Effects of Amount of Cathodic Film on Appearance of Steel Treated in Dilute Chromic Acid Solution:Studies on Appearance of Steel Treated in Dilute Chromic Acid Solution (Part 2)
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概要
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Samples of low carbon steel sheets containing various amounts of metallic chromium and hydrated chromium oxide were prepared by cathodic treatment in a dilute chromic acid solution. The samples obtained were then baked and coated with a clear lacquer. The examinations were made for the effects of amounts of metallic chromium and chromium oxide on reflectivity, lightness, and chromaticity of the cathodic-treated sheets, baked sheets, and lacquered sheets. The results were summarizedas follows: The metallic chromium had no effects on the reflectivity of cathodic-treated sheets. However, it had effects on the lightness of cathodic-treated sheets in the range of not higer than 0.3-0.4mg/dm2 of chromium oxide. The reflectivity of cathodic-treated sheets decreased with the increase of chromium oxide in the cathodic film; however, it remained unchanged when the amount increased to 0.5mg/dm2 or higher. The lacquered sheets showed a constant value of reflectivity regardless of the amount of chromium oxide. The lightness of cathodic-treated sheets decreased with the increase of chromium oxide however, it remained unchanged when the amount increased to 0.4-0.5mg/dm2 or higher. The lacquered sheets showed a constant value of lightness regardless of the amount of chromium oxide; however, in the lacquered sheets of high lightness, their values of lightness depended on the amount of chromium oxide. The surface chromaticity of cathodic-treated sheets showed "a" values of -0.6-+0.7 and "b" values of -0.5- -0.6, which indicated that the hue was pale blue with low saturation. The above values of "a" and "b" were obtained at the chromium oxide amounts of not higher than 0.2-0.25mg/dm2 showing bluish luster undiscernible with naked eyes. The hue of lacquered sheets slightly shifted to the yellow-green zone and remained constant regardless of the amount of chromium oxide. After the cathodic-treated sheets were baked at 210°C for 20min., their bluish hue slightly faded.
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