Producing process of anticorrosive coated steel rails

A technology of corrosion-resistant coating and production process, which is applied in the direction of metal material coating process, coating, and the device for coating liquid on the surface, etc. It can solve the problems of poor adhesion of corrosion-resistant coatings, achieve firm adhesion, and improve adhesion excellent corrosion resistance

Inactive Publication Date: 2003-11-19
攀枝花钢铁有限责任公司钢铁研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the deficiencies of the existing steel rail chemical degreasing and derusting that easily cause cracks on the steel rail and poor adhesion of the corrosion-resistant coating, the invention provides a cold plating method for the corrosion-resistant coating of the steel rail, that is, the surface of the steel rail is chemically treated first, Then it is covered with zinc-rich coating or aluminum-rich coating or zinc-aluminum coating. The chemical treatment liquid used can not only effectively remove the oil stain and rust layer on the surface of the rail, the rail will not produce cracks, and at the same time it can be used on the rail A chemically treated film layer is formed on the surface to improve the adhesion of the corrosion-resistant coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Transfer the steel rails to the chemical treatment tank. The temperature of the chemical treatment liquid is 35°C. After soaking for 3 minutes under the condition of ultrasonic vibration, the oil stains, rust and phosphating on the surface of the steel rails are removed, and the treated steel rails are sent to the platform at the same time. Leave to stand for 6 minutes.

[0040] The chemical treatment solution contains: phosphoric acid 105g / l, zinc dihydrogen phosphate 75g / l, phytic acid 45g / l, tartaric acid 15g / l, thiourea 7g / l, accelerator 0.8g / l, molybdate 24g / l.

[0041] Then the rail is still conveyed to the spray booth in an inverted form, and 250g of sodium phytate is added to the zinc-rich paint, and a 25-75 micron cold coating is sprayed on the surface of the rail with an airless spraying device.

[0042] Finally, hoisting and stacking complete the storage of steel.

Embodiment 2

[0044] The steel rail is subjected to cold-plating anti-corrosion treatment by the present invention, and the steel rail is routinely transferred to a chemical treatment tank. The temperature of the chemical treatment liquid is 20°C. Under the condition of ultrasonic vibration, soak for 8 minutes to remove oil stains and rust on the surface of the steel rail. , Phosphating.

[0045] The chemical treatment solution contains: phosphoric acid 60g / l, zinc dihydrogen phosphate 50g / l, phytic acid 30g / l, tartaric acid 10g / l, thiourea 8g / l, accelerator 5g / l, molybdate 24g / l.

[0046] Still in the upside-down mode, it is sent to the drying device again, and is dried with hot air at 45°C.

[0047] Immediately after, the steel rail is transferred to the spray booth, 290g of sodium phytate is added to the aluminum-rich paint, and a cold-plated coating with a thickness of 25 microns to 75 microns is sprayed.

[0048] Finally, hoisting and stacking complete the storage of steel.

Embodiment 3

[0050] The steel rail is subjected to cold-plating anti-corrosion treatment by the present invention, and the steel rail is routinely placed and transported into a chemical treatment tank, and the temperature of the chemical treatment liquid is 25°C. Under the condition of no ultrasonic vibration, soak for 5 minutes to remove oil stains, rust and phosphating on the surface of the rail.

[0051] The chemical treatment solution contains: phosphoric acid 90g / l, zinc dihydrogen phosphate 70g / l, phytic acid 35g / l, tartaric acid 14g / l, thiourea 6g / l, accelerator 2g / l, molybdate 15g / l.

[0052] Still in the upside-down mode, it is sent to the drying device again, and is dried with hot air at 45°C. Immediately after, the steel rail is transferred to the spraying room, 270g of sodium phytate is added to the zinc-rich aluminum coating, and a cold-galvanized coating with a thickness of 25 microns to 75 microns is sprayed. Finally, hoisting and stacking complete the storage of steel.

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Abstract

A process for preparing a plated anticrossion Zn-, Al-, or ZnA-enriched layer on the surface of steel rail includes such steps as preparing a treating liquid from phosphoric acid, zinc dihydrogen phosphate, phytic acid, tartaric acid, thiourea, promoter and molybdate, immersing steel rail in it for removing oil and rust and forming a chemical film, drying at temp lower than 50 deg.C, and spraying or electrostatic plating said anticorrosion layer.

Description

Technical field [0001] The invention relates to a chemical treatment and coating process of steel, in particular to a process for coating a corrosion-resistant coating on the surface of a steel rail after chemical treatment. Background technique [0002] With the development of railway transportation in the direction of high speed and heavy load, coupled with the change of climate and environment, the online rails used by some domestic railway bureaus are seriously corroded. For example, the online rails in some tunnels are cracked due to corrosion and must be replaced after 2-3 years of use. ; Even the steel rails that are not on the line have pitted corrosion; the vehicles transporting poultry and refrigerated materials corrode the steel rails due to sewage discharge; due to the impact of the marine climate, the steel rails in coastal areas are generally severely corroded. Especially in alpine regions, such as Qinghai-Tibet Road, which is in a harsh climate and passes thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14C23C22/17
Inventor 田冰周家琮梅东生陈亚平程兴德邹明何其平张爱萍张昆吾张勇刚
Owner 攀枝花钢铁有限责任公司钢铁研究院
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