a Metal Processing Technology
Gilt bronze four-armed Guanyin statue
The original meaning of gilding is beautiful metal. Bronze and silverware that use gilding technology to decorate their surfaces to beautify them are called gilt ware. Judging from the cultural relics such as bells and tripods, weapons, chariots, coins, and seals unearthed in the past dynasties, the gilding process began during the Spring and Autumn Period and the Warring States Period. The use of gold and silver became a characteristic of bronze processing at that time. During cnc quote the Sui and Tang Dynasties, gilding craftsmanship continued to improve and was widely used in the decoration of palaces, temples, towers, and Buddha statues. In the Song Dynasty, the attainments were deeper and spread to Japan. It was still commonly used after the Ming and Qing Dynasties. Gibbons from the Spring and Autumn Period and the Warring States Period, Changxin palace lanterns from the Western Han Dynasty, golden invitations and bronze rulers from the Eastern Han Dynasty, silver pots with dancing horses and cups from the Tang Dynasty, and large gilt bronze wares such as those from the Royal Garden of the Forbidden City in Beijing and the Qianqing Palace in the Qing Dynasty. The lions, copper vats, copper swans in the Summer Palace, and the Buddha statues in the Lama Temple are all famous gilt vessels. Gilding, according to Wang Aijun of Junyouhui, is a gilding method using fire. Plating is best made of pure copper, sterling silver or grained silver. However, pure copper oxidizes too quickly during high-temperature casting, and the surface decoration of the casting is not easy to be fine. If made of bronze or brass, the tin or zinc content should not exceed 20%. Before starting the gold plating operation, you need to use a hammer to flatten the front end of a copper rod about fifteen centimeters long and one centimeter in diameter, and tilt it slightly like a small shovel. The surface of the copper rod needs to be cleaned and polished, the front end is coated with hot sour plum soup and immersed in mercury. After applying and soaking for several times. The front end of the copper rod was filled with mercury to make a gold rod, which was the main tool used in work. In the second step, the gold is sliced and cut into pieces, put into a crucible heated to 400 degrees Celsius, and then poured in mercury. The weight ratio of gold to mercury is about three to eight. After the gold is dissolved by mercury, the solution is poured into water and cooled, and it becomes a thick gold paste. Dip the gold rod into gold mud and apply it to the surface of the plated product. Dip a fine brush into 50% nitric acid and apply evenly. It is then baked over a slow fire to evaporate the mercury on the entire gilded surface. When a layer of white smoke appears, stop baking and tap the coating surface with a hard brush to make the gold adhere. Continue beating until the plate has cooled slightly and the mercury has stopped evaporating. Then bake again and stir. Repeat this process three to four times. The baking temperature needs to be higher each time. Blow dry with saliva until the water droplets roll off the surface of the plating, and do not stop heating. In addition, the surface needs to be wiped with cotton, because when the gold paste is heated to a higher temperature, a large amount of mercury evaporates into gas, but some of it is still condensed on the plating and needs to be wiped off. . In this way, while the plastic CNC is baking and rubbing, the gold will be closer to the plated product. When the mercury is baked and vaporized, all the gold is exposed. Finally, in order to make the gold-plated surface strong, durable and uniform in color, a calendering knife such as agate or jade is often used to carefully polish the gold-plated surface to make it smooth. This gold plating technique has many advantages. The gold-plated surface is durable and the color is beautiful. Suitable for large and small vessels without extensive equipment and tools. The operation method is simple and easy. The thickness of the gold plating can be freely controlled to fix buildings or larger vessels. , no need to move, can be constructed on site.
