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Corrosion resistant nano coating, corrosion resistant steel and preparation method thereof

A corrosion-resistant, nano-pigment technology, applied in the direction of rails, rails, coatings, etc., can solve the problems of high-carbon rail steel toughness and side effects of welding performance, can not be popularized and applied, splash paint can not be recycled, etc., to achieve easy coating, Facilitate popularization and use, and the effect of coating appearance is smooth and flat

Active Publication Date: 2009-07-29
PANZHIHUA IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. The implementation of the sacrificial protection method is limited by the line. In addition, the current of the sacrificial protection circuit affects the railway signal, and the cost of replacing the consumable sacrificial zinc sheet is high, so it cannot be popularized and applied
[0009] 2. Adding copper, chromium and other alloying elements to the raw steel of the rail can improve the corrosion resistance of the rail, but the cost of the raw steel is high, and the technology of smelting and rolling of the rail steel needs to be greatly improved. The addition of chromium has side effects on the toughness and welding performance of high-carbon rail steel, which reduces the safety of rail use, so it has not been popularized
Thermal spraying requires 8 main processes including sand blasting and rust removal, dust removal, thermal spraying, cooling, organic coating spraying, drying, organic coating spraying, and drying. The process is long and cumbersome
[0014] In addition, "A production process for corrosion-resistant coated steel rails" (Chinese application date: May 26, 2003, patent number ZL03117936.3) uses coatings such as zinc-rich, zinc-rich aluminum, and aluminum-zinc rich coatings. The production process is long, the floor area is large, and the sprayed splash paint cannot be recycled and forms certain pollutants, which brings about the problem of high processing costs
Zinc-rich, zinc-rich aluminum, aluminum-zinc and other coatings have good moisture resistance and salt spray resistance. However, since zinc, zinc-aluminum, and aluminum-zinc are amphoteric metals, they can react with both acid and alkali. Under aggressive conditions, the 75 micron coating has a short retention time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 Inorganic nano coating preparation of the present invention

[0055] Preparation:

[0056] a. Take the following components by weight percentage: 20% aluminum dihydrogen phosphate, nano-sized TiO 2 3%, sodium molybdate 5%, sodium hexametaphosphate 2%, deionized water 70%;

[0057] b. Add aluminum dihydrogen phosphate into water and fully dissolve;

[0058] C, sodium molybdate is added in the solution of step b, fully stirs;

[0059] d, adding nanoscale TiO to the mixture obtained in step c 2 Nano-pigments to make them evenly dispersed;

[0060] e. Add sodium hexametaphosphate to the mixture obtained in step d, stir and disperse for 30 minutes, subpackage, and store. Inorganic nano coating a of the present invention is obtained.

Embodiment 2

[0061] Embodiment 2 Inorganic coating of the present invention and preparation of steel rail

[0062] Preparation:

[0063] 1. Raw material percentages by weight of inorganic nano-coating: aluminum dihydrogen phosphate 60%, nano-sized ZnO 8%, potassium hexafluorozirconate 15%, sodium hexametaphosphate 4%, deionized water 13%.

[0064] a, get the following components by weight percentage: 60% aluminum dihydrogen phosphate, 8% nano-sized ZnO, 15% potassium hexafluorozirconate, 4% sodium hexametaphosphate, 13% deionized water;

[0065] b. Add aluminum dihydrogen phosphate into water and fully dissolve;

[0066] c. Potassium hexafluorozirconate is added to the solution in step b, and fully stirred;

[0067] d, adding nano-scale ZnO to the mixture obtained in step c to make it uniformly dispersed;

[0068] e. Add sodium hexametaphosphate to the mixture obtained in step d, stir and disperse for 20 minutes, subpackage, and store. Inorganic nano-coating b of the present invention ...

Embodiment 3

[0069] Embodiment 3 Preparation of Inorganic Coatings of the Present Invention

[0070] Preparation:

[0071] a. Take the following components by weight percentage: 35% aluminum dihydrogen phosphate and aluminum dihydrogen tripolyphosphate with a weight ratio of 1:1, nano-sized SiO 2 5%, chromium nitrate 5%, sodium tripolyphosphate 3%, deionized water 52%;

[0072] b. Add aluminum dihydrogen phosphate and aluminum dihydrogen tripolyphosphate into water and fully dissolve;

[0073] C, chromium nitrate is added in the solution of step b, fully stirs;

[0074] d, adding nano-scale SiO to the mixture obtained in step c 2 , to make it evenly dispersed;

[0075] e. Add sodium tripolyphosphate to the mixture obtained in step d, stir and disperse for 15 minutes, subpackage, and store. Inorganic nano coating c of the present invention is obtained.

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Abstract

The present invention belongs to the field of iron and steel surface treating technology, and is especially one kind of nanometer anticorrosive paint, its preparation process and steel rail coated with the paint. The nanometer inorganic paint consists of filming material 20-60 wt%, nanometer pigment 3-8 wt%, antirust assistant 5-15 wt%, other assistants 0.025-4 wt%, and deionized water 30-70 wt%. The nanometer inorganic paint has excellent painting performance, high mechanical strength, high anticorrosive performance, high weather resistance, capacity of forming thin smooth coating with certain conducting performance, and other advantages.

Description

technical field [0001] The invention belongs to the field of steel surface treatment, and in particular relates to a corrosion-resistant nano-coating, a steel rail prepared by coating with the coating, and a preparation method thereof. Background technique [0002] With the application of high-strength rails, rail corrosion has become one of the most important factors affecting the service life of rails. [0003] At present, there is no well-formed technology that can be applied industrially to improve the corrosion resistance of steel rails. Only some technical discussions and attempts have been made, including: [0004] (1) Use the sacrificial protection method to improve the corrosion resistance of rails; [0005] (2) Add copper, chromium and other alloying elements to the raw steel of the rail to improve the corrosion resistance of the rail: [0006] (3) The surface of the rail is thermally sprayed with alloy coatings such as aluminum and zinc to improve the corrosion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00E01B5/02
Inventor 田冰梅东生徐权邹明张勇刚马建权
Owner PANZHIHUA IRON AND STEEL