Phosphatization technology for hot rolling steel plate under normal temperature

A hot-rolled steel plate and process technology, applied in the field of phosphating process at room temperature, can solve the problems of different steel surface conditions, material differences, unsatisfactory corrosion resistance, unfavorable uniform distribution of electric field on the workpiece, etc., to achieve low overall cost, Excellent anti-pollution ability, easy to control the effect

Inactive Publication Date: 2014-12-31
WUXI LUOSHE TECH VENTURE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, iron-based phosphating has the advantages of easy control of the solution, stable bath solution, fast phosphating speed, low solution temperature, less sediment, long service life of the solution, no harmful environmental pollutants, and lower cost than other types of phosphating solutions. Much cheaper, but unsatisfactory corrosion resistance
Zinc phosphating is widely used by most enterprises because of its uniform and fine film layer, good decorative performance, strong adhesion to the coating, relatively stable phosphating film layer, and good corrosion resistance. However, the operators of the factory are often at a loss. In addition, the steel surface conditions in the domestic steel market are different (the rolling oil used and its material are very different), and because the phosphating solution market currently has no unified management, the technical operation standardization is lacking. Due to the limited production conditions of enterprises, it is inevitable to cause a series of disadvantages such as inconsistent process specifications. Therefore, it is necessary to propose a more standardized phosphating operation process, production process, and select a phosphating solution with better performance. the basis of
Because in the past, people only emphasized the corrosion resistance of the phosphating film itself, while ignoring the supporting performance of the phosphating film and the coating, so that the thickness of the phosphating film layer was required one-sidedly. In fact, the phosphating film itself does not bear too much corrosion resistance. Corrosion effect, whether the matching performance between him and the coating is good is the key to affect the entire coating system. The medium and high temperature phosphating film is coarse and brittle, with high porosity and high resistance, which is not conducive to the uniform distribution of the electric field on the workpiece, so it is not suitable for Electrophoretic coating and electrostatic spraying
[0003] The room temperature phosphating technology is currently the most active research, the fastest technological progress, and the phosphating technology with broad development prospects. The normal temperature phosphating solution and phosphating process still have such and such defects, so it needs further improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A normal temperature phosphating process for hot-rolled steel plates, the phosphating solution used in the process consists of: manganese dihydrogen phosphate 34g / L, zinc nitrate 48g / L, 85% phosphoric acid 5g / L, bismuth molybdate 4g / L , sodium tungstate 5g / L, sodium chlorate 3g / L, ammonium citrate 4g / L, sodium nitrate 28g / L, copper nitrate 2g / L, tartaric acid 10g / L, ethylenediaminetetraacetic acid 3g / L, urethane Tropin 4g / L, surplus is water, and described phosphating process is: put hot-rolled steel plate into lye tank and soak, then scrub to remove the oil on the surface; Rinse 2 times with clear water after going out of lye tank; Put it into the phosphating tank containing the phosphating solution composed of the above components, control the pH value of the phosphating solution to 4.5, the temperature is 10°C, and the soaking time is 12 minutes; after leaving the phosphating tank, rinse it with clean water for 3 times; then Air dry or air dry.

Embodiment 2

[0012] A normal temperature phosphating process for hot-rolled steel plates, the phosphating solution used in the process consists of: manganese dihydrogen phosphate 38g / L, zinc nitrate 44g / L, 85% phosphoric acid 7g / L, bismuth molybdate 3g / L , sodium tungstate 7g / L, sodium chlorate 1g / L, ammonium citrate 6g / L, sodium nitrate 24g / L, copper nitrate 4g / L, tartaric acid 8g / L, ethylenediaminetetraacetic acid 5g / L, urethane Tropin 2g / L, the balance is water, and the described phosphating process is: put the hot-rolled steel plate into the lye tank for immersion, then brush to remove the oil stain on the surface; rinse 3 times with clear water after going out of the lye tank; then put Put it into the phosphating tank containing the phosphating solution composed of the above components, control the pH value of the phosphating solution to 3.5, the temperature is 30°C, and the soaking time is 8 minutes; after leaving the phosphating tank, rinse it with clean water twice; then Air dry or...

Embodiment 3

[0014] A normal temperature phosphating process for hot-rolled steel plates, the phosphating solution used in the process consists of: manganese dihydrogen phosphate 36g / L, zinc nitrate 46g / L, 85% phosphoric acid 6g / L, bismuth molybdate 3.5g / L L, sodium tungstate 6g / L, sodium chlorate 2g / L, ammonium citrate 5g / L, sodium nitrate 26g / L, copper nitrate 3g / L, tartaric acid 9g / L, ethylenediaminetetraacetic acid 4g / L, Urine Lotropine 3g / L, surplus is water, and described phosphating process is: hot-rolled steel plate is put into the dipping in the lye tank, then brushes and removes the greasy dirt on surface; Rinse 3 times with clear water after leaving the lye tank; Then Put it into the phosphating tank containing the phosphating solution composed of the above components, control the pH value of the phosphating solution to 4, the temperature at 20°C, and the soaking time for 10 minutes; after leaving the phosphating tank, rinse it with clean water for 3 times; Then air dry or dry n...

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PUM

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Abstract

The invention discloses a phosphatization technology for a hot rolling steel plate under normal temperature, a phosphatization liquid employed in the technology comprises the following components: 34-38g/L of manganese dihydrogen phosphate, 44-48g/L of zinc nitrate, 5-7g/L of 85% of phosphoric acid, 3-4g/L of dibismuth trimolybdenum dodecaoxide, 5-7g/L of sodium tungstate, 1-3g/L of sodium chlorate, 4-6g/L of ammonium citrate, 24-28g/L of sodium nitrate, 2-4g/L of cupric nitrate, 8-10g/L of tartrate, 3-5g/L of ethylene diamine tetraacetic acid, 2-4g/L of urotropine and the balance of water. The phosphatization technology comprises the following steps: performing alkali washing to remove oil stain, flushing by clear water for 2-3 times after being removed from a lye tank, then placing in a phosphatization groove filled with the phosphatization liquid composed of the above components, controlling pH value of the phosphatization liquid at 3.5-4.5 and the temperature of 10-30 DEG C, immersing for 8-12 minutes; flushing for 2-3 times by clear water after being removed from the phosphatization groove, and then drying in air or naturally dying.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a normal-temperature phosphating process for hot-rolled steel plates. Background technique [0002] The surface phosphating process before steel coating can be divided into zinc-based, zinc-calcium-based, manganese-based, ferrous phosphate-based and alkali metal phosphating. The above-mentioned phosphating systems are selected by different companies for their different advantages. in use. Among them, iron-based phosphating has the advantages of easy control of the solution, stable bath solution, fast phosphating speed, low solution temperature, less sediment, long service life of the solution, no harmful environmental pollutants, and lower cost than other types of phosphating solutions. Much cheaper, but its corrosion resistance is not satisfactory. Zinc phosphating is widely used by most enterprises because of its uniform and fine film layer, good decorative performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42
Inventor 高忠清
Owner WUXI LUOSHE TECH VENTURE
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