| 摘要 |
<p>A rust removing and metal surface protecting composition, which comprises about 99.5% by weight of phosphoric acid at 85% concentration, from 0.11 to 0.14% by weight of 1,3-dibutyl thiourea, from 0.09 to 0.11% by weight of 1,3-diethyl thiourea, about 0.025% by weight of a non-ionic surface active agent, from 0.10 to 0.20% by weight of an organic solvent, and from 0.08 to 0.18% by weight of an amine selected from the group consisting of polyoxyethylene fatty alkyl amines containing 2 to 15 moles of ethylene oxide, the fatty alkyl group of which being derived from fatty acids having 12 to 18 carbon atoms. The composition is effective in removing rust on metal surfaces and protecting the metal against corrosion with a hard, crystalline phosphate coating. It can be easily applied by dipping, spraying or brushing.</p> |
