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Analysis of Common Problems in Zinc Phosphating

Analysis of Common Problems in Zinc Phosphating

Phosphating film layer is loose, corrosion resistance is poor, easy to rust (1) the residual acid on the surface of the workpiece after pickling is not completely washed and neutralized. (2) The workpiece stays in the air for too long after pickling. (3) The surface of the workpiece is over-corroded during pickling. (4) the table adjustment failure. (5) phosphating total acid is too low, free acid is too high. (6) The accelerator concentration is too low. (7) phosphating time is too short. (8) phosphating after washing is not clean or phosphating after washing acidity is too high. Phosphating film is colored (1) oil removal is not complete. (2) the table adjustment failure. (3) The total acid is too low or the free acid is too low. (4) The accelerator concentration is too high. After phosphating, the surface of the workpiece has the phenomenon of hanging ash.

20

2018

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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

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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

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11

What is the difference between silane treatment agent and slag-free phosphating agent?

What is the difference between silane treatment agent and slag-free phosphating agent?

Silane treatment agent is a process of surface treatment of metal or non-metal materials with organic silane as the main raw material. Compared with traditional phosphating, the silane treatment agent has the following advantages: no harmful heavy metal ions, no phosphorus, no heating. The silane treatment process does not produce sediment, the treatment time is short, and the control is simple. The treatment steps are few, the table adjustment process can be omitted, and the bath liquid can be reused. Effectively improve the adhesion of the paint to the substrate. Can be collinear processing iron plate, galvanized plate, aluminum plate and other substrates.

22

2020

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11

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