CN202558938U - Anti-corrosion power transmission iron tower angle steel and anti-corrosion power transmission iron tower steel tube - Google Patents

Abstract

The utility model relates to an anti-corrosion transmission tower angle steel and a steel pipe, in which a layer of electroless nickel-phosphorus coating is coated on the entire outer periphery of the angle steel base; The thickness of the electroless nickel-phosphorus coating is 20-50 microns. The prepared anti-corrosion transmission tower angle steel and steel pipe have bright and dense surfaces, and the coating is closely combined with the steel substrate, so that the surface of the carbon steel substrate improves its corrosion resistance by electroless Ni-P coating.

Description

An anti-corrosion power transmission tower angle steel and steel pipe

Technical field:

The utility model relates to an anti-corrosion power transmission iron tower angle steel and a steel pipe, belonging to the technical field of power transmission anti-corrosion.

Background technique:

The transmission tower is an important support for power transmission. In recent years, the progress of the power industry has greatly increased the use of transmission towers, and higher requirements have been placed on their ability to withstand loads and prevent corrosion. Since iron and steel materials are easy to corrode and rust in the atmospheric environment and cause component damage, it is necessary to use surface technology to prepare corrosion-resistant coatings to improve the corrosion resistance of components, so as to meet the purpose of long-term service in the atmospheric environment. At present, the angle steel and steel pipe parts of the transmission tower are produced by hot-dip galvanizing, and the galvanized parts are assembled at the construction site to form the final tower. However, the hot-dip galvanizing process requires high temperature conditions, and the zinc vapor generated during the process will also bring great harm to the operators and the surrounding environment. In terms of corrosion resistance mechanism, this type of protection belongs to the protection mechanism of sacrificial anodes, and has a good anti-corrosion effect in environments where electrochemical corrosion solutions are easily formed. Zinc angle steel and steel pipe will face the problem of premature failure, and it is difficult to meet the requirements of service life. Therefore, it is urgent to develop a coating system with better corrosion resistance.

Invention content:

The purpose of the utility model is to overcome the deficiencies in the prior art, and provide a kind of anti-corrosion transmission tower angle steel and steel pipe, improve the environmental protection of the surface treatment process of the transmission tower, improve the corrosion resistance of the coating, prolong its service life, and improve the quality of the transmission tower. Safety and reliability.

The technical scheme that the utility model takes is:

An anti-corrosion power transmission tower angle steel and a steel pipe are coated with a layer of electroless nickel-phosphorus coating on the entire outer periphery of the angle steel substrate;

The thickness of the electroless nickel-phosphorus coating is 20-50 microns, and the mass content of phosphorus in the electroless nickel-phosphorus coating is 6-12%.

The prepared anti-corrosion transmission tower angle steel and steel pipe have bright and dense surfaces, and the coating is closely combined with the steel substrate. The fitting results of the polarization curves of Q235 steel and Ni-P coating show that the self-corrosion potential of Q235 is -1.0182V , the self-corrosion current density is 5.0481E-5A/cm ² ; the self-corrosion potential of the Ni-P coating is -0.41173V, and the self-corrosion current density is 8.3611E-6A/cm ² . It can be seen that the self-corrosion rate of Ni-P coating is significantly lower than that of Q235 steel, indicating that its corrosion resistance is significantly better than that of Q235 steel. This shows that the corrosion resistance of the substrate can be improved by electroless NiP coating on the surface of the Q235 steel substrate.

Description of drawings

Fig. 1 is the utility model anti-corrosion power transmission tower angle steel structural diagram;

Fig. 2 is the structural diagram of the utility model anti-corrosion transmission tower steel pipe;

Among them, 1. Angle steel substrate, 2. Steel pipe substrate, 3. Electroless nickel-phosphorous coating.

Detailed ways

Example 1

An anti-corrosion electric transmission tower angle steel, in which a layer of electroless nickel-phosphorus coating 3 is covered on the entire outer periphery of the angle steel substrate 1 .

The thickness of the electroless nickel-phosphorus coating 3 is 20-50 microns, and the mass content of phosphorus in the electroless nickel-phosphorus coating 3 is 6-12%.

The manufacturing process is as follows:

(1) Use a grinder to remove the burrs on the surface of the Q235 angle steel, and use sandpaper to remove dirt.

(2) Use NaOH (30g/L) to carry out alkali cleaning on the angle steel, then use 33% (v/v) hydrochloric acid to carry out pickling and rust removal, 5% (v/v) dilute sulfuric acid to carry out weak acid activation, and finally use deionized water Rinsing of steel angles for coating deposition.

(3) The angle steel is placed in the plating solution for electroless plating. The composition of the plating solution is: nickel sulfate 25g/L, sodium hypophosphite 25g/L, sodium acetate 14g/L, citric acid 6g/L, pH value is 4, and the temperature is 80°C, the electroless plating time is 4h.

Example 2

An anti-corrosion electric transmission tower steel pipe, the inner surface and the outer surface of the steel pipe substrate 2 are coated with a layer of electroless nickel-phosphorus coating 3 respectively.

The thickness of the electroless nickel-phosphorus coating 3 is 20-50 microns, and the mass content of phosphorus in the electroless nickel-phosphorus coating 3 is 6-12%.

The manufacturing process is as follows:

(1) Use a grinder to remove the burrs on the surface of the Q345 steel pipe, and use sandpaper to polish to remove dirt.

(2) Use NaOH (30g/L) to carry out alkali cleaning on the angle steel, then use 33% (v/v) hydrochloric acid to carry out pickling and rust removal, 5% (v/v) dilute sulfuric acid to carry out weak acid activation, and finally use deionized water Rinsing of steel angles for coating deposition.

(3) The steel pipe is placed in the plating solution for electroless plating. The composition of the plating solution is: nickel sulfate 25g/L, sodium hypophosphite 25g/L, sodium acetate 14g/L, citric acid 6g/L, pH value is 5, and the temperature is 90°C, electroless plating time is 4h.

Claims (3)

1. a protection against corrosion electric power pylon angle steel, steel pipe is characterized in that, are covered with one deck chemical nickel plating phosphor coating in whole peripheries of angle steel matrix; Internal surface and outside surface at the steel pipe matrix are covered with one deck chemical nickel plating phosphor coating respectively.

2. a kind of protection against corrosion electric power pylon angle steel according to claim 1, steel pipe is characterized in that described chemical nickel phosphorus plating coat-thickness is at the 20-50 micron.

3. a kind of protection against corrosion electric power pylon angle steel according to claim 1, steel pipe is characterized in that the mass content of phosphorus is 6-12% in the described chemical nickel plating phosphor coating.

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