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Anti-corrosion construction method for irregular steel structural part

A technology of steel structure parts and construction methods, applied in hot-dip plating process, metal material coating process, coating, etc., can solve the problems affecting the mechanical properties of platform steel structure materials, affecting the safety of platform use, and having no power system, etc. Achieve the effect of reducing the risk of cracking, avoiding excessive thickness of the zinc layer, and reducing the degree of oxidation

Active Publication Date: 2016-02-24
SHANGHAI CONSTR JIANGSU STEEL STRUCTURE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The offshore drilling platform is a large-scale offshore engineering product. Its steel structure has been in the environment of salt spray, moisture, seawater and oily water for a long time. Corroded by these environmental factors, it will cause serious corrosion, and corrosion will affect the steel structure of the platform. The mechanical properties of structural materials, which affect the safety of the platform, will also affect its service life
In addition, since the platforms are mostly far away from the mainland, fixed-point oil production, and usually do not have a power system, this leads to a longer period of docking maintenance. Therefore, platform users attach great importance to the anti-corrosion problem of offshore platforms, and try to make the platform docking maintenance The longer the cycle, the better, which leads to higher and higher anti-corrosion requirements

Method used

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  • Anti-corrosion construction method for irregular steel structural part

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Comparison scheme
Effect test

Embodiment 1

[0017] Anti-corrosion construction method for unconventional steel structure parts (5.8 tons, Q460 material), including the following steps:

[0018] (1) Chamfering treatment: Grinding and chamfering all the sharp edges and R holes of the steel structure, the radius of the chamfering is controlled at 2mm, so as to enhance the adhesion between the coating and the corners of the base metal;

[0019] (2) Shot blasting: Steel structural parts after chamfering are shot blasted with steel shot abrasives with an average particle size of 0.3 mm to remove scale, rust and other pollutants, and obtain an average roughness of 25 μm to reduce Residual stress in the production of steel structural parts, reducing pickling time and obtaining higher adhesion of zinc layer;

[0020] (3) Hot-dip galvanizing: The steel structure after shot blasting is pickled first and then dipped into the zinc pool for galvanizing. The pickling time is 45 minutes, and the volume of the zinc pool is 143m 3 , The...

Embodiment 2

[0025] The anti-corrosion construction method of unconventional steel structure parts (6.3 tons, Q460 material), including the following steps:

[0026] (1) Chamfering treatment: Grinding and chamfering all the sharp edges and R holes of the steel structure, the radius of the chamfering is controlled at 2.5mm to enhance the adhesion between the coating and the corners of the base metal;

[0027] (2) Shot blasting: Steel structural parts after chamfering are shot blasted with steel shot abrasives with an average particle size of 0.45 mm to remove scale, rust and other pollutants, and obtain an average roughness of 32 μm to reduce Residual stress in the production of steel structural parts, reducing pickling time and obtaining higher adhesion of zinc layer;

[0028] (3) Hot-dip galvanizing: The steel structure after shot blasting is pickled first and then dipped into the zinc pool for galvanizing. The pickling time is 60 minutes, and the volume of the zinc pool is 158m 3 , The ...

Embodiment 3

[0033] Anti-corrosion construction method for unconventional steel structure parts (6 tons, Q460 material), including the following steps:

[0034] (1) Chamfering treatment: Grinding and chamfering all the sharp edges and R holes of the steel structure, the radius of the chamfering is controlled at 3mm, so as to enhance the adhesion between the coating and the corners of the base metal;

[0035] (2) Shot blasting: Steel structural parts after chamfering are shot blasted with steel shot abrasives with an average particle size of 0.6 mm to remove scale, rust and other pollutants, and obtain an average roughness of 39 μm to reduce Residual stress in the production of steel structural parts, reducing pickling time and obtaining higher adhesion of zinc layer;

[0036] (3) Hot-dip galvanizing: The steel structure after shot blasting is pickled first and then dipped into the zinc pool for galvanizing. The pickling time is 54 minutes, and the volume of the zinc pool is 149m 3 , The t...

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Abstract

The invention provides an anti-corrosion construction method for an irregular steel structural part. The anti-corrosion construction method includes the steps of chamfering treatment, shot blasting, hot-dip galvanizing, alkaline washing, sand blasting, coating and the like. The anti-corrosion construction method for the irregular steel structural part has the advantages that shot blasting is carried out before hot-dip galvanizing to remove stains on the surface, the attaching force of a zinc layer is improved, the manufacturing residual stress of the part is lowered, and the acid pickling time is shortened; the temperature of a zinc pool, the dip plating time and the cooling mode are controlled in the hot-dip galvanizing process, the cracking risks of base metal and a zinc layer are effectively reduced, and the quality of the zinc layer is improved; passivation is not permitted after galvanizing to increase the adhesive force of a subsequent coating; the surface of the zinc layer is cleaned with strong alkali solvents and high-pressure water to reduce the possibility of oil stains left on the surface of the zinc layer; the sand blasting pressure, moving speed of a gun nozzle, the distance between the gun nozzle and the surface of the zinc layer and the included angle between the gun nozzle and the surface of the zinc layer are controlled, reasonable roughness is obtained, the adhesive force of the coating is improved, and it is guaranteed that the thickness of the zinc layer is not reduced; a first layer of connecting paint is sprayed in a mist mode, and defects of the coating are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion construction, and in particular relates to an anticorrosion construction method for unconventional steel structure parts. Background technique [0002] The offshore drilling platform is a large-scale offshore engineering product. Its steel structure has been in the environment of salt spray, moisture, seawater and oily water for a long time. Corroded by these environmental factors, it will cause serious corrosion, and corrosion will affect the steel structure of the platform. The mechanical properties of structural materials affect the safety of the platform and also affect its service life. In addition, since the platforms are mostly far away from the mainland, fixed-point oil production, and usually do not have a power system, this leads to a longer period of docking maintenance. Therefore, platform users attach great importance to the anti-corrosion problem of offshore platforms, and try ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02C23C2/06C23C2/26C23C2/34
CPCC23C2/02C23C2/06C23C2/26C23C2/34
Inventor 胡辉徐文敏丁一峰黄海平
Owner SHANGHAI CONSTR JIANGSU STEEL STRUCTURE CO LTD
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