What are the common ways to prevent rust in metals

Common metal rust prevention methods are as follows:

First, the processed metal parts should be cleaned (cutting fluid, engine oil, grinding oil, dirt, etc.) to reduce the factors of rust.

Second, keep the storage environment of metal parts dry and clean.

3. If the metal parts have grooved holes, some anti-rust desiccant packages can be placed in these grooved holes to provide tighter moisture-proof and rust-proof protection.

Fourth, if more accurate rust prevention is required, the metal parts can be placed in the vapor phase rust prevention bag. Anti-rust bags can release VCI anti-rust gas when packaging products, which adhere to the surface of parts and even the surface of holes to provide anti-rust protection. (Anti-rust bags can be used as lining bags for cardboard boxes or wooden boxes).

Fifth, the anti-rust oil is generally used to apply to the metal surface, but the temperature in the general workshop is high, and the professional drying process should be carried out after the anti-rust oil is applied, which is more troublesome, and if the drying is not in place, it will lead to oil and stickiness on the surface. Large, will contaminate some contaminants on the surface, will also lead to rust prevention is not in place. Therefore, it is best not to use a drying water-based rust inhibitor to protect iron parts from rust.

Commonly used methods are:

1. Change the internal structure of the metal.

For example, the manufacture of various corrosion-resistant alloys, such as adding chromium and nickel to ordinary steel to make stainless steel.

2. Protective layer method.

A protective layer is applied to the surface of the metal to isolate the metal products from the surrounding corrosive medium, thereby preventing corrosion. Such as:

1) Coat the surface of the steel parts with engine oil and petroleum jelly.

paint or cover the enamel.

Corrosion-resistant non-metallic materials such as plastics.

2) Electroplating.

Hot plating, spraying and other methods are used to coat the surface of steel with a layer of metals that are not easy to be corroded, such as zinc, tin, chromium, nickel, etc. These metals are often oxidized to form a dense oxide film that prevents corrosion of steel by water and air, among others.

3) Use chemical methods to form a fine and stable oxide film on the surface of steel. For example, a fine layer of black ferric tetroxide is formed on the surface of steel parts such as machine parts and guns.

films, etc. 3. Treat the corrosive medium to eliminate the corrosive medium, such as frequently cleaning metal equipment, placing desiccant in precision instruments and adding a small amount of corrosion inhibitor that can slow down the corrosion rate in the corrosive medium.

1. Permanent anti-rust: painting, electroplating, corrosion-resistant alloy use and other methods;

2. Temporary rust prevention

1. Environmental storage, including nitrogen filling, oxygen removal, and dry storage.

2. Contact anti-rust, apply anti-rust grease, anti-rust liquid, etc.

3. Vapor phase antirust, use vapor phase antirust paper, film and other packaging materials 4, vacuum sealing.

Commonly used methods to prevent iron rusting are:

1. Forming alloys to change the internal structure of iron For example, adding chromium, nickel and other metals to ordinary steel to make stainless steel greatly increases the rust resistance of steel products.

2. Covering the surface of iron products with a protective layer is a common and important way to prevent rust of iron products. According to the composition of the protective layer, it can be divided into the following types:

a. Coating mineral oil, paint or firing enamel, spraying on the surface of iron products, for example: cars, buckets, etc. are often painted; The machine is often coated with mineral oil, etc.

b. Plating a layer of metal that is not easy to rust, such as zinc, tin, chromium, nickel, etc., is plated on the surface of steel by electroplating, hot plating and other methods. These metal surfaces form a dense oxide film, which prevents iron products from rusting in contact with water, air and other substances.

c. Use chemical methods to generate a dense and stable oxide film on the surface of iron products to prevent iron products from rusting.

3. Keeping the surface of iron products clean and dry is also a good way to prevent rust of iron products.

How to remove rust

To remove rust, you can shovel it off with various tools or soak it in an acidic solution to dissolve it. After removing the rust, the surface of the iron must be treated, coated with a layer of lead, and then painted;

Or plating it with other metals that don't rust easily. A more radical approach is to add some other metals to the iron to make a stainless alloy. The stainless steel we are familiar with is an alloy made by adding a little nickel and chromium to the steel.

1. Coating. The most widely used anti-rust treatment.

2. Zinc plating and nickel plating.

3. Heat treatment. Carburizing, nitriding, etc.

4. Chemical surface treatment. Phosphating, passivation, blackening, alkali boiling, etc.

5. Various coatings. Dacromet, spraying, lagging and vapor deposition, etc. Source late.

6. Short-term packaging. Anti-rust oil, vapor phase anti-rust paper, water-based anti-rust agent hail wild plum, cutting ridge blocking liquid, etc.

1. If there is moisture, wipe it off immediately, and store it in a dry and ventilated place;

2. Do not expose to the sun, so keep it in a cool place;

3. A layer of oil or paint can be applied to the surface to prevent metal rust.

1. Coating. The most widely used anti-rust treatment. 2. Zinc plating and nickel plating.

3. Heat treatment. Carburizing, nitriding, etc. 4. Chemical surface treatment.

Phosphating, passivation, blackening, alkali boiling, etc. 5. Various coatings. Dacromet, spraying, lagging and vapor deposition, etc.

6. Short-term packaging. Anti-rust oil, fumed anti-rust paper, water-based anti-rust agent, cutting fluid, etc.

The most common way to prevent rust on metal is spray painting, which is also the most effective method at present.

Simpler ones can be coated with oil, petroleum jelly, paint or covered with non-metallic materials such as enamel and plastic.

Plating adds an oxide layer to protect the main metal.

The same principle is applied to painting.