The main way to prevent metal from rusting

Choose corrosion-resistant materials

Mainly use non-ferrous metal alloys and stainless steel.

Prefabricated metal (alloy) or non-metal coating on metal surface

1. Conversion coating: blackening (bluening), phosphating, anodic oxidation;

2. Surface alloying: nitriding, zincizing, siliconizing, aluminizing, chromizing, etc.;

3. Metal coating: electroplated metal, sprayed metal, hot-dip plating, chemical plating, etc.;

4. Non-metal covering: enamel, ceramics, paint, plastic, rubber, etc.;

5. Coating anti-rust materials: anti-rust water, cutting fluid, vapor phase corrosion inhibitor, peelable plastic, anti-rust Oil, anti-rust grease, etc.

Cathodic Protection

An electrochemical method that protects the cathode by sacrificing the anode. For example, in seawater, a magnesium block is used as an anode to connect the steel plate, and the steel plate becomes a cathode for protection by passing an electric current. Underground pipelines and chemical equipment are also another anode and energized to protect the steel parts (cathode).

Controlling environment and anti-corrosion

1. Use dehumidifiers and humidifiers to lower the temperature, control the relative humidity below 60-70%, and slow down the corrosion of metals; when the relative humidity is below 60%, non-metals will not mold and deteriorate;

2. Nitrogen filling or vacuum packaging can delay corrosion;

3. Corrosion inhibitor is built in the package;

4. When iron and steel products are heated in an electric furnace (high temperature), a protective atmosphere is formed in the furnace or heated by real home.

In summary, there are many methods to prevent metal corrosion, and the choice should be made after considering many factors, such as: the working environment of the parts, the application conditions of the parts, the safety of production, the degree of pollution to the environment, and the manufacturing cost.