| 摘要 |
<p>A non-chrome anti-rust agent having equivalent or superior performance to chrome-type anti-rust agents, and in particular suitable for treating zinc-plated steel sheet, unplated steel sheet, is provided. After applying a modiufied epoxy resin comprising a copolymer shown by the following structural units (1) and (2), water-dispersed silica and ammonium phospate to a steel sheet, the sheet is heated and dried. <CHEM> (where R1, R2 are substitutable alkyl groups comprising methyl, ethyl, propyl, butyl, t-butyl, and pentyl from 1 to 5 carbon atoms, or substitutable alkenol groups comprising methanol, ethanol, propanol, isopropanol, butanol, and pentanol from 1 to 5 carbon atoms). <CHEM> (where R3, R4 are substitutable alkyl groups comprising methyl, ethyl, propyl, butyl, t-butyl, and pentyl from 1 to 5 carbon atoms, or substitutable alkanol groups comprising methanol, ethanol, propanol, isopropanol, butanol, and pentanol from 1 to 5 carbon atoms).</p> |
