Hot dip galvanizing technique for implementing corrosion resistance and rust resistance of steel tube

An anti-corrosion and anti-rust, hot-dip galvanizing technology, applied in hot-dip galvanizing process, metal material coating process, coating, etc., can solve problems such as cold galvanizing and rusting, and achieve durability and reliability, avoid time, and reliability Good results

Inactive Publication Date: 2015-02-04
NANTONG HENGTE TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The cold galvanizing process is used to protect the metal from corrosion. For this purpose, the coating of zinc filler is used, and then it is coated on the surface of the protected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Hoist 2 tons of steel pipes with clean surface treatment into the dilute hydrochloric acid pool with a concentration of 20% for pickling for 5 minutes. The steel pipes should be vibrated frequently during pickling. Start the sling on one side repeatedly 3 times, then start the sling on the other side 3 times, and then hoist after repeating twice. The rising angle of vibration is not more than 15°; All the steel pipes are submerged in water, loosen the pickling sling, and lift it up and down three to four times; after washing, control the water in the steel pipe, and enter the plating flux for treatment as soon as possible to prevent the steel pipe from being oxidized. Relax until the steel pipe is completely immersed in the solvent, and the surface of the steel pipe is not allowed to be exposed to the solvent surface. The soaking time is 1min, or until there are no bubbles at both ends of the steel pipe, then lift one side of the steel pipe to vibrate up and down, lift t...

Embodiment 2

[0020] Hoist 2 tons of steel pipes with clean surface treatment into the dilute hydrochloric acid pool with a concentration of 19% for pickling for 10 minutes. The steel pipes should be vibrated frequently during pickling. Start the sling on one side repeatedly 3 times, then start the sling on the other side 3 times, and then hoist after repeating twice. The rising angle of vibration is not more than 15°; All the steel pipes are submerged in water, loosen the pickling sling, and lift it up and down three to four times; after washing, control the water in the steel pipe, and enter the plating flux for treatment as soon as possible to prevent the steel pipe from being oxidized. Relax until the steel pipe is fully immersed in the solvent, and the surface of the steel pipe is not allowed to be exposed to the solvent surface. The soaking time is 1.5 minutes, or until there are no bubbles at both ends of the steel pipe, and then lift one side of the steel pipe to vibrate up and down....

Embodiment 3

[0022] Hoist 2 tons of steel pipes with clean surface treatment into the dilute hydrochloric acid pool with a concentration of 18% for pickling for 15 minutes. The steel pipes should be vibrated frequently during pickling. Start the sling on one side repeatedly 3 times, then start the sling on the other side 3 times, and then hoist after repeating twice. The rising angle of vibration is not more than 15°; All the steel pipes are submerged in water, loosen the pickling sling, and lift it up and down three to four times; after washing, control the water in the steel pipe, and enter the plating flux for treatment as soon as possible to prevent the steel pipe from being oxidized. Relax until the steel pipe is fully immersed in the solvent, and the surface of the steel pipe is not allowed to be exposed to the solvent surface. The soaking time is 2 minutes, or until there are no bubbles at both ends of the steel pipe, and then lift one side of the steel pipe to vibrate up and down, l...

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PUM

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Abstract

The invention discloses a hot dip galvanizing technique for implementing corrosion resistance and rust resistance of a steel tube. The technical scheme is as follows: the hot dip galvanizing technique comprises the following steps: steel tube pretreatment, acid washing, water washing, assisted plating, drying, galvanizing, internal and external blowing, passivation, inspection and packaging. The technique has the following advantages: 1. low treatment cost: the rust resistance cost by hot dip galvanizing is lower than that of other paint coatings; 2. high durability: in a suburb environment, the standard hot galvanizing rust-resistant coating can keep effective for more than 50 years without repair; in urban districts or offshore areas, the standard hot-galvanizing rust-resistant coating can keep effective for more than 20 years without repair; 3. high reliability: the galvanizing coating is metallurgically bonded with the steel to become part of the steel surface, and therefore, the durability of the coating is reliable; and 4. high coating toughness: the galvanizing coating forms a special metallurgical structure capable of bearing mechanical damage in the transportation and use process.

Description

technical field [0001] The invention relates to the technical field of hot-dip galvanizing, in particular to a hot-dip galvanizing process for preventing corrosion and rust of steel pipes. Background technique [0002] The cold galvanizing process is used to protect the metal from corrosion. For this purpose, the coating of zinc filler is used, and then it is coated on the surface of the protected component by a coating method. After drying, a zinc filler coating is formed. In the dry coating The zinc content in the steel reaches 95%, but cold galvanizing generally rusts within half a year. [0003] Usually the thickness of the electro-galvanized layer is 5-15 μm, while the thickness of the hot-dip galvanized layer is generally above 35 μm, even as high as 200 μm. Hot-dip galvanizing has good coverage, dense coating, and no organic inclusions. As we all know, the mechanism of zinc’s anti-atmospheric corrosion includes mechanical protection and electrochemical protection. U...

Claims

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Application Information

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IPC IPC(8): C23C2/38C23C2/06
CPCC23C2/38C23C2/06
Inventor 吴爱国
Owner NANTONG HENGTE TUBE
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