Analysis of anti oxidation and anti discoloration treatment methods for Precision copper stamped parts

Copper itself has a relatively active chemical property. During the stamping process, there will be processing residues such as stamping oil, fingerprints, dust, etc. on the surface of Copper pressed components, and a small amount of oxide layer will also be formed. After these residues come into contact with oxygen and moisture in the air, a chemical reaction occurs, causing the surface of Copper pressed stamped parts to gradually oxidize, discolor, and turn black, damaging the appearance and conductivity of the product. Especially in humid, high-temperature, or corrosive environments, the oxidation rate will significantly accelerate. Therefore, anti oxidation treatment after stamping is essential and a key step to ensure product quality.

The anti oxidation and anti discoloration treatment of Custom metal copper stamped needs to follow a closed-loop process of "pre-treatment passivation post-treatment", with each link closely connected to ensure the treatment effect. The first step is passivation pre-treatment, with the core being oil and grease removal. It is necessary to thoroughly remove the stamping oil, fingerprints, dust, and oxide layer on the surface of the copper parts to avoid incomplete passivation film caused by unclean surface, which affects the anti oxidation effect.

Under normal circumstances, copper bright cleaning agents can be used to directly achieve dual effects of oil and oxidation removal; If the surface oil stains are severe, alkaline degreasers can be used for initial degreasing, followed by secondary treatment with bright cleaning agents. In addition, additional auxiliary processes such as chemical polishing (to improve surface brightness), vibration grinding (to remove burrs), and wire drawing treatment (to obtain wire drawing texture) can be added according to the special requirements of Customized electrical stamping copper spring.

Passivation and anti-oxidation treatment is the core step of Customized metal stamping copper anti-oxidation, which directly determines the product's anti-oxidation ability. Environmentally friendly chromium free passivation solution is preferred for treatment, balancing environmental friendliness and protective effect. This process is easy to operate. Simply place the pre treated and surface clean copper parts into a passivation solution and allow them to fully contact and react for more than 5 minutes to form a dense and complete passivation protective film. This effectively isolates air, moisture, and copper substrate from contact, preventing Stamping processing copper connecting oxidation and discoloration. It should be noted that the conventional passivation solution is weakly alkaline, and acidic liquids should be avoided from entering the passivation solution to prevent the passivation solution from becoming ineffective and affecting the passivation effect.

After passivation treatment, two post-treatment processes, water washing and drying, need to be carried out to ensure long-lasting anti oxidation effect. Adequate water washing is required between each processing step to prevent the chemicals from the previous process from entering the subsequent steps, contaminating the treatment solution and causing poor surface treatment of the Copper spring contacts. The drying process requires strict temperature control, generally between 80-100 ℃, to avoid using excessively high temperatures for baking and prevent the passivation film from being damaged due to high temperatures, thereby losing its anti-oxidation protection function. The entire processing process needs to be operated in a standardized manner to ensure that each step meets the standards, in order to maximize the anti oxidation effect and ensure the quality and service life of Copper sheet metal fabrication.

If you encounter any process difficulties or have any related processing needs in the oxidation and discoloration prevention treatment of Precision copper stamped parts, please feel free to communicate with us at any time. We will provide professional processing suggestions and adaptation solutions based on your product scenario, helping you avoid oxidation risks and ensure product quality.