All-chemical anticorrosive treatment method for high-tension transmission line iron tower

A high-voltage transmission line, chemical anti-corrosion technology, applied in the field of transmission tower anti-corrosion, can solve the problems of iron tower construction difficulties, etc., achieve the effect of good effect, applicable process operation and reasonable formula

Inactive Publication Date: 2015-04-29

STATE GRID CORP OF CHINA +1

2 Cites 8 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, this kind of technology is more beneficial to large-area metal construction, but it w...

Method used

(2) use hydrochloric acid pickling liquid to remove rust to high-voltage transmission line iron tower bottom; The rust on metal surface is mainly the oxide compound (Fe3O4, Fe2O3, FeO) of iron for iron and steel, and iron and steel contact with acid and can remove iron and steel surface of rust. Pickling solution can be selected hydroc...

Abstract

The invention relates to an all-chemical anticorrosive treatment method for a high-tension transmission line iron tower. The method comprises the following steps: (1) removing metal surface oil stains by using a surfactant; (2) removing rust from the lower part of the high-tension transmission line iron tower by using chlorohydric acid pickling solution; (3) removing rust from the upper part of the high-tension transmission line iron tower by using pickling passivation paste; (4) brushing the iron and steel surface with alkaline oxidation liquid, and performing chemical conversion treatment on the iron and steel surface; (5) brushing the iron and steel surface subjected to chemical conversion treatment with epoxy zinc rich primer; (6) brushing the iron and steel surface brushed with the epoxy zinc rich primer by using epoxy mica iron intermediate coat; and (7) brushing the iron and steel surface brushed with the epoxy mica iron intermediate coat by using epoxy resin finish. According to the method disclosed by the invention, each formula ingredient is reasonable, the process operation is applicable, the working efficiency is improved, and the effect is good.

Application Domain

Metallic material coating processes

Technology Topic

Transmission lineMetal +12

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Examples

Experimental program(1)

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[0033] The implementation of the present invention is described in further detail below. The following examples are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited by this.

[0034] A full chemical anticorrosive treatment method for high-voltage transmission line towers, the steps of the method include:

[0035] (1) Use surfactants to remove oil stains on the metal surface; for metal parts to be treated, only the oil stains and rust on the metal surface can be firmly combined with the metal after the paint layer is removed. Pickling and rust removal can remove steel rust. But when there is oil on the metal surface, it will isolate the pickling solution from contact with rust and fail to achieve the purpose of pickling and rust removal. Therefore, if there is grease on the metal surface, the oil should be removed first. In the past, the use of organic solvents or lye for degreasing was unsafe, inconvenient and polluted the environment; surfactants used for cleaning have good effects, especially nonionic surfactants, which have strong degreasing ability and can replace organic solvents such as gasoline. Due to the advantages of low use temperature, less foam, certain anti-rust ability, non-corrosive metal, harmless to human body, and safe use, the formula of the non-ionic surfactant determined by the present invention is as follows:

[0036] Formula 1, the content of each component substance per liter of aqueous solution is:

[0037] Polyoxyethylene fatty alcohol ether: 20~25g/L

[0038] Trisodium phosphate: 30~50g/L;

[0039] Formulation 2, a degreasing formulation containing anionic surfactants, the content of each component substance per liter of aqueous solution is:

[0040] 664 detergent: 10~15g/L

[0041] 105 detergent: 10~15g/L

[0042] Sodium hydroxide: 30~50g/L;

[0043] The working temperature of the above two formulas is 60~80℃, and the treatment time is 3~5min. After the metal surface is degreasing with the above surfactant, thoroughly rinse the metal surface with water to remove the metal surface residue;

[0044] (2) Use hydrochloric acid pickling solution to remove rust from the lower part of the high-voltage transmission line tower; the rust on the metal surface is mainly iron oxide (Fe 3 O 4 , Fe 2 O 3 , FeO), steel and acid contact can remove rust on the surface of steel. The pickling liquid can be hydrochloric acid, sulfuric acid, and nitric acid, but hydrochloric acid has strong rust removal ability, fast dissolution of rust, and low price. The hydrochloric acid pickling liquid is used as the rust removal liquid in the method of the present invention. The quality of the hydrochloric acid pickling liquid The percentage formula is:

[0045] Hydrochloric acid: 3%~7%

[0046] Corrosion inhibitor (Urotropine): 0.3%

[0047] Water: 93%~97%;

[0048] The treatment time is limited to the removal of rust; after rust removal with hydrochloric acid pickling solution, the residual acid and reaction products on the metal are rinsed with clean water;

[0049] (3) Use pickling passivation paste to remove rust on the upper part of the high-voltage transmission line iron tower; for the upper part of the iron tower, it is difficult and unsafe to apply hydrochloric acid pickling solution to the upper part of the iron tower. Acid can be used to remove the rust on the upper metal parts of the iron tower. The washing paste removes rust, and still can get a good rust removal effect. The formula of the pickling passivation paste determined by the present invention contains the following components in parts by weight ratio:

[0050]

[0051] Apply the pickling passivation paste to the cleaned surface with a thickness of 1mm~3mm. The time is based on the removal of the rust. For re-embroidering, the paste can be applied several times; after removing the rust, use clean water to remove the residue Rinse clean, after using pickling passivation paste to remove rust, the steel metal surface can be treated without chemical conversion;

[0052] (4) Use alkaline oxidizing solution to paint the surface of steel and chemical conversion treatment on the surface of steel; the specific alkaline oxidizing solution is: an aqueous solution containing 2% to 5% of sodium hydroxide and 15% of sodium nitrite; After the chemical conversion treatment, rinse the residue with clean water. The galvanized iron plate after degreasing, rust removal and chemical conversion treatment is like figure 1 Shown

[0053] (5) Brush coating epoxy zinc-rich primer on the steel surface after chemical conversion treatment;

[0054] (6) Brush the epoxy mica intermediate paint on the steel surface with epoxy zinc-rich primer;

[0055] (7) Apply epoxy top coat to the steel surface with epoxy mica intermediate paint to complete the chemical anti-corrosion treatment of the tower. The treated test piece is coated with three thin layers of primer, middle paint and top coat. After the brushed test piece is placed in saturated steam at room temperature for 30 days, take it out for inspection, such as figure 2 Shown.

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Reasonable formula

All-chemical anticorrosive treatment method for high-tension transmission line iron tower

A high-voltage transmission line, chemical anti-corrosion technology, applied in the field of transmission tower anti-corrosion, can solve the problems of iron tower construction difficulties, etc., achieve the effect of good effect, applicable process operation and reasonable formula

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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