Lead, tin and copper with high purity of copper are cast together according to the needs. Copper rust is a chemical reaction that occurs on the surface of a copper sculpture as the surrounding environment changes. This reaction will undergo a dormant phase and a growth phase. Copper rust
The color is mainly green and blue. Most of the bronze sculptures with short survival time and good preservation have beautiful shells such as "mercury enamel" or "black lacquer ancient".
The old age is rusted, and its rust has obvious gradation. Generally, it is divided into rust joint layer, main body rust layer and ground rust layer from the outside to the inside. Common corrosion on the rust-bonded layer and attachments in the underground environment, such as soil or carbonized vegetation
Chips, etc.; there is a layer of green or blue crystal rust under the rust joint layer is the main body rust layer; below the main body rust layer is the black or red-brown oxide film layer close to the copper engraving , that is, the ground rust layer. The three layers of corrosion are clearly ordered and arranged reasonably.
Some bronze sculptures do not have a rust-bonding layer, or even a main body rust layer, but they must not have no rust layer of the earth. This is crucial for distinguishing old rust and new rust. Most antique bronze sculptures usually have only one layer of rust due to their short time.
Single, loose structure, poor adhesion, if you remove the floating rust will directly reveal the fresh copper body. Yandu bronze sculpture adopts advanced treatment technology to solve the problem of long-lasting oxidation resistance of the surface of the copper sculpture.
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