Sound advice on preventing metal corrosion, how to prevent metal corrosion?

This is a lot, including painting, metallization, anodic protection (plus a piece of metal that is more susceptible to corrosion than the metal to be protected), cathodic protection (flux). The main ones are the above aspects, if you know more about them, you can consult the books.

With the exception of a few metals such as gold and platinum, the vast majority of metals are corroded in air and water. A simple principle to prevent metal corrosion is to isolate the metal from a corrosive environment. An extreme example is placing a metal in a vacuum, so that even the very reactive metal sodium retains its metallic luster.

This is usually done by placing the metal in an environment that strengthens its oxide film, such as an appropriate alkaline electrolyte (silicate, phosphate, chromate, etc.), or by creating such an isolation layer on the metal surface. This isolation layer can be formed on the surface of the metal itself, such as oxidation, passivation, phosphating, etc., or it can be an isolation layer formed by other substances, such as paint, metal plating, etc.

The other type is electrochemical anti-corrosion methods, that is, the so-called cathodic protection, anodic protection, etc. Dinitrol system strong corrosion protection material solves the problem of metal corrosion. Since anti-corrosion engineering is a specialized engineering technology that involves a wide range of applications, we only briefly summarize the anti-corrosion methods as follows:

1) Non-metallic protective layer. Corrosion-resistant non-metallic substances, such as paint, spray paint, enamel, ceramics, glass, asphalt, polymer materials (such as plastic, rubber, polyester), etc., are applied to the metal surface to be protected to isolate the metal from the corrosive medium.

2) Metal protective layer. Cover the protected metal surface with a metal or alloy with strong corrosion resistance, and the covering methods include electroplating, hot spray plating, vacuum plating, etc.

Hello and thank you for your question. Corrosion prevention is to protect metal items that are easy to rust by taking various methods to achieve the purpose of prolonging their service life, usually using physical anti-corrosion, chemical anti-corrosion, electrochemical anti-corrosion and other methods. Usually the metal surface is covered with dust, oil, oxide scale, rust, contaminants, salts or loose old paint films.

Among them, oxide scale is the most common but most neglected part. Oxide scale is a dense oxide layer produced when steel is forged and formed at high temperatures, which is usually relatively strong, but it is brittle compared to steel itself, and it is a cathode, which will accelerate metal corrosion. If these substances are not removed, direct coating will affect the adhesion and anti-corrosion ability of the entire coating.

Metal protection for the causes of metal corrosion to take the method to prevent metal corrosion, the commonly used methods are: 1. Structural change method. For example, the manufacture of various corrosion-resistant alloys, such as adding chromium and nickel to ordinary steel to make stainless steel.

2. The protective layer method covers the metal surface with a protective layer to isolate the metal products from the surrounding corrosive medium, so as to prevent corrosion. Such as: 1. Coat the surface of steel parts with oil, petroleum jelly, paint or cover enamel, plastic and other corrosion-resistant non-metallic materials.

2. Electroplating, hot plating, spray plating, etc.

The corrosiveness of metal materials refers to a damage phenomenon caused by chemical or electrochemical action when the metal hail material and the surrounding medium come into contact. Because the corrosion of metal materials can cause equipment to run, run, drip, leak, pollute the environment, and even poisoning, fire, and other vicious accidents and serious waste of resources and energy, it is necessary to carry out anti-corrosion and bright treatment of metal materials. The main anti-corrosion measures for metal materials are as follows:

1. Choose different materials to form corrosion-resistant alloys according to different Jingye disturbances;

2. Cover the metal surface with various protective layers, such as metal phosphating treatment;

3. Electrochemical protection;

4. Corrosion inhibitor method, corrosion inhibitor method.

The corrosiveness of metal materials refers to a damage phenomenon caused by chemical or electrochemical action when metal materials and surrounding media come into contact. Because the corrosion of metal materials can cause equipment to run, run, drip, leak, pollute the environment, and even poisoning, fire, ** and other vicious accidents and serious waste of resources and energy, it is necessary to carry out anti-corrosion treatment on metal materials. The main anti-corrosion measures for metal materials are as follows:

1. Choose different materials to form corrosion-resistant alloys according to different uses;

2. Cover the metal surface with various protective layers, such as metal phosphating treatment;

3. Electrochemical protection;

4. Corrosion inhibitor method, corrosion inhibitor method.

Paint (this is often used): The surface is coated with source wax.

Greased (generally bai

Semi-finished products are used when they are put into storage, and they are mostly used for time.

は does not long defense.

zhi rot);

Electroplating (e.g. steel plating, zinc plating, chrome plating, etc.).

Hot-dip galvanizing (generally speaking, the surface is treated with alkali and acid to soak the steel in molten zinc water for a while and then take it out, it is said that the steel plate can be used in the open air for 10 years after this treatment, so the power supply tower is generally used in this way to prevent corrosion);

sacrificial anode method (this is a principle with steel galvanizing);

Energized (DC cathode) protection;

In the passivation method, a dense oxide film is formed on the surface of some alloys with a strong oxidizing agent, which can isolate the erosion of corrosive media;

There are many others, but they are all used in special industries.