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Phosphating solution for corrosion prevention of iron towers and preparation method thereof

A phosphating solution and iron tower technology, applied in the coating process of metal materials, etc., can solve problems such as affecting adhesion and whitening

Inactive Publication Date: 2013-05-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rust layer transformation usually uses phosphating solution to clean the surface and then phosphating. However, the current phosphating film will turn white under strong sunlight for a long time, which will affect the adhesion. It is necessary to paint at least 16 hours after the phosphating film is dry. A primer, restricting its application

Method used

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  • Phosphating solution for corrosion prevention of iron towers and preparation method thereof
  • Phosphating solution for corrosion prevention of iron towers and preparation method thereof
  • Phosphating solution for corrosion prevention of iron towers and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 Phosphating solution composition primary selection single factor experiment of the present invention

[0044] The on-site process requires that the phosphating solution used should be able to quickly form a film (rust layer conversion, zinc layer phosphating) at room temperature, and the rust removal and phosphating process can be completed in one step. At the beginning of the development process, H 3 PO 4 , ZnO, H 2O is the base solution, and different accelerators and chelating agents are added to prepare different phosphating solutions, and single-factor variable experiments are performed to determine the appropriate additives and dosage one by one. Observe the color of the conversion coating on the rust layer and the phosphating coating on the zinc layer and the ash on the surface. The conversion coating on the rust layer should be black, the phosphating coating on the zinc layer should be dark gray, and there should be no ash on the surface of the tw...

Embodiment 2

[0055] Embodiment 2 Phosphating solution orthogonal experiment of the present invention

[0056] According to the results obtained from the single factor experiment, an orthogonal design table was established, and seven factors and three levels were selected to do the orthogonal experiment, and the copper sulfate spot test was used as a method to quickly test the corrosion resistance of the rust conversion coating, with its corrosion resistance as the main Index, with the film weight of the phosphating film on the zinc layer as a reference, determine the optimal reagent dosage. Orthogonal experiment table and experimental results are shown in Table 1.

[0057] Table 1 Orthogonal experiment table and experimental results

[0058]

[0059] Graphics can be used to intuitively describe the relationship between factor levels and indicators. When drawing, the abscissa takes the actual value of each factor level, and the ordinate takes the mean value corresponding to this factor ...

Embodiment 3

[0076] Embodiment 3 Phosphating solution single factor variable experiment of the present invention

[0077] In order to further clarify the influence of each component of the phosphating solution on the phosphating performance, a single factor variable experiment of the phosphating solution was done, and the influence of each component on the performance of the phosphating solution was obtained as follows:

[0078] (1) Phosphoric acid. Phosphoric acid is a non-volatile non-oxidizing weak acid with triple ionization, which is graded ionized in aqueous solution and is the main component of phosphating solution. When phosphoric acid is in contact with the rust layer and zinc layer, three types of phosphates can be generated: ferrous, iron and zinc normal salt, hydrogen salt, and dihydrogen salt. Hydrogen phosphate and phosphate are insoluble and form a film layer, while dihydrogen phosphate quickly converts into two types of phosphates, hydrogen salt and normal salt, and enters...

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Abstract

The invention discloses a phosphating solution for corrosion prevention of iron towers and a preparation method thereof. The phosphating solution is prepared by using the following raw materials: 180-185 ml / L of phosphoric acid, 60-65 ml / L of ethanol, 3.0-3.5 ml / L of OP-10, 5.0-6.5 g / L of zinc oxide, 1.5-2.0 g / L of CUT-052, 2.5-3.5 g / L of nickel nitrate, 10.0-14.0 ml / L of NCE-C01, 1.5-2.0 g / L of sodium chlorate, and 1.5-2.0 g / L of NaF. According to the invention, operations of cleaning, rust-layer transformation, zinc-layer phosphorization and surface adjustment can be completed in one step; and the phosphating solution carries out rusty phosphorization and rust-layer transformation on iron towers, the construction process is simple, and the corrosion prevention effect is good.

Description

technical field [0001] The invention relates to a phosphating solution and a preparation method thereof, in particular to a phosphating solution used for anticorrosion of power line iron towers and a preparation method thereof. Background technique [0002] The iron tower of the transmission line is made of hot-dip galvanized ordinary carbon steel. During its operation, part of the hot-dip galvanized surface is corroded. In severe cases, the galvanized layer is completely corroded and damaged, which endangers the safe operation of the transmission line. Therefore, the corroded transmission tower needs regular anti-corrosion coating treatment. The traditional surface treatment methods are manual rust removal or pickling and then painting. Manual derusting or pickling not only destroys the zinc layer, the protective layer on the surface of the iron tower, but also causes environmental pollution. Both methods are difficult to completely remove rust, and are easy to rust and w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/36
Inventor 陈颖敏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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