What Causes Copper Oxidation

There are many reasons for the oxidation of red copper, copper is a kind of active metal element, easy to lose electrons to produce oxidation. The reason for its oxidation may be that the red copper insert is not thoroughly cleaned before silver plating, and there will be black imprint on the surface, which is the cuprous salt generated after oxidation loses an electron.

It may also be that after cleaning, it is not timely and thoroughly dried or the process is not good, and the residual water trace and cleaning liquid react with copper and oxygen in the air to generate black cuprous, which is green salt in serious cases.

It may also be because the silver plating thickness is not enough or the coating falls off, oxidation in a high temperature environment, or the embedded parts are stored for a long time, and the pre-drying time of the embedded parts is too long. In addition, atmospheric humidity, surface pollution, impurity gases in the environment can cause copper oxidation.

Barrier copper and air contact: At the same temperature, the content of water vapor in the atmosphere and the percentage of saturated water vapor content, called relative humidity. Below a certain relative humidity, the discoloration rate of red copper oxidation is slow, when higher than this relative humidity, the discoloration rate will increase abruptly, this relative humidity is called the critical humidity. The critical humidity of red copper oxidation is generally between 45% and 60%. The atmospheric relative humidity has great influence on the oxidation and discoloration of red copper. When the atmospheric humidity is higher than the critical humidity, water film or water beads will appear on the surface of red copper.

If you have any questions, please contact us. Our company can produce various customized needles, medical needles, puncture needles, hypodermic needles, biopsy needles, vaccine needles, injection needles, syringe needles, veterinary needles, pencil point needle, ovum pick up needles, spinal needles, etc. If you need customized needle products, please contact us. We look forward to your inquiry! The quality of the products manufactured in our factory will surely satisfy you!

Please contact us if you need: zhang@sz-manners.com