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Method for enhancing corrosion resistance and fatigue resistance of ocean structural steel

A fatigue performance, marine structure technology, applied in metal material coating process, fusion spraying, coating and other directions, can solve the problem of high maintenance cost, achieve the effect of strong corrosion resistance and fatigue resistance, and easy to be widely used

Inactive Publication Date: 2014-10-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Due to the high maintenance cost, how to improve the corrosion fatigue resistance of structural steel has become the key problem to be solved first

Method used

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  • Method for enhancing corrosion resistance and fatigue resistance of ocean structural steel

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Embodiment Construction

[0014] Such as figure 1 As shown, the method for enhancing the corrosion fatigue resistance of marine structural steel includes the following steps:

[0015] 1), surface purification treatment

[0016] Choose X80 structural steel, check the appearance of the structural steel workpiece, polish the surface burr and flash, and use manual or power tools to remove rust.

[0017] After treatment, there is no visible grease and dirt on the surface of the structural steel, no attached scale, rust and paint layer, the derusting result should meet the requirements of the national standard ISO8501-1Sa2.5, and the surface of the structural steel should show a uniform metallic luster. The surface roughness reaches 50-80μm.

[0018] 2), sandblasting and rust removal

[0019] In order to ensure the roughness and cleanliness of the metal surface, copper ore sand or corundum sand is used as the sandblasting abrasive, which has edges and corners. Keep it between 70 and 80 degrees.

[0020]...

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Abstract

The invention belongs to the field of metal material corrosion, and particularly relates to a method for enhancing the corrosion resistance and fatigue resistance of ocean structural steel, so as to prolong the engineering service life of the ocean structural steel. The method comprises the following steps: 1) surface purification treatment; 2), sand blasting for derusting; 3), electric arc spraying of zinc-aluminum alloy; 4), surface cleaning and spraying detection; 5), sealed treatment; 6), spraying or brushing of a seal coating. The ocean structural steel prepared according to the method is high in corrosion resistance and fatigue resistance, so as to be widely applied to ocean engineering conveniently.

Description

technical field [0001] The invention belongs to the field of metal material corrosion, and in particular relates to a method for enhancing the corrosion fatigue resistance of marine structural steel, which is used to improve the engineering service life of marine structural steel. Background technique [0002] There are various steel structures that bear cyclic loads in marine engineering, such as drilling risers, oil production risers, etc., which have been exposed to salt spray and seawater for a long time, and are eroded by the harsh marine environment for a long time, which is extremely prone to corrosion fatigue failure, which seriously affects production operations Safety. The corrosive environment will reduce the fatigue fracture toughness of the steel structure, accelerate the initiation and propagation of cracks, and greatly reduce the service life. Due to the high maintenance cost, how to improve the corrosion fatigue resistance of structural steel has become the ...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/08C23C4/18C23C4/131
Inventor 黄小光曹宇光王黎明徐国强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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