Surface treatment method for weathering resistant steel

A technology for surface treatment and weathering steel, applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve problems such as stabilization treatment of rust layer on the surface of mature weathering steel components that have not yet been developed, and is conducive to popularization. Application, uniform appearance and color, simple process steps

Active Publication Date: 2016-05-11
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, some work has been carried out in China on the surface stabilization treatment of weathering steel, but no mature technology widely used in the stabilization of rust layer on the surface of weathering steel components has been developed.

Method used

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  • Surface treatment method for weathering resistant steel
  • Surface treatment method for weathering resistant steel
  • Surface treatment method for weathering resistant steel

Examples

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Effect test

Embodiment 1

[0035] The weather-resistant steel plate with a thickness of 4 mm and a grade of Q355GNH is subjected to shot peening treatment with a pressure of 0.4 MPa and 50 mesh quartz glass shot (surface roughness is Ra2. After oxidation treatment, a reddish-brown oxide film can be obtained, which can promote the formation of a stable rust layer, and there is no rust liquid hanging phenomenon outdoors.

Embodiment 2

[0037] The weather-resistant steel plate with a thickness of 3mm and a grade of SPA-H is shot peened with a pressure of 0.6MPa and 60-mesh ceramic shot (surface roughness is Ra2.50μm-Ra3.50μm), and then subjected to a temperature of 300°C for 2 hours The reddish-brown oxide film is obtained through pre-oxidation treatment, which can promote the formation of a stable rust layer, and there is no rust liquid hanging phenomenon outdoors.

Embodiment 3

[0039]The weather-resistant steel plate with a thickness of 2mm and a grade of Q355GNH is subjected to shot peening treatment with a pressure of 0.5MPa and 40-mesh steel shot (surface roughness is Ra2.50μm-Ra3.50μm), and then pre-oxidized at 350°C for 1 hour After treatment, a reddish-brown oxide film can be obtained, which can promote the formation of a stable rust layer, and there is no rust liquid hanging phenomenon outdoors.

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Abstract

The invention discloses a surface treatment method for weathering resistant steel. The method comprises the following steps that firstly, the weathering resistant steel is subjected to surface shot blasting treatment, and the surface roughness of the weathering resistant steel is between Ra 2.50 microns and Ra 3.50 microns; and secondly, the weathering resistant steel subjected to shot blasting treatment is subjected to high-temperature oxidation for 1 h-4 h at the temperature of between 250 DEG C and 350 DEG C, and then a dense rufous oxidation layer can be obtained. The appearance and color of the oxidation layer are similar to those of the weathering resistant steel used for a long time, and forming of a stable rust layer can be promoted. The method is simple in procedure, cost is low, environment friendliness is achieved, and it is avoided that a common surface stabilization coating applying method is utilized for rapidly stabilizing the weathering resistant steel, and consequently the environment is polluted.

Description

technical field [0001] The invention belongs to the technical field of steel anticorrosion, in particular to a method for surface treatment of weathering steel. Background technique [0002] Compared with carbon steel, weathering steel can form a dense and stable rust layer with good adhesion in the atmosphere, which hinders the penetration of corrosive media, so it has better corrosion resistance. However, it generally takes several years to complete the stabilization of the rust layer in the natural environment. Before the formation of a stabilized rust layer, the corrosion rate is relatively high, and the phenomenon of rust liquid hanging and flying often occurs, polluting the surrounding environment, and forming a stable rust layer. After the rust layer, the corrosion rate is significantly reduced. Since the exposed weathering steel corrodes before delivery, it is even difficult to guarantee a uniform appearance at the time of delivery, which is even difficult for custo...

Claims

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Application Information

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IPC IPC(8): C23C8/14
CPCC23C8/14
Inventor 岳增武李辛庚王学刚曹建梅王晓明闫风洁樊志彬郭凯翟季青
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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