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Pipe fitting with double galvanized layers and manufacturing method thereof

A manufacturing method and technology for pipe fittings, applied in the coating of superimposed layers, pipes/pipe joints/pipe fittings, coatings, etc., can solve the problems of thin coatings, impact resistance, corrosion resistance, etc., and can not meet the requirements, so as to achieve a bright color of the zinc layer Beautiful appearance, improved reputation and uniform zinc layer

Inactive Publication Date: 2013-03-27
JINAN MEIDE CASTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the thin coating, its impact resistance and corrosion resistance cannot meet the requirements.

Method used

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  • Pipe fitting with double galvanized layers and manufacturing method thereof
  • Pipe fitting with double galvanized layers and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, a pipe fitting with double coating, is characterized in that: the pipe fitting 1 made of malleable steel has a layer of hot-dip galvanized layer 2 on the inner and outer surfaces, and a layer of electro-galvanized layer 3 on the outside of the hot-dip galvanized layer, and the surface of the threaded part has only one layer Galvanized layer.

Embodiment 2

[0019] Embodiment 2, a method for manufacturing pipe fittings with double coatings, comprising the following steps: A. hot-dip galvanizing, including several processes of drying → galvanizing → galvanizing → cleaning → cooling, B. thread processing, C. electroplating Zinc, including the following steps: chemical degreasing or thermal degreasing → water washing → electrolytic degreasing → water washing → pickling → water washing → hydrochloric acid water washing → water washing → electrogalvanizing → water washing → hydrochloric acid water washing → water washing → passivation → water washing after passivation → passivation Second washing after melting→hot air drying→quality inspection.

[0020] The method of hot-dip galvanizing is as follows: a. For drying, the castings should be placed on the drying net to be turned and flattened at any time, so that the castings can be heated evenly and dried quickly; the baked castings should be preheated or loaded immediately Cage, b. Zinc...

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Abstract

The invention discloses a pipe fitting with double galvanized layers and a manufacturing method thereof, belongs to pipeline connecting pieces for pipeline connection, and particularly relates to the pipeline connecting pieces which are subjected to surface treatment by using hot galvanizing and electro-galvanizing. The pipe fitting is characterized in that each of the internal and external surfaces of the pipe fitting made from malleable iron is provided with a hot-galvanized layer, an electro-galvanized layer is formed outside the hot-galvanized layer, and the surface of a threaded section of the pipe fitting is only provided with the electro-galvanized layer. The pipe fitting with the double galvanized layers and the manufacturing method of the pipe fitting with the double galvanized layers have the beneficial effects that zinc layers are bright and beautiful in color after the zinc layers, electro-galvanized after the hot galvanizing, are subjected to passivating treatment; the electro-galvanizing, after the hot galvanizing, is carried out after the pipe fitting is subjected to weak erosion in acidic liquid, i.e., zinc ions are deposited on the hot-galvanized layers, through electro-galvanizing treatment, the thickness of the zinc layers can be increased by 12-20 microns, and the corrosion resistance of the zinc layers is improved; proved by neutral salt spray tests, through electro-galvanizing retreatment, the corrosion resistance of the zinc layers is obviously improved; and proved by copper sulfate tests, the corrosion resistance of the zinc layers is increased by over one time.

Description

technical field [0001] The invention belongs to a pipeline connection piece used for pipeline connection, in particular to a pipeline connection piece with hot-dip galvanizing and electro-galvanizing for surface treatment. Background technique [0002] Pipeline connectors are widely used in industrial production and people's life. Some general pipe fittings are used directly after finishing the cast malleable steel parts. A large number of processed pipe fittings are surface treated by hot-dip galvanizing. The galvanized coating is thicker and can be divided into iron base, alloy layer and pure zinc layer from the inside to the outside. Due to the existence of the zinc-iron alloy layer, it has strong corrosion resistance that cannot be compared with electro-galvanizing. Therefore, this plating method is especially suitable. It can be used in strong corrosive environments such as various strong acids and alkali mist, but the brightness and corrosion resistance of pipe fitting...

Claims

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Application Information

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IPC IPC(8): F16L58/08C23C28/02
Inventor 臧桂铭任德峰刘传山孙允月
Owner JINAN MEIDE CASTING CO LTD
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