Long-life anti-corrosive layer for transmission tower and method for making same

A transmission pole tower, long-life technology, applied in anti-corrosion coatings, chemical instruments and methods, towers, etc., can solve the problems of mechanical straightening of steel pipe poles, reduced anti-corrosion effect of thermal sprayed zinc layer, and reduced anti-corrosion performance. Economic and social benefits, elimination of three wastes pollution, good impact resistance

Active Publication Date: 2010-06-09
辽宁万事达电力股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hot-dip galvanizing is a widely used traditional anti-corrosion process with good anti-corrosion effect, but it will cause thermal deformation when used in steel pipe towers for power transmission: steel pipe rods are usually made into conical multi-edged hollow cylinders, which are easily damaged after hot-dip galvanizing. Deformation, due to the irregular shape and different top and bottom, mechanical straightening cannot be c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] After blanking, shot blasting, pressing, zinc spraying, seam forming, welding, grinding, and secondary sandblasting, the transmission tower rods are subjected to anti-corrosion treatment according to the following steps:

[0047] 1) The bottom layer of thermal sprayed zinc is arc sprayed with pure zinc wire, with a zinc content of 99.99%; the thickness of the zinc sprayed layer is 100 μm, and the requirements for bonding with the substrate are: no falling off by cross-cut method, no cracking by hammering method;

[0048] 2) The epoxy zinc-rich heavy-duty anti-corrosion sealing intermediate layer is implemented immediately after the end of step 1). The coating composition is: 15% epoxy resin, 70% ultrafine high-activity flaky zinc powder, 3% curing agent, and 12% solvent. Implemented with a high-pressure airless sprayer, with a pressure of 20Mps, a viscosity of 60 seconds, a wet film thickness of 40μm, and a dry film thickness of 20μm;

[0049]3) The modified acrylic nan...

Embodiment 2

[0051] After blanking, shot blasting, pressing, zinc spraying, seam forming, welding, grinding, and secondary sandblasting, the transmission tower rods are subjected to anti-corrosion treatment according to the following steps:

[0052] 1) The bottom layer of thermal sprayed zinc is arc sprayed with zinc alloy wire, with a zinc content of 95% and an aluminum content of 5%; the thickness of the zinc sprayed layer is 130 μm, and the requirements for bonding with the substrate are: no falling off by cross-cut method, no cracking by hammering method;

[0053] 2) The epoxy zinc-rich heavy-duty anti-corrosion sealing intermediate layer is implemented immediately after the end of step 1). The coating composition is: 14% epoxy resin, 71% ultrafine high-activity flaky zinc powder, 5% curing agent, and 10% solvent. Implemented with a high-pressure airless sprayer, with a pressure of 15Mps, a viscosity of 55 seconds, a wet film thickness of 30μm, and a dry film thickness of 15μm;

[0054...

Embodiment 3

[0056] After blanking, shot blasting, pressing, zinc spraying, seam forming, welding, grinding, and secondary sandblasting, the transmission tower rods are subjected to anti-corrosion treatment according to the following steps:

[0057] 1) The bottom layer of thermal sprayed zinc is arc sprayed with zinc alloy wire, with a zinc content of 97% and an aluminum content of 3%; the thickness of the zinc sprayed layer is 130 μm, and the requirements for bonding with the substrate are: no falling off by cross-cut method, no cracking by hammering method;

[0058] 2) The epoxy zinc-rich heavy-duty anti-corrosion sealing intermediate layer is implemented immediately after step 1). The coating composition is: 15% epoxy resin, 73% ultrafine and highly active flaky zinc powder, 2% curing agent, and 10% solvent. Use a high-pressure airless sprayer, with a pressure of 18Mps, a viscosity of 50 seconds, a wet film thickness of 35 μm, and a dry film thickness of 18 μm;

[0059] 3) The modified ...

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Abstract

The invention relates to a long-life anti-corrosive layer for a transmission tower and a method for making the same. The long-life anti-corrosive layer has a composite structure consisting of metal, non-metal and organic matter, wherein a thermally zinc-sprayed bottom layer is sprayed by electric arc by using zinc alloy; an epoxy zinc-rich heavy anti-corrosion enclosed middle layer comprises epoxy resin, zinc powder, a curing agent and a thinner, and is implemented via a high-pressure airless sprayer; a modified acrylic nano surface layer comprises isocyanate additive, modified acrylic resin, a mixture of pigment and filler, the curing agent and a solvent; and a coating method adopts conventional methods such as a brushing method, a rolling method, a spraying method and the like. The invention has the following beneficial effects that: the epoxy zinc-rich heavy anti-corrosion enclosed middle layer is used to enclose a zinc-sprayed layer instead of chromate, and has excellent anticorrosive property; the technology can replace hot galvanizing, lower the production cost, save energy source, eliminate pollution of the three wastes, and prolong the service life to more than 50 years for primary treatment; and the technology is applicable for the fields of electric power, transportation, chemical industry and the like, and has remarkable economic benefit and social benefit.

Description

technical field [0001] The invention relates to the field of metal material surface anti-corrosion treatment technology, in particular to a long-life anti-corrosion layer for transmission towers and a manufacturing method thereof. Background technique [0002] Transmission towers are special facilities that transmit electricity from power plants (stations) to substations, and then from substations at all levels to users. In order to reduce the loss of electric energy during long-distance transmission (such as thousands of kilometers from west to east in my country), it is usually necessary to boost the electric energy of the power plant (station) to a high-voltage or ultra-high-voltage state. At present, my country's power transmission and distribution level has reached 750kv, and the 1000kv ultra-high voltage transmission and distribution technology has also been tested successfully. With the improvement of power transmission and distribution level, transmission towers are...

Claims

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Application Information

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IPC IPC(8): E04H12/00C09D163/00C09D5/10C09D133/00B32B15/04C23C4/08C23F15/00
Inventor 姚光任孙洪涛任萍张影
Owner 辽宁万事达电力股份有限公司
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