Furthermore are the beautiful and overelaborate decorations on the bronze

 From the chemical point of view, black oxide film and black and rust with a substance, belong to the Fe3O4 (iron oxide), and different oxidation of the former is relatively light, the latter is a serious corrosion and oxidation, zoom in to watch the metal surface depression point of the corrosion pit. As to not continue to corrosion and oxidation of metal deep, does not depend on the metal surface of the oxide layer, but depend on external factors outside of the metal. The deepest impression to the bronze is their dignified and graceful exterior style made of straight lines and curves. Such as collectors and maintenance awareness, methods, and the sword which the environment and so on. Bronze oxidation corrosion maintenance can only delay corrosion and can not prevent corrosion. Why our ancient bronzes survive in the world and a small number, while substantial in-kind bronze, which is of bronze and iron chemical elements depends.
Bronze is an alloy of copper Jiaxi Jia lead, copper chloride corrosion is divided into "harmful rust (green powder-like composition for alkalization developed to make objects ulceration or perforation, and even total collapse)" and harm rust film such as copper carbonate, tin oxide, (containing the copper salt of the composition, dyed green, and blue-green, forming a protective layer in the surface of the bronze, so that it no longer continue to suffer corrosion) precisely, the "harmless rust only preserved the historic bronze. For example, the ding and gu (winebronze) typically represents the mixed, modest and masculine.  Bronzes produced by corrosion only two kinds of Fe2O3 (ferric oxide) and Fe3O4 (iron oxide), these two chemicals will not play to prevent the bronze corrosion, the iron in the corrosion process is uninterrupted continuous until the total collapse.
Sword the best preserved in a dry state do not feed moisture, and then a more smooth surface more resistant to corrosion, because the smooth surface can reduce the residual water vapor (moisture) in swords surface, thereby reducing corrosion. There is regular maintenance to their own collections. (Modern science tells us: completely cut off from oxygen conditions, even in neutral or slightly acidic water, iron and steel will not rust. Furthermore are the beautiful and overelaborate decorations on the bronze. Classification of the country except the bronze, performance characteristics and application selection.