How to repair unearthed bronzes?

Bronze ware is a kind of utensils made of bronze alloy (alloy of copper and tin), which constantly reacts with soil from the time of burial, producing all kinds of green, blue, red and black rust. After the bronze ware was corroded, it absorbed water, which accelerated the corrosion speed of the bronze body until the bronze body became rust.

Bronze ware interacts with various chemicals around it for a long time in different environments, forming an oxide film on its surface. The skin color is warm and moist, and the texture is thick. There are jujube skin red, green lacquer ancient, black lacquer ancient, black green, yellow green and other skins.

Most of the unearthed bronzes show different shades of green rust, and some thin green rust on the surface of bronzes is mixed with blue rust, black rust, soil rust and red rust. Most of the green rust comes from bronze pits. The bronzes unearthed in the cellar belong to atmospheric corrosion in a closed environment because they are not in direct contact with soil, while bronzes are quite stable in weak and medium concentration non-oxidizing acids lacking oxygen.

Extended data:

Repair and maintenance

1, welding

For an incomplete unearthed bronze cultural relic, it is necessary to weld the bronze into a finished product. Welding is an important link in traditional repair technology, and it is the main means to repair damaged bronzes and restore their shapes.

It is necessary to adopt different welding methods according to the different properties, damage and corrosion of bronze, that is, "big welding" and "small welding". File the welded joint with a hammer, then melt the tin with an electric soldering iron and inject it into the bronze to be repaired for welding.

2. Complement

Complementary matching is an important technology to repair the defective parts in traditional bronze restoration technology. Complement means that an incomplete bronze ware is incomplete. According to the types, shapes and incomplete parts of bronzes.

Complementary colors should be developed according to the decorative patterns of bronzes, and then the shapes of complementary colors are made through the decorative patterns, and then a finished bronze cultural relic is spelled out.