Sheet metal is also known as gold, also known as fire gold plating. Gold plating refers to the electroplating gold process. The same thing is that the gold is attached to the appliance (wrapping the appliance with gold). The historical inheritance of sheet metal is much earlier than that of electroplating gold. It is about 2,500 years old and it is a very old decorative craft.
The difference between sheet metal and gold plating
The premise of gold plating must have electricity. According to research, the British invented electroplating gold in the early 19th century, and it was introduced into China no earlier than 1848. It should be widely used in utensils production later.
The difference between sheet metal and gold plating
Sheet metal process
The sheet metal process is complex and very easy to cause personal injury. In a nutshell, it is an ancient process of separating gold and mercury by heating to leave gold on the surface of the object.
The gold is rolled into a thin piece of gold, cut into fine gold wire with scissors, and the gold wire and mercury (mercury) are mixed in a ratio of 1:6 and heated to 600-800 degrees to form a gold amalgam, muddy mixture.
Gold, silver, and copper all react with mercury, which is chemically called homogenization. Heating is to accelerate the homogenization reaction of gold and mercury. At normal temperature, gold and mercury can also be homogenized, that is, white gold or white patches appear in ordinary gold jewelry.
The end of the copper rod is flattened and smoothed, soaked in sour plum soup and then poured into mercury. The flat end of the copper rod is whitened and then made.
The process of smashing copper into mercury can be understood as a homogenization process that produces a white copper amalgam.
The tannins should be cleaned with a weak acid to remove the oxide film on the surface of the gold stick, making it easier for copper to react with mercury.
Apply a gold stick in advance, smear 70% nitric acid (a mixture of salt and strontium in ancient times), apply it on a copper carcass (sheet metalware), and then shovel the gold mud on the surface of the copper carcass.
蘸70% nitric acid coated carcass can be understood as the process of activating the copper matrix, removing the oxide film on the surface of the copper matrix, making copper more easily react with gold amalgam (gold mud) to form copper amalgam, thereby improving The adhesion of gold mud to copper tires.
Using hairpins made of hair and 蘸50% nitric acid to press the gold amalgam coating to make the surface of the sheet metal more uniform, this process is very important, commonly known as "three-point wipe seven-point plug", if the bolt is not good, easy Causes uneven sheet metal, insufficient adhesion or even falling off.
Rinse with hot water to wash away some of the nitrate compounds.
Heated with fire to evaporate the mercury. At 300-500 degrees, mercury begins to precipitate. Mercury beads appear on the surface of the sheet metal. The mercury beads need to be scattered with a bristle brush to avoid affecting the quality of the sheet metal. After the mercury is slowly precipitated, the sheet metal layer slowly turns from white to yellow.
Mercury is reheated to form mercury oxide, which will remain in the gold layer. It needs to be wiped gently with copper wire saponin and then baked to avoid uneven color.
Mercury may leave pores after evaporation. The teeth made of agate are repeatedly laminated with gold to enhance the adhesion of the sheet metal.
The whole process of sheet metal is very likely to occur repeatedly. It is often necessary to repeatedly apply a few times of gold mud, then bolt, bake, brush and press.
The whole process of sheet metal is accompanied by the volatilization of mercury, which is still very damaging to the human body. Mercury poisoning is accidentally caused... It is necessary to take precautions and recycle waste liquid.
Understand the use of the sheet metal process
Only by profoundly understanding the process of sheet metal can we clearly understand the craft value of sheet metal. It is reminded that sheet metal is prone to stomata when baking gold. Although the gold is compacted during the process of pressing gold, it will be mottled for a long time. The position of this stomata should be the worst adhesion. Perhaps It is the crux of the shedding.
In addition, the process of gold immersion is not only smeared with gold, but also mercury and copper. Assuming a magnification of 100 times, even a thick layer of gilt is unlikely to completely cover the copper matrix. These are the differences between sheet metal and gold plating due to different processes.
Differentiating between sheet metal and gold plating is helpful for the generation of the dynasty. The thickness of the sheet metal also reflects the state power at that time. If you can do something with thick gold, it must be a prosperous life. The sheet metal process is still in use today, but it is very rare, most of which are replaced by electroplated gold, or it can be said that electroplating gold is a substitute for sheet metal.
The term sheet metal is not very common in the wenwan industry, and is common in antiques. In addition to the difference between sheet metal and gold plating mentioned above, a more intuitive understanding is that the gold plating is thinner and the sheet metal is relatively thicker.
Women Pants,Fitness Yoga Pant,Printing Yogs Pants,Women Fitness Leggings
SHAOXING LIDONG TRADING CO.,LTD , https://www.lidong-garments.com