Why the bronze sculpture is Green?

In the left handed down for thousands of years and unearthed bronzes, some because of the external environment and its structure defects. Varying degrees of corrosion has happened to the left over or unearthed bronze sculpture. For these types of long-term corrosion of bronze preservation continues, the key is in-depth analysis of the damage factor, to take appropriate protective measures, as soon as possible to repair damaged objects. Some of the bronze sculpture even fall to pieces.

First is the characteristics of the corrosion of bronze sculpture. Generally refers to the copper-tin alloy bronze, are also part of copper, tin, lead alloy. Bronze hardness, low melting point, easy casting, good corrosion resistance, not only practical but also long-term preservation. The composition of a bronze sculpture is different from each other. And their environment is different from the reasons and the corrosion product is not the same. Bronze harmful rust corrosion mechanism quite complex, for example, buried in the ground year-round bronze, exposed to the gas and the corresponding salts, moisture, chemical reaction and electrochemical reaction, and gradually build rust corrosion.

Bronze and cuprous oxide oxygen exposure, which in turn generates copper oxide, some bronzes buried before the surface has a layer of copper oxide. Some of the chinese bronze sculpture in the ground due to exposure to dissolved carbon dioxide will form a basic copper carbonate or azurite.

If the bronze sculpture contains a high ratio of tin, the tin was in turn transformed into a smooth gray-green rust. However, copper oxide and underground salt, acid, water, oxygen exposure and can be converted into alkaline copper chloride, which loose the expansion of the powdery rust, still immersed in the water of oxygen and promote the bronze corrosion products continues to expand and depth, until the bronze ulceration, perforation, are cultural circles as bronze disease.

The surface of china bronze sculpture seems to be in bright green with powdered rust. It is not, tick gently with a tool to open powdery rust, and immediately see the rust under the green, then red and brown rust is down, continue down or green rust layer, the innermost layer of the white waxy cuprous chloride, which can sometimes wear a bronze wall loss. You would better keep the bronze sculpture away from the moist environment. If you dig the cuprous chloride, contact with water and oxygen in the air, will continue to corrosion bronze, and bronze will be infected with the surrounding, leaving the rapid spread of bronze destroyed.

Bronze base by land and physical analysis of corrosion products. they will recognize the significant historical value and artistic achievements of ancient Chinese bronze sculpture. corrosion products that we have a real clear conclusions, such as from sensory commonly referred Zaokang rust, after a sample analysis showed that the composition of alkaline copper chloride or cuprous chloride, commonly known as rust or powdery rust harmful.

Through the analysis of the corrosion of bronze sculpture, we will be able to know how to preserve them. Bronze corrosion protection is based on the reasons leading to its deterioration and corrosion mechanism of bronze corrosion. It can be seen that the preservation of china bronze sculpture has a close relationship with the environment. Bronze for the protection of the general treatment, is the cuprous chloride mechanical and physical, chemical removal.

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