Copper is a kind of non-ferrous metal, metal under normal circumstances, oxidation happens, such as common iron, copper plate of the same will also because in damp, the surface of the copper pollution situation prompted purple copper oxidation discoloration, usually use copper cleaner oxidation can handle, but if you want to restore ecru or require some treatment.
One, the reasons for the oxidation of purple copper plate
1. Atmospheric humidity
Atmospheric humidity plays a great role in promoting the oxidation discoloration of copper surface. Under high humidity, the growth rate of oxidation film is faster than that in dry air, and the density of oxidation film formed is small. Therefore, under humid atmosphere, the density of oxidation film decreases, and the oxidation phenomenon of matrix protection decreases
2. Surface contamination
Surface pollution has a great influence on the oxidation discoloration of copper surface, even if it is a slight pollution such as finger print, it will make the copper surface quickly discoloration, the saturated vapor pressure of the pollution drops, which is conducive to the formation of water film, and the pollutants improve the conductivity of water film, while slowing down the electrochemical corrosion process.
3. Impurities in the environment
The impurity gas in the environment is also the main factor to promote discoloration. The experiment shows that when the environmental humidity is greater than 60%, the corrosion speed is obviously accelerated, and the effect of sulfide is more obvious. Even at 1×10-6, the surface color of copper will change quickly.
Two, processing purple copper plate oxidation method
1. Chemical polishing treatment
In general, the use of copper cleaning agent can be very easy to complete the rust removal work, but for oxidation and rust of the purple copper plate we also need to do copper chemical polishing treatment, treatment can not only quickly remove rust, oxide layer, patina can also be the original color of copper, shining at the same time can achieve smooth and smooth effect.
2. Copper hydrochloric acid pickling
The use of copper hydrochloric acid pickling method to remove the rust and oxide layer on the surface of purple copper plate is called pickling, is a method to clean the metal surface, neither toxic chromium containing substances, there is no nitrogen oxidation pollution, after cleaning its bright color uniform, excellent anti-discoloration performance, brass, red copper, phosphorus bronze are applicable, strong versatility.
3. Passivation treatment
After passivation treatment, it can effectively prevent copper rust, copper oxidation, and salt spray resistance test time is long, does not affect the electrical conductivity, is a good choice of copper product process room or corrosion inhibition, rust prevention.
Three, prevent the oxidation of purple copper plate
1. The surface of the copper can be sprayed with physical protective film of anti-rust paint, and the copper can be placed in contact with the corrosive medium in the air.
2. Electroplating protective layer, electroplating a layer of chromium nickel and other materials on the copper surface.
3. Vacuum coating and other protective measures.
4. New environmental protection passivation process, which generally uses organic heterocyclic substances to form stable coordination compounds with copper and cover the surface of copper to prevent further oxidation corrosion of copper.
The above is the copper plate in the atmospheric humidity, environmental impurities and surface pollution in the case of accelerated oxidation, resulting in rust. If the oxidation of rust part of the improper processing, will also affect our processing and use, I hope this article can help you understand the treatment of copper plate oxidation and prevention of copper plate oxidation method, if you have other related problems of copper plate, welcome to leave a message
