The treatment method of gold passivation is to passivate gold by using anodic corrosion inhibitor or strong oxidant sodium nitrite (NaNO2) which can make the surface of gold passivate.
The principle is as follows: by directly acting on the metal surface of gold, when the metal anode dissolves, a dense, well-covered, solid-phase passivated oxidation film layer is generated on the surface of gold. This film constitutes an independent solid phase film layer, which separates the surface of the gold from the air and other external media, so that the electrical displacement of the metal is positive, the surface state of the active dissolved metal is sudden, and the dissolution rate of the metal is rapidly reduced into a blunt state to avoid corrosion of the gold.
Gold passivation is caused by surface oxidation and contaminants and can be solved by the following methods:
1. Soak in dilute acid solution to wash, such as hydrochloric acid, nitric acid, etc.
2. Use special metal cleaning agent to clean;
3. Use ultraviolet lamp to remove surface oxidation;
4. Use ultrasonic cleaning machine to clean;
5. Wheat flour mixed with water to make a paste on the surface, and then wipe with a soft cloth. The above methods can help restore the luster and brightness of gold and maintain its elegant appearance.
Hehe. Find a jade or a glass ball. The friction soon returned to its original form