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Detailed explanation of pretreatment process of steel coating

Detailed explanation of pretreatment process of steel coating

Iron and steel products are often in contact with the air, due to the oxygen and water in the atmosphere and may have the role of SO2, CO2, H2S, etc., it is prone to corrosion, resulting in reduced performance or even damage of steel products. Therefore, it is necessary to eliminate the adverse factors affecting the quality of the coating in the pre-coating treatment. The quality of the pretreatment of steel coating has a great influence on the quality of the coating, which is mainly reflected in the following: 1. Enhance the adhesion of the coating to the steel surface (binding force). 2. Improve the anti-corrosion performance (anti-rust) of the coating on steel. 3. Improve the leveling and gloss of the coating. 4. Reduce coating blistering, pinholes, sand spots and other appearance defects.

19

2018

/

10

Analysis of Dust Hanging Problem of Galvanized Sheet Ceramic

Analysis of Dust Hanging Problem of Galvanized Sheet Ceramic

The problem of hanging ash on the surface of galvanized sheet mainly appears in two aspects, the first is the excessive corrosion of the surface of the substrate, and the second is the pollution of the external impurities in the process of the galvanized sheet. Excessive corrosion of galvanized sheet generally appears in the following aspects: Galvanized sheet in degreasing free alkalinity is too high, resulting in excessive corrosion of galvanized sheet surface. The addition of caustic soda to the degreasing agent for galvanized sheet leads to excessive corrosion of the surface of the galvanized sheet during degreasing. Galvanized sheet degreasing temperature is too high, too long caused by excessive corrosion of galvanized sheet. Galvanized sheet in the pretreatment process by acid (such as acid tank, acid gas, acid tank after washing tank, etc.)

20

2018

/

10

Pretreatment process and method of aluminum alloy

Deoiling process and method of aluminum alloy 1 The chemical activity of metal aluminum is very high. It is quickly oxidized in the air to form a natural oxide layer. This natural oxide layer has a certain protective effect on aluminum. However, if passivation treatment or coating (painting and powder spraying) treatment is to be performed, the oxide layer must be removed first to ensure the uniformity and integrity of the passivation film. 2 aluminum alloy chemical degreasing can be used in alkaline degreasing and acidic degreasing, but also through sandblasting or rolling treatment to achieve degreasing and descaling purposes. 3 aluminum alloy alkaline degreasing generally use MD-265 weak alkaline alloy degreasing agent, strong alkaline degreasing will corrode and blacken aluminum alloy

20

2018

/

10

Classification and process control of aluminum chromizing process

Classification and process control of aluminum chromizing process

Classification and Process Control of Aluminum Chromization Process ◆ Aluminum Hexavalent Chromium Passivation-Contains Hexavalent Chromium, Hexavalent Chromium is a cancer substance, which is not environmentally friendly, but its passivation film has excellent anti-corrosion performance, low market price, traditional chromization process, and low formulation technology content. ◆ Aluminum trivalent chromium passivation-does not contain hexavalent chromium, the passivation film meets the ROHS requirements of the European Union, the corrosion resistance of the passivation film is equivalent to that of hexavalent chromium passivation, the market price is higher, and the formula technology content is higher. The development trend of aluminum chromization and its adaptability 1, the traditional chromization process because of the toxic hexavalent chromium Cr6, has been listed

22

2018

/

11

No slag phosphating agent generally how to use?

No slag phosphating agent generally how to use?

Slag-free phosphating agent is a new surface treatment technology popularized in recent years. Due to its many advantages, it has attracted the attention of many people as soon as it comes out. Slag-free phosphating agent is relatively simple to use, does not need heating, has high working efficiency, has no three wastes discharge, can effectively improve working conditions, is economical and practical, does not need special equipment, and is especially suitable for immersion phosphating process.

17

2020

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11

What are the problems in the phosphating process of slag-free phosphating agent?

Slag-free phosphating agent is a new type of zinc phosphating agent, which is a revolutionary technological breakthrough to the traditional zinc phosphating agent. It can be used at room temperature without slag and form a gray phosphating film. Slag-free phosphating is a process in which a metal reacts with dilute phosphoric acid or acid phosphate to form a phosphate protective film. So, slag-free phosphating as a new type of phosphating agent, how to control to do the best, in order to better produce high-quality products, let's take a look at the slag-free phosphating agent phosphating process what are the problems?

20

2020

/

11

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