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.