Coating anticorrosion method for connection part of steel structure

Abstract

The invention discloses a coating anticorrosion method for connection parts of steel structures, which particularly comprises the following steps: (1) performing surface treatment to the connection part of a steel structure at a construction area to achieve a level of above St2 standard with no obvious bubbling or floating rust and no acute angle of surface protrusions; (2) uniformly smearing an anti-corrosion plaster on the surface of the connection part of the steel structure treated in step (1), wherein the amount of the anti-corrosion plaster is 10-1000 g / m2, and the smearing time is 1-10 times; (3) covering at least one layer of anti-corrosion strip outside the anti-corrosion plaster; (4) coating a protective cover at the surface of the anti-corrosion strip. The invention has excellent anticorrosion effect with an effective protection effect of above 20 years, has convenient construction and simple surface treatment, is operable with moisture and water, is applicable to structures with any shape, has good tightness and impact resistance, provides almost no additional load to structures, and has strong construction feasibility.

Description

technical field [0001] The invention relates to a steel structure anticorrosion process, in particular to a key anticorrosion treatment process for steel structure bolts and welding and other connection parts, especially to a coating anticorrosion method for steel structure bolts and welding and other connection parts, which belongs to the category of metal anticorrosion . Background technique [0002] The problem of metal corrosion pervades all sectors of the national economy, causing great harm to economic development, human life and social environment. The direct economic loss caused by the corrosion of metal materials is huge. According to statistics, the annual economic losses caused by corrosion account for about 2% to 4% of the gross national economic output in all countries in the world. This is a very alarming economic loss figure. In addition to causing economic losses, metal corrosion, especially localized corrosion, often causes catastrophic accidents, pollutes...

AI Technical Summary

Problems solved by technology

Domestic steel structures generally adopt coating anti-corrosion measures, but usually the construction conditions and surface treatment level required for coating anti-corrosion are relatively harsh. If the surface treatment does not meet the level, the anti-corrosion coating is easy to fall off, the protective effect is poor, and the maintenance cost is high.

Steel structures such as coastal power plants, ports and bridges are in harsh marine atmospheric corrosion environments, and it is difficult for ordinary anti-corrosion coatings to achieve the purpose of long-term anti-corrosion protection

Especially the connection parts such as bolt connection and welding of the steel structure, which have not been pre-treated for anti-corrosion, and the structure is complex. It is the first and most severely corroded part of the steel structure in each part. It is the focus and focus of steel structure anti-corrosion. Difficulties, there are no effective anti-corrosion measures at home and abroad

Due to the existence of a large number of bolts in the bolted connection part, there are many dead angles in the surface treatment, which makes it difficult for the surface treatment to meet the required level. At the same time, there are gaps between the connecting plate and the connected plate. Usually, no anti-corrosion treatment can be carried out, and the corrosive medium is easy to enter the gap between the steel plates and is not easy to discharge, resulting in serious chemical and electrochemical corrosion in this part, making the protection more difficult; there are also uneven surface materials in the welding part, which is more serious At the same time, due to the existence of welding stress and welding deformation, the surface anti-corrosion coating is easy to fall off, and the anti-corrosion difficulty is also relatively large.

The greater difficulty of protection makes the connection parts such as bolt connection and welding serious corrosion, easy to brittle fracture in this part, seriously affecting the life and safety of the steel structure

Due to the strict requirements of ordinary coating technology on construction conditions, the anti-corrosion coating treated with coating technology on the connection parts such as bolt connection and welding is easy to fall off, the protection effect is poor, and the maintenance cost is high

The on-site investigation of Binhai Power Plant proves that after the bolt connection and welding parts are protected by coating, the coating on these parts will start to bubble or even fall off in a short period of time, and the corrosion will extend from under the coating, and the coating will lose its due strength. protective effect