Stabilization Of "Powdery Rust" Of Bronze Ware By Plasma Surface Effect At Low Temperature

Bronze ware is an important part of Chinese civilization,with important historical value,scientific value and high artistic value.Bronze relics buried underground for thousands of years were corroded by water and soluble salt in the soil,and various corrosion products were generated.Most overall corrosion material on bronze relics ontology has certain protective effect,however,in many corrosion product,there is a certain type of corrosion containing chlorine element composition,in certain circumstances,will cause the bronze body as a whole or partial corrosion "powder",and the corrosion will bronze relics around like infectious diseases,infections,This chlorine-containing rust is known as "powdery rust" and is colloquially called "bronze disease" by conservators."Powdery rust" is porous and unstable,which poses a great threat to the display and utilization of bronzes.Therefore,it is of great significance to carry out basic research on the stability of "powdery rust" of bronze ware and develop the stable treatment technology of "powdery rust" for the protection of bronze ware.So far,chemical methods are mostly used to stabilize the powdery rust of bronze ware,but the treatment effect is not obvious.Therefore,the stabilization treatment of powdery rust has always been a key problem in the protection of bronze cultural relics.According to the problems existing in the stabilization process of powdery rust,this paper puts forward the research idea of using low temperature plasma technology to stabilize powdery rust.With the help of low temperature plasma can effectively improve the characteristics of particle chemical reactivity,under different experimental conditions,select low temperature plasma with different gas atmosphere to treat the surface of the object,by changing its physical and chemical structure,so as to achieve the purpose of improving the surface performance of the object.In this paper,two kinds of low-temperature plasma instruments designed by Hefei Institute of Physical Science,Chinese Academy of Sciences were used to carry out the stabilization experiment of low-temperature plasma on basic copper chloride under different atmospheres and different parameters.Argon,ammonia,oxygen,carbon dioxide and nitrogen were selected for the experiment.The morphology and phase of the treated samples were analyzed by means of ultra-depth of field microscope,laser Raman spectrometer and X-ray diffraction analyzer.The results show that the surface structure of "powder rust" experimental blocks treated by ammonia and nitrogen radio frequency plasma becomes more compact,and the hygroscopic property is reduced,which plays a role of water erosion isolation.Through a series of experiments,the gas atmosphere and experimental parameters of low temperature plasma suitable for stable transformation of powdery rust were preliminarily summarized,and the transformation methods and technical routes of low temperature plasma were further explored.In the future,plasma instruments will be further optimized,which can also provide reference for the subsequent wide application of low-temperature plasma in cultural relic protection.