HydroPro-LHJ Filter

HydroPro-LHJ Filter for Phosphating Solution Filtration
HydroPro-LHJ Filter for Phosphating Solution Filtration

HydroPro-LHJ self-cleaning filter is very suitable for the phosphating liquid filtration process. In addition to regular sizes, we can also customize special specifications and materials.

HydroPro-LHJ self-cleaning filter is mainly used in the filtration process of phosphating solution.
Phosphating solution is a mixed chemical reagent, mainly composed of zinc nitrate, phosphoric acid, zinc oxide, and water. Here’s what it does:

  • Enhance the bonding force between the coating film layer (such as paint coating) and the workpiece.
  • Improve the corrosion resistance of the surface coating of the workpiece after painting.
  • Improve decoration.
  • Improve the wear resistance of the workpiece.
  • Make the workpiece lubricious during machining.
  • Improve the corrosion resistance of the workpiece.

It can be seen that phosphating solution is a very important chemical reagent. Its usage is:

  • First, calculate the amount of each chemical required based on the size of the phosphating tank.
  • Then put zinc oxide in the mixing barrel, add water, and stir to form a thick slurry.
  • Slowly add phosphoric acid while stirring.
  • After the solution has finished exothermic, add it to the phosphating tank that has been filled with water.
  • Finally, add zinc nitrate to the phosphating tank, stir evenly, and then use.

However, there were no professional phosphating fluid filters on the market before. For this reason, we have developed the HydroPro-LHJ series of self-cleaning filters. Through a large number of terminal tests and customer feedback, this series of products has excellent filtration effects in the phosphating liquid filtration process.
Advantages: Remove the suspension in the phosphating liquid, recycle the phosphating liquid, and improve the phosphating effect. While solving environmental problems, it can also obtain considerable economic benefits.

HydroPro-LHJ self-cleaning filter drawing

Technical Parameters

ModelInlet and outletHH1H2H3H4WDrainageMax flowWeight

HydroPro-LHJ Self-Cleaning Filter for Phosphating Liquid Suspended Solids Filtration

Pre-treatment plays a very important role in automotive painting. Painting is an economical and effective way to resist corrosion and decorate your vehicle. As the first process of automobile painting, the quality of pre-treatment is an important link that directly affects the service life and decorative results of the coating. The purpose of automotive pre-painting treatment is to remove foreign matter on the vehicle body and provide a good base suitable for painting requirements through chemical film-forming treatment methods. This ensures that the coating has good anti-corrosion properties and decorative properties.
The phosphating process in the automobile pre-treatment process is a major process that determines the quality of automobile painting pre-treatment. The accumulation of phosphating slag will not only cause the loss of phosphating liquid but also directly affect the quality of automobile surface treatment.

Phosphating residue

During the phosphating process, phosphoric acid will also appear while generating a phosphating residue. The release of phosphoric acid will maintain the free acidity of the phosphating solution, inhibit the hydrolysis of the phosphating solution, and maintain the balance of the phosphating solution. This is beneficial to the continuation of phosphating. However, as phosphating production proceeds, the amount of residue in the phosphating solution will become larger and larger. As a result, the harm to phosphating will become greater and greater.

First, residue particles easily adhere to the surface of the workpiece. And it is difficult to clean, commonly known as hanging dust. When the dust is severe, it will affect the quality of the phosphating film and affect subsequent processes, especially electrophoretic painting.

Secondly, too much residue in the phosphating solution will cause clogging of the spray phosphating nozzles. Thereby directly affecting the normal progress of phosphating.

Furthermore, the phosphating residue is deposited on the heater to form a heat insulation layer. It affects the heating of the phosphating solution and wastes energy.

In addition, the generation of phosphating residue consumes the active ingredients of the phosphating agent. The service life of the phosphating bath liquid is reduced, which increases the cost of phosphating. At the same time, the workload of removing phosphating residues will increase. Therefore, regular removal of phosphating residues is essential.

There are many ways to remove phosphating residues. Among them, in the pretreatment process, we recommend the use of HydroPro-LHJ self-cleaning filters. It occupies a small area, requires less equipment investment, has a high degree of automation, and can be produced continuously. It has high separation precision, strong selectivity, low energy consumption, and little pollution.