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How to choose suitable copper protection measures

Update:02-02-2021
Summary:

Copper is a metallic solid with a purple appearance. Th […]

Copper is a metallic solid with a purple appearance. The chemical properties of copper materials are very active. Therefore, in the process of production, use, and storage, it is unavoidable to contact with oxygen and fine dust in the air, which can easily cause oxidation and discoloration of the copper surface. Severe corrosion will affect the appearance and conductivity of copper products. According to the different alloy composition, element symbols can be divided into pure copper, brass, cupronickel, and bronze.

Pure copper, also known as red copper, is a kind of copper with good electrical and thermal conductivity, excellent plasticity and easy to cold and hot pressure processing. Wide range of universal distances: electrical switches, electronic components, air-conditioning pipes, automobile wiring boards...

The brass alloy with zinc as the main added element has a golden yellow appearance, and is often used in copper decorations, architectural hardware, heat exchange tubes, mercury, power cylinders, etc.

The copper alloy with nickel as the main added element becomes cupronickel, and medical equipment, precision instruments, watch parts, spectacle frames, etc. are all cast with cupronickel.

Originally refers to copper-tin alloy, and later except for cupronickel brass, it is called copper-tin alloy. Phosphor bronze, tin bronze, beryllium bronze, chrome bronze, etc. Mainly used for anti-wear and casting parts of tripods, bells, bearings, gears, etc.

The good quality of copper is extremely large. Copper has a lively chemical nature, which has also become a major disadvantage of copper materials. The oxidation and discoloration are fast, and there is no good protection method, which increases the production cost. Therefore, appropriate copper protection measures: passivation treatment should be selected. In other words, the corrosion rate of the copper material treated with the oxidizing medium is significantly lower than that before the treatment, which is the so-called passivation treatment. So what should I do with the oxidized discoloration? These require chemical or physical cleaning and polishing. The surface finish of copper materials has been improved. Restore its surface gloss.

Copper cleaning agent: The main agent is environmentally friendly organic acid, with high-quality inhibitors and a small amount of surfactants, and does not contain toxic heavy metals such as nitrogen, phosphorus, and potassium. It can effectively ensure that the product size is not changed during the cleaning process, and the oil and oxide scale on the copper surface are removed. It is suitable for surface finishing of various precision small parts, complex and large area products, and suitable for cleaning various copper materials. Improve the surface brightness of copper products, and can eliminate rust spots and oil stains. Acidity: PH=0.5~2 effective range.

After the restored copper parts are cleaned, in order to avoid re-oxidation, they need to be passivated again. Use weak alkaline chromium-free passivation solution, which is harmless and environmentally friendly. The stability is good, and the medicine can be used repeatedly. The passivation film is dense and has strong corrosion resistance. The ZTE salt spray test time exceeds 72 hours. After more than 3 years, it will not oxidize and change color. Usage: After degreasing or polishing the copper parts, rinse with water to avoid bringing other dirt into the passivation liquid. Most of the polishing liquid contains acidic components, so it must be rinsed to avoid bringing acidic substances into the passivation liquid. The passivation film dissolves, thus failing to provide passivation protection. After soaking, rinse with water and dry at a temperature below 100°C. In order to prevent fingerprints, hand prints can be sealed. The post-passivation effect can be increased by more than 5 times. Industrial salt spray test.

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