single-step dip coating and drying at room temperature. X-ray diffraction (XRD) analysis was performed on the films formed on the silica glasses and the steel plates; it revealed that the film formed on the former consisted of H_2Si_2O_5 and both Zn_2SiO_4 and ZnNO_3(OH)・H_2O were detected in the film on the latter. From these results, it was cleared that the as-prepared silica-sol itself was H_2Si_2O_5, however the silica-sol was changed to Zn_2SiO_4 when coated on the hot-dip galvanized steel plates resulting from a reaction with Zn on the surface of plates. The thickness of tripe-layered film formed by three-times dipping was estimated to be about 1.3μm by direct SEM observation. Using a salt spray test and a stack test, corrosion resistance of the hot-dip galvanized steel plates coated with the silica-sol was examined, in comparison with a chromate-coated and a naked hot-dip galvanized steel plates. The silica-sol coated plates exhibited superior corrosion resistance to both former and latter samples in each test. This might be explained in terms of the formation of Zn_2SiO_4 and ZnNO_3(OH)・H_2O. The coating materials, insoluble in water, can protect the steel plates from corrosive oxygen and electrolyte ions etc.
社団法人日本材料学会の論文
2006-01-15

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