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Surface Treatment Of Aluminum Radiator
Jiangsu Guokai Autoparts Co.,Ltd | Updated: May 19, 2017

In order to make the squeeze out of the Aluminum Radiator appearance is more beautiful, it is necessary to carry out a certain surface treatment.

First, the Aluminum Radiator surface mechanical polishing:

1, mechanical polishing process: coarse grinding, fine grinding, polishing, polishing, sandblasting, brushing or rolling, according to the rough surface of the system to take appropriate different processes.

Second, chemical degreasing:

Chemical degreasing process is through the chemical reaction and physical and chemical effects, in addition to the surface of the oil products. Chemical degreasing is carried out using weakly alkaline solutions.

Chemical degreasing formula and process conditions:

1, formula: sodium hydroxide 30-50G / L, industrial detergent 0.5-1ML / L, water 70-125G.

2, the process conditions: Temperature: 50-60 ℃ Time: 1-2min

3, degreasing with water after washing.

4, chemical oxide film: acid pickling treatment to neutralize the surface of the residual parts of the lye, and in addition to its natural oxide film, so that exposed parts of aluminum and aluminum alloy matrix, for silicon-containing aluminum alloy, must Pickled with a mixed solution to remove dark silica floating ash from its surface.

Aluminum Radiator Pickling formula:

Concentrated liquid 50 ~ 270ML / L

Temperature: room temperature: 1-3min

Except for silicon-containing aluminum alloy surface oxide film and silica floating ash pickling lotion formula:

Concentrated nitric acid 3 volume; concentrated hydrofluoric acid 1 volume.

Temperature: room temperature: 5-15min

Aluminum and aluminum alloy parts after chemical pickling, you must immediately use the activities of warm water and cold water to remove the residual acid, and then immersed in water to prepare for chemical polishing.

5, chemical polishing:

Aluminum Radiator Chemical polishing is the use of aluminum and aluminum alloy in acid or alkaline electrolyte solution in the selective self-dissolution, to flatten the surface of the polishing system to reduce its surface roughness, PH chemical processing methods. This polishing method has the advantages of simple equipment, no power supply, no restriction on the size of the parts, high selling speed and low processing cost.

The purity of aluminum and aluminum alloys has a great effect on the quality of chemical polishing. The higher the purity, the better the polishing quality, and the worse.

Chemical polishing is carried out using a simple viscous liquid film theory.

Polishing liquid formula and process conditions:

Formula 1: (parts by weight)

Concentrated sulfuric acid 75%; concentrated sulfuric acid 8.8%; concentrated nitric acid 8.8%; urea 3.1%; ammonium sulfate 4.4%; copper sulfate 0.02%.

Temperature: 100-200 ℃ Time: 2-3min

Formula 2: (parts by weight)

Concentrated phosphoric acid 85%; concentrated nitric acid 5%; glacial acetic acid 10%.

Temperature: 90-105 ° C Time: 2-5 min

Preparation of polishing solution:

1, the first phosphoric acid, sulfuric acid and nitric acid in accordance with a certain (%) weight, gradually into the polishing tank, carefully bar.

2, and then by the ingredients of the formula, respectively, with water dissolved (%) of the weight of glacial acetic acid, urea, ammonium sulfate, copper sulfate into the tank and mix well.

3, and then, in the state of mixing, gradually adjust the polishing solution to the required temperature range of each formula, you can carry out chemical polishing.

Third, the impact of chemical polishing process conditions:

1, Aluminum Radiator the temperature impact: the temperature should be controlled between 90-115 ℃, of which the best temperature of 105 ℃.

2, Aluminum Radiator the impact of polishing time: polishing time and polishing temperature is inversely proportional to the temperature to extend the polishing time, high temperature polishing time.

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Jiangsu Guokai Autoparts Co.,Ltd