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
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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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