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Method for preparing chloride ion corrosion resistant bar material with nano composite coating

A nano-composite coating, ionic corrosion technology, used in coatings, devices for coating liquids on surfaces, anti-corrosion coatings, etc. problem, to achieve the effect of being conducive to industrialization, low cost and simple process

Inactive Publication Date: 2011-07-27
NANTONG BAOSTEEL IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the classic corrosion failure mechanism of the coating film, there are usually three forms of corrosion failure of the coating film in the corrosive medium: one is that the adhesion between the coating and the substrate is poor, and it falls off; the other is that the coating itself is exposed to acid, alkali, salt and other media The erosion of the substrate has lost the protection of the substrate; the third is that the coating has defects (such as pinholes) or the coating has poor impermeability, such as Na + , Cl - Plasma can be diffused, which greatly reduces the resistance of the coating and causes localized corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Several pieces of ordinary carbon steel plate Q275 (size 20×10×2.0mm) were taken, the surface was polished with metallographic sandpaper, washed with absolute ethanol and acetone in sequence, dried, and placed in a desiccator for later use.

[0018] The composition of the nano-Cr-Mo composite solution is: nano-Cr powder 10g / L, nano-Mo powder 5g / L, nano-silicon aluminum oxynitride powder 5g / L, ethanol:butanol=1:4. Ultrasonic dispersion of the complex solution for 30min. The prepared nano-composite solution was sprayed onto the surface of the carbon steel plate by a nano-spraying unit, and dried naturally, and the thickness of the composite nano-coating was 5 μm.

[0019] The surface-treated carbon steel with alloyed layer composite structure was measured for coating thickness, and the microscopic density was observed. Polarization was carried out in artificial seawater at 35 degrees under constant voltage for 48 hours. In the case of corrosion, set the potential at a hi...

Embodiment 2

[0021] Several pieces of ordinary carbon steel plate Q275 (size 20×10×2.0mm) were taken, the surface was polished with metallographic sandpaper, washed with absolute ethanol and acetone in sequence, dried, and placed in a desiccator for later use.

[0022] The composition of the nano-Cr-Mo composite solution is: nano-Cr powder 12g / L, nano-Mo powder 7g / L, nano-silicon aluminum oxynitride powder 6g / L, ethanol:butanol=1:4. Ultrasonic dispersion of the complex solution for 30min. The prepared nano-composite solution was sprayed onto the surface of the carbon steel plate, and air-dried naturally. The thickness of the composite nano-coating was 10 μm.

[0023] The surface-treated carbon steel with alloyed layer composite structure was measured for coating thickness, and the microscopic density was observed. Polarization was carried out in artificial seawater at 35 degrees under constant voltage for 48 hours. In the case of corrosion, set the potential at a higher voltage and perfor...

Embodiment 3

[0025] Several pieces of ordinary carbon steel plate Q275 (size 20×10×2.0mm) were taken, the surface was polished with metallographic sandpaper, washed with absolute ethanol and acetone in sequence, dried, and placed in a desiccator for later use.

[0026] The composition of the nano-Cr-Mo composite liquid is: nano-Cr powder 14g / L, nano-Mo powder 9g / L, silicon-aluminum oxynitride powder 7g / L, ethanol:butanol=1:4. Ultrasonic dispersion of the complex solution for 30min. The prepared nano-composite solution was sprayed onto the surface of the carbon steel plate, and air-dried naturally. The thickness of the composite nano-coating was 15 μm.

[0027] The surface-treated carbon steel with alloyed layer composite structure was measured for coating thickness, and the microscopic density was observed. Polarization was carried out in artificial seawater at 35 degrees under constant voltage for 48 hours. In the case of corrosion, set the potential at a higher voltage and perform the s...

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Abstract

The invention relates to a method for preparing a chloride ion corrosion resistant bar material with a nano composite coating, which comprises the following steps of: (1) sequentially cleaning a bar material by using absolute ethanol and acetone, and drying the cleaned bar material; (2) adding 10 to 16 g / L of nano Cr powder, 5 to 11 g / L of nano Mo powder and 5 to 8 g / L of nano silicon aluminum oxynitride powder into an organic solvent, and performing ultrasonic dispersion to obtain nano composite solution; and (3) coating the nano composite solution on the surface of the bar material in a thickness of 5 to 20 microns, and performing natural airing to obtain the bar material, the surface of which is coated with the composite nano coating. The method has simple process and low cost, and is favorable for industrialization; compared with common carbon steel, the chloride ion corrosion resistance of the bar material coated with the composite nano coating is remarkably improved and even canbe compare favorably with alloyed steel; and the bar material has good application prospect.

Description

technical field [0001] The invention belongs to the field of bar surface coating, in particular to a preparation method of a chloride ion corrosion-resistant bar with a nanocomposite coating. Background technique [0002] There are highly permeable and corrosive chloride ions in the marine environment and seawater. At present, the commonly used marine engineering protection method is to apply marine coatings that resist seawater corrosion. The two basic series of marine coatings are marine anti-fouling coatings and marine anti-corrosion coatings. According to the use environment of different facilities, it can be divided into marine coatings, heavy-duty anti-corrosion coatings for marine engineering facilities, etc. Ship coatings are divided into ship bottom anticorrosion and antifouling coatings, hull coatings, deck coatings, interior cabin coatings and various special functional coatings according to the parts used. Marine anti-corrosion coatings include a wide range and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/08B05D7/14B05D1/02B05D3/12B05D3/10B05D3/00C09D1/00C09D5/10
Inventor 刘卫东罗检钟庆东卢鑫华杨志强
Owner NANTONG BAOSTEEL IRON & STEEL CO LTD