Surface phosphating process of special-shaped steel tube

A special-shaped steel pipe and surface phosphating technology, which is applied in the direction of metal material coating process, can solve the problems of serious environmental pollution, difficult film formation, thin and loose phosphating film, and achieves simple production process and fast film forming speed. , The effect of strong corrosion resistance

Inactive Publication Date: 2014-10-08
张家港市华尊宝特种材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is: to overcome the technical deficiencies in the prior art that the phosphating film is thin and loose, difficult to form a film, and the process pollut

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A surface phosphating process for special-shaped steel pipes, which sequentially includes degreasing, water washing, surface activation and rust removal, water washing, drying, phosphating, water washing, saponification, and drying. In the phosphating process, the formula of the phosphating solution is: P0 4 3- 0.17mol / l, Zn 2+ 0.12mol / l, NO 2- 0.1mol / l, Na + 0.13mol / l, Ca 2+ 0.11mol / l, Ni 2+ 0.12mol / l, Mg 2+ 0.1mol / l, Cl-0.1mol / l, potassium sodium tartrate 0.1mol / l, F-0.1mol / l; pH value is 2.5; phosphating temperature is room temperature, and phosphating time is 20min.

[0019] The degreasing operation adopts alkaline degreasing method, and the degreasing operation adopts soda lime.

[0020] The surface activation rust removal operation uses 30% hydrochloric acid as a rust remover.

[0021] Molybdate is also added in the phosphating solution, and the concentration of the molybdate is 1.2 g / l.

[0022] The loading density of special-shaped steel pipes in the pho...

Embodiment 2

[0024] A surface phosphating process for special-shaped steel pipes, which sequentially includes degreasing, water washing, surface activation and rust removal, water washing, drying, phosphating, water washing, saponification, and drying. In the phosphating process, the formula of the phosphating solution is: P0 4 3- 0.18mol / l, Zn 2+ 0.13mol / l, NO 2- 0.2mol / l, Na + 0.14mol / l, Ca 2+ 0.12mol / l, Ni 2+ 0.14mol / l, Mg 2+ 0.15mol / l, Cl-0.12mol / l, potassium sodium tartrate 0.12mol / l, F-0.12mol / l; pH value is 2.8; phosphating temperature is room temperature, and phosphating time is 25min.

[0025] The degreasing operation adopts alkaline degreasing method, and the degreasing operation adopts sodium phosphate.

[0026] The surface activation rust removal operation uses 30% hydrochloric acid as a rust remover.

[0027] Molybdate is also added in the phosphating solution, and the concentration of the molybdate is 1.3 g / l.

[0028] The loading density of special-shaped steel pipes...

Embodiment 3

[0030] A surface phosphating process for special-shaped steel pipes, which sequentially includes degreasing, water washing, surface activation and rust removal, water washing, drying, phosphating, water washing, saponification, and drying. In the phosphating process, the formula of the phosphating solution is: P0 4 3- 0.19mol / l, Zn 2+ 0.15mol / l, NO 2- 0.26mol / l, Na + 0.15mol / l, Ca 2+ 0.14mol / l, Ni 2+ 0.14mol / l, Mg 2+ 0.16mol / l, Cl-0.14mol / l, potassium sodium tartrate 0.13mol / l, F-0.14mol / l; pH value is 3.2; phosphating temperature is normal temperature, and phosphating time is 25min.

[0031] The degreasing operation adopts alkaline degreasing method, and the degreasing operation adopts soda lime.

[0032] The surface activation rust removal operation uses 30% hydrochloric acid as a rust remover.

[0033] Molybdate is also added in the phosphating solution, and the concentration of the molybdate is 1.5 g / l.

[0034] The loading density of special-shaped steel pipes in ...

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Abstract

The invention relates to the technical field of special-shaped steel tubes, and in particular relates to a surface phosphating process of a special-shaped steel tube. The phosphating process comprises the following steps: preparing a phosphating liquid from 0.17 to 0.2mol/l of PO4<3->, 0.12 to 0.16mol/l of Zn<2+>, 0.1 to 0.3mol/l of NO<2->, 0.13 to 0.16mol/l of Na<+>, 0.11 to 0.15mol/l of Ca<2+>, 0.12 to 0.16mol/l of Ni<2+>, 0.1 to 0.2mol/l of Mg<2+>, 0.1 to 0.15mol/l of Cl<->, 0.1 to 0.15mol/l of potassium sodium tartrate and 0.1 to 0.15mol/l of F<-> according to a formula; regulating a PH value within 2.5 to 3.5; and phosphating for 20 to 30 minutes at a normal temperature taken as a phosphating temperature. The raw materials do not contain pollutant elements, so that the influences to the environment are reduced; the production process is simple; the total acidity and the free acid strength of the phosphating liquid and the treatment time of the steel tube are controlled in the phosphating process, so that a phosphating film on the surface of the steel tube is uniform in thickness, strong in corrosion resistance and rapid in film forming speed. The phosphating process is low in cost, good in economic benefit and suitable for large-scale industrial production. The molybdates are adopted, so that the functions of passivation and catalysis are exerted. The phosphating process is easy to adjust, stable and less in deposited residue, can be used for rapidly forming the dense phosphating film, and is obvious in effect and cannot generate side effects.

Description

technical field [0001] The invention relates to the technical field of special-shaped steel pipes, in particular to a surface phosphating process for special-shaped steel pipes. Background technique [0002] Special-shaped steel pipe is a long strip of steel with a hollow section, widely used in automobiles, trains, airplanes, ships and space launchers and other structural components, mechanical parts, petrochemical, geological drilling, textile machinery, radio communications, medical and health, Completion and other fields. The use of special-shaped steel pipes to manufacture ring parts can improve the utilization rate of materials, simplify the manufacturing process, and save materials and processing hours. [0003] The phosphating process is a process in which chemical and electrochemical reactions form a phosphate chemical conversion film, and the formed phosphate conversion film is called a phosphating film. The phosphating film has a microporous structure, and after...

Claims

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Application Information

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IPC IPC(8): C23C22/22
Inventor 郭洪建杨日升
Owner 张家港市华尊宝特种材料科技有限公司
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