Method for preventing copper pipe welding portion from generating verdigris due to oxidation in air

A technology for welding parts and copper pipes, applied in anti-corrosion coatings, devices for coating liquid on surfaces, special surfaces, etc., can solve problems such as blackening, and achieve the effects of simple construction, prevention of blackening, and strong gloss retention.

Inactive Publication Date: 2018-01-23
JIANGSU TENESUN ELECTRICAL APPLIANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even the existing copper powder paint will be destroyed by harmful substances in the air and gradually turn black after painting

Method used

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  • Method for preventing copper pipe welding portion from generating verdigris due to oxidation in air
  • Method for preventing copper pipe welding portion from generating verdigris due to oxidation in air
  • Method for preventing copper pipe welding portion from generating verdigris due to oxidation in air

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A method for preventing copper tube welding parts from being oxidized in the air to produce patina: cleaning the welding parts with hot water in time after the copper tube welding is completed to remove flux residues. Copper powder (particle size is 100 orders) and appropriate amount of antirust pigment are added in vessel and stirred evenly, then gradually add nitro varnish (25% of copper powder, 10% of antirust pigment, surplus is nitro varnish, described antirust pigment It is composite iron-titanium powder with a particle size of 325 mesh). Adjust the copper powder mixture into a slurry, stir well, and the construction viscosity is 24S. After the surface of the welding part of the copper pipe is dry, first apply 2-3 degrees of shellac paint to seal it, and then apply the prepared copper powder paint 2-3 degrees, and spray polyurethane varnish 2-3 degrees after the surface of the copper powder paint is dry. 3 degrees. At this point, the whole process of preventing ...

Embodiment 2

[0036] A method for preventing copper tube welding parts from being oxidized in the air to produce patina: cleaning the welding parts with hot water in time after the copper tube welding is completed to remove flux residues. Copper powder (particle size is 150 orders) and appropriate amount of antirust pigment are added in vessel and stirred evenly, then gradually add nitro varnish (copper powder 28%, antirust pigment 12%, surplus is nitro varnish, described antirust pigment It is composite iron-titanium powder with a particle size of 325 mesh)). Adjust the copper powder mixture into a slurry, stir well, and the construction viscosity is 26S. After the surface of the welding part of the copper pipe is dry, first apply 2-3 degrees of shellac paint to seal it, and then apply the prepared copper powder paint 2-3 degrees, and spray polyurethane varnish 2-3 degrees after the surface of the copper powder paint is dry. 3 degrees. At this point, the whole process of preventing coppe...

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Abstract

The invention belongs to the technical field of copper pipe welding and particularly relates to a method for preventing the copper pipe welding portion from generating verdigris due to oxidation in air. The method comprises the following steps that (1) after copper pipes are welded, the copper pipe welding portion is washed, after the surface is dried, the welding position is fully coated with shellac for 2-3 times to be closed; anti-rust pigments are added in copper powder and then evenly stirred, then nitrocellulose varnish is added, the volume proportion of the copper powder is 25-30%, thevolume proportion of the anti-rust pigments is 8-12%, the anti-rust pigments are selected from ferrotitanium powder or zinc borate, and a copper powder ixture is sufficiently stirred and then fully smeared on the welding position for 2-3 times; and (3) after the surface of copper powder varnish is solidified and then sprayed with polyurethane varnish for 2-3 times. The invention provides the method for preventing the copper pipe welding portion from generating verdigris due to oxidation in the air and provides the copper powder varnish and construction and configuration methods thereof, the configuration and construction methods are particularly simple, and the phenomenon that the copper powder varnish is blackened can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of copper tube welding, and in particular relates to a method for preventing copper tube welding parts from being oxidized in the air to produce verdigris. Background technique [0002] Copper tube welding is a very important step in the manufacturing process of heat pump water heaters. In order to improve the welding quality of copper pipes, it is necessary to use flux during welding. Flux residues make the soldering part of the copper pipe more likely to be oxidized in the air and produce a patina, which affects the appearance of the whole machine. At present, the method commonly used in the industry is to directly coat the varnish on the welded part, but this method will still produce patina after a period of time. [0003] The welding part of the copper pipe is painted with copper powder paint after cleaning the flux residue, so that the color of the welding part is consistent with the color of the cop...

Claims

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Application Information

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IPC IPC(8): B05D5/00B05D7/00B05D7/14C09D5/10
Inventor 孙永剑王颖王天舒李俊红杨奕
Owner JIANGSU TENESUN ELECTRICAL APPLIANCE
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