The main factor affecting the surface quality of the copper strip is the production process, which runs through the entire production process. The reasons for the oxidation of the copper strip are as follows:
The pre-drying time of the insert is too long.
The acid produced after the curing agent absorbs moisture corrodes the copper sheet.
Copper is an active metal element that easily loses electrons and causes oxidation.
In addition, atmospheric humidity, surface pollution, impurity gases, etc. can also cause copper ore to oxidize.
The red copper strip insert was not thoroughly cleaned before silver plating, and black marks appeared on the surface, which are cuprous salts produced after oxidation and loss of an electron.
After cleaning, if it is not dried thoroughly in time or the workmanship is poor, the residual water traces, cleaning liquid, etc. will react electrochemically with the copper element and oxygen in the air to produce black cuprous, or in severe cases, green salt.
Approach:
Strengthen the protection of inert gas during heat treatment. Because the chemical properties of copper are very active, it can undergo rapid chemical reactions with more active gas substances in the air during high-temperature heat treatment. Therefore, it is necessary to protect the inert gas more effectively to prevent copper from being oxidized.
Strengthen the cleaning of the surface of the copper strip to maintain a high degree of smoothness. During the rough rolling and annealing processes, oxides will inevitably be generated on the surface of the copper strip, which requires cleaning methods such as pickling, degreasing, and passivation.
Strengthen the control of production process. Use a brush and clean water to clean the impurities on the surface of the copper strip. Before rolling, wrap the copper strip with lining paper to prevent the surface from being scratched. In addition, the all-oil rolling method is adopted, the oil removal device of the rolling mill is modified, the rolling speed is slowed down, and all feasible methods are adopted to remove residual pollutants on the surface of the copper strip. At the same time, our production managers have strengthened production management and increased monitoring efforts.
Strengthen control over the final packaging of finished products. The copper strip must be dried after pickling. A humid environment will accelerate the corrosion of copper and affect the accuracy of the finished product. Therefore, in order to ensure the dryness of the product, double measures are taken. While drying the finished product as much as possible, when packaging, first wrap it with a plastic bag, and then wrap it with white film to effectively prevent external moisture during transportation. Influence.
