? Gold plating is the process of placing a thin layer of gold on the surface of metals such as silver and copper.
Gold-plated jewelry carries the mark of GP or KP, and has bright, clear colors, such as golden yellow, peach, rose red and so on. As it is easy to wear and fade, wearing gold-plated jewelry should pay attention to avoid contact with acid and alkali substances. According to national regulations, the gold-plated jewelry can not be less than 0.5 microns of gold-plated layer, a micron is only 0.001 mm.
Gold plating of homogeneous materials refers to the surface of gold jewelry for gold plating treatment. Its significance is to improve the brightness and color of the jewelry; heterogeneous material gold plating refers to the surface of non-gold materials for gold plating treatment, such as silver plating, copper plating. Its significance is to replace the color of the plated material with the luster of gold, so as to improve the ornamental effect of the jewelry.
Gold plating process development history briefly:
In ancient times, due to the rarity of gold and people's love of gold products, people began to coat the surface of the object with a layer of gold to meet the demand. China was the first country to apply gold to objects, a process known as gilding. It is recorded that the technique of gilding by fire appeared during the Eastern Han Dynasty, but in fact this technique appeared as early as the Warring States Period.
With the development of technology, the process of utilizing chemicals for gilding appeared in the 17th century and began to be widely used in industries such as decorations and tableware. In the 20th century, with the development of electronics and other high-precision products, new processes such as pulse gold plating process, electroplating process and other new processes appeared.