Thiourea compound rust remover and rust removal paste for protecting silverware and gilded silverware

Abstract

The invention provides a thiourea compound rust remover and rust removal paste for protecting silverware and gilded silverware. The rust remover comprises of thiourea 0.9-1.1 mol / l and ferric sulfate of 0.01-0.015 mol / l and has the pH value of 1-2. The rust removal paste is prepared by adding 1.6-1.8 g of gelatin and 9-10 g of diatomite in 10 ml of rust remover with uniformly stirring and has the pH value of 2-3. The rust remover can be used in concert with the rust removal paste for removing black corrosion on the ancient silverware and gilded silverware surfaces with good effect. The rust remover and the rust removal paste accord with the protecting principles of cultural relics, such as no change of original states of cultural relics and minimal intervention, and don't cause physical damage.

Description

technical field [0001] The present invention relates to a rust remover and paste for the protection of ancient silverware and gilt silverware, and in more detail to a thiourea compound rust remover for the protection of ancient silverware and gilt silverware agent and rust remover paste. Background technique [0002] In the practice of cultural relics protection, an experimental study on the surface rust removal of silverware and gilt silverware was carried out: [0003] "Zhang Guangmin, Xiong Yingfei, Zhang Ming. Surface Treatment of Gold Jewelry, Silver and Bronze Buddha Statues Unearthed from the Underground Palace of Xilin Pagoda, Songjiang. Proceedings of the Sixth National Academic Conference on Archeology and Cultural Relics Preservation Chemistry. Quanzhou, Fujian. Published by the Chinese Chemical Society. 2000, 66 -71. "analyzed the rust on the surface of gilt-silver Buddha statues and gilt-silver pagodas from the Song Dynasty to the Ming Dynasty unearthed in the ...

AI Technical Summary

Problems solved by technology

[0011] It can be seen that using citric acid, sodium sesquicarbonate, sodium thiosulfate and ammonia water mixed solution, ethylenediaminetetraacetic acid, nitrilotriacetic acid, thiourea and other materials to derust ancient silverware and gilt silverware is the most important method. Widely used chemical methods, laser technology, ultrasonic scaler and other technologies are widely used physical methods, but none of them can satisfy the requirements of not only not scratching ancient silverware and gold-plated silverware, but also effectively removing scratches. The requirements of silver sulfide, silver chloride, silver oxide and copper rust on its surface, so as to restore its artistic value

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