Anti-corrosion treatment method for steel structure iron tower resistant to ocean climate

A technology for anti-corrosion treatment and steel structure, applied in metal material coating process, coating, melting spray plating, etc., can solve the problems of cracking and falling off, crevice corrosion, and unrepairable passive film.

Inactive Publication Date: 2021-05-07
JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the erosion of seawater, fog, sea breeze, temperature changes, and the influence of sunlight, the paint film will accelerate the loss of gloss, pulverization, and even cracking and falling off. The long-term presence of chloride ions will promote corrosion reactions and accelerate the corrosion rate. Corrosion begins with pitting crevices, or corrosion on con...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Base surface cleaning

[0018] The steel structure iron tower is firstly treated with surface purification, and then sand blasted to remove rust. During sand blasting, the nozzle diameter of the spray gun is 8mm, and the sandblasting abrasive is cold-shocked steel grit. The grain size composition of the cold-shocked steel grit is: coarse abrasive 15% , Fine abrasive: 0.5-1mm accounts for 35%, 1-2mm accounts for 50%;

[0019] (2) steel tower anticorrosion

[0020] Within 8 hours of sandblasting and derusting, the iron tower of the steel structure is anti-corrosion treated by arc spraying zinc-aluminum anti-corrosion coating, and the aluminum content in the zinc-aluminum coating is 8.8%;

[0021] The distance between the spray gun and the surface of the substrate is controlled at 150-180mm, the spraying angle is controlled at 60 degrees, the working current of the spraying equipment is 300A, the working voltage of the spraying is 30V, and the thickness of the arc spr...

Embodiment 2

[0023] (1) Base surface cleaning

[0024] The steel structure iron tower is firstly treated with surface purification, and then sand blasted for rust removal. When sand blasting for rust removal, the nozzle diameter of the spray gun is 12mm, and the blasting abrasive is cold shock steel grit. The grain size composition of cold shock steel grit is: coarse abrasive 10% , Fine abrasive: 0.5-1mm accounts for 40%, 1-2mm accounts for 50%;

[0025] (2) steel tower anticorrosion

[0026] Within 8 hours of sand blasting and derusting, the iron tower of the steel structure is anti-corrosion treated by arc spraying zinc-aluminum anti-corrosion coating, and the aluminum content in the zinc-aluminum coating is 9.2%;

[0027] The distance between the spray gun and the surface of the substrate is controlled at 150-180mm, the spraying angle is controlled at 60 degrees, the working current of the spraying equipment is 600A, the working voltage of the spraying is 20V, and the coating thickness...

Embodiment 3

[0029] (1) Base surface cleaning

[0030] The steel structure iron tower is firstly treated with surface purification, and then sand blasted to remove rust. During sand blasting, the nozzle diameter of the spray gun is 10mm, and the sandblasting abrasive is cold shock steel grit. The grain size composition of cold shock steel grit is: coarse abrasive 12% , Fine abrasive: 0.5-1mm accounts for 38%, 1-2mm accounts for 50%;

[0031] (2) steel tower anticorrosion

[0032] Within 8 hours of sand blasting and derusting, the iron tower of the steel structure is treated by arc spraying zinc-aluminum anti-corrosion coating, and the aluminum content in the zinc-aluminum coating is 9%;

[0033] The distance between the spray gun and the surface of the substrate is controlled at 150-180mm, the spraying angle is controlled at 75 degrees, the working current of the spraying equipment is 500A, the working voltage of the spraying is 25V, and the thickness of the arc sprayed steel structure co...

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PUM

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Abstract

The invention discloses an anti-corrosion treatment method for a steel structure iron tower resistant to ocean climate. The method comprises the steps that firstly, surface purification treatment and sand blasting rust removal are conducted on the steel structure iron tower; then, the steel structure iron tower is subjected to anti-corrosion treatment in the mode that a zinc-aluminum anti-corrosion coating is sprayed in an electric arc mode within 8h of sand blasting rust removal, and the aluminum content in a zinc-aluminum coating is 8.8%-9.2%; and a distance between a spray gun and the surface of a base body is controlled to be 150 mm-180 mm, a spraying angle is controlled to be 60 degrees-75 degrees, a working current of spraying equipment is 300 A-600 A, a spraying working voltage is 20 V-30 V, and the thickness of the electric arc spraying steel structure coating is 150 microns-200 microns. The method has the advantages that the electric arc spraying zinc-aluminum coating is good in film-forming property and strong in adhesive force, the steel structure iron tower is long in service life in a marine environment and high in acid and alkali resistance and corrosion resistance, existence of coating pinholes can be avoided, coating hardness is high, abrasion and impact resistance are achieved, acid and alkali aging time is long and an anti-corrosion effect on the steel structure iron tower is achieved.

Description

technical field [0001] The invention relates to an anticorrosion treatment method of a steel structure iron tower resistant to marine climate. Background technique [0002] With the continuous development of power grid construction and the wide-scale use of steel structure towers, the corrosion resistance of steel structure towers in coastal areas has become the main problem in the application of steel structure towers. Due to the erosion of seawater, fog, sea breeze, temperature changes, and the influence of sunlight, the paint film will accelerate the loss of gloss, pulverization, and even cracking and falling off. The long-term presence of chloride ions will promote corrosion reactions and accelerate the corrosion rate. Corrosion begins with pitting crevices or corroding concave surfaces, making the damaged passivation film irreparable. Therefore, the corrosion continues to deepen until the metal is destroyed by dendritic cracks. In addition, it has strong penetrability ...

Claims

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Application Information

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IPC IPC(8): C23C4/131C23C4/08C23C4/02B24C1/08
CPCC23C4/131C23C4/08C23C4/02B24C1/086
Inventor 邱芳
Owner JINZHOU ELECTRIC POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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