The following are practical methods to improve the corrosion resistance of copper, classified by priority and technical feasibility:

1. Coating Protection Law (most commonly used)

Principle: Isolate copper from corrosive media (water, oxygen, acidic substances).

Operation method:

Spray or dip coat polymer coatings such as epoxy resin and polyurethane;

Using nano ceramic coatings (such as alumina and silica) to enhance high temperature resistance;

Electroplated nickel and tin metal layers (suitable for precision parts).

Advantages: Low cost, simple operation, suitable for scenarios such as pipelines and building decoration.

2. Alloy modification method (long-term solution)

Principle: Adding other metal elements to change the crystal structure of copper and enhance stability.

Operation method:

Add 2-5% tin during melting to make brass (resistant to seawater corrosion);

Add 10-30% nickel to make white copper (resistant to high temperature oxidation);

Trace phosphorus and arsenic refine grain size and reduce electrochemical corrosion.

Advantages: Significant improvement in corrosion resistance, suitable for manufacturing marine parts and chemical equipment.

3. Surface passivation treatment (precision protection)

Principle: Generate a dense oxide film through chemical/electrochemical means.

Operation method:

Chemical passivation: soaking in benzotriazole (BTA) solution to form a protective film;

Electrolytic polishing: removing surface burrs and reducing the starting point of corrosion;

Anodizing: Electricity is applied to generate a CuO/Cu ? O oxide layer (electrolyte formula needs to be controlled).

Advantages: Preserving the natural color of purple copper, suitable for electronic components and artworks.

4. Environmental Control Law (Auxiliary Measures)

Principle: Reduce the concentration of environmental corrosion factors.

Operation method:

Control humidity below 60% (using desiccants or dehumidification equipment);

Avoid contact with sulfides and chlorides (such as in coastal or chemical plant environments);

Fill the enclosed space with nitrogen inert gas for protection.

Advantage: No need to change the material itself, suitable for museum collections and precision instruments.

precautions

Combination application is better (such as passivation before coating);

Cost ranking: Environmental control>Alloy modification>Coating>Passivation;

The white copper+nano coating solution is preferred for high temperature and high humidity environments.

Disclaimer: Some pictures and texts on this site are collected from the Internet and are only for learning and communication. The copyright belongs to the original author and does not represent the views of our site. This site will not bear any legal responsibility. If your rights are violated, please contact us to delete it in time.