Inner wall anti-corrosion process suitable for thin and short HDPE corrugated pipe

Abstract

The invention discloses an inner wall anti-corrosion process suitable for a thin and short HDPE corrugated pipe, and belongs to the field of corrugated pipe anti-corrosion processes. A traditional spraying mode is abandoned, coating tools including a multi-opening front cover, a double-layer film sleeve and a single-opening rear cover are innovatively introduced, and the shape change of the double-layer film sleeve is controlled through air flow to assist in the inner wall anti-corrosion process of the thin and short HDPE corrugated pipe, the space between the double-layer film sleeve and a pipe body is fully and densely filled with anti-corrosion coating, blind-spot-free covering is achieved, a uniform and complete anti-corrosion layer is formed, meanwhile, through cooperative use of the multi-opening front cover and the single-opening rear cover, the low overflow rate and the high recovery rate of the anti-corrosion coating are achieved, on the basis of not increasing the cost of the anti-corrosion coating, the blind-spot-free and efficient coating process of the thin and short HDPE corrugated pipe is realized, and great economic and practical benefits are achieved.

Description

technical field [0001] The invention relates to the field of corrugated pipe anticorrosion technology, and more specifically relates to an inner wall anticorrosion technology suitable for thin and short HDPE corrugated pipes. Background technique [0002] Pipe anticorrosion refers to the chemical reaction of steel pipes in use and transportation due to the influence of the use environment and the transmission medium, resulting in corrosion. Corrosion will cause great damage to metal pipes, because no matter how good the external coating is and how advanced the external anti-corrosion technology is, if the internal anti-corrosion is not carried out, it will cause corrosion and be scrapped prematurely. However, internal corrosion is concealed, and its existence is often ignored by people. At the same time, due to the particularity of the conveying medium, the internal corrosion of the pipe is very serious, even far exceeding the external corrosion. Statistics show that up to...

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Problems solved by technology

[0003] The coating technology in the pipe is the research focus of the anti-corrosion technology in the pipe, and the smaller the diameter of the pipe, the more difficult it is to apply. In the prior art, the method of spraying and film-forming is often used to form an anti-corrosion layer on the inner wall of the pipe. First of all, it is difficult to uniformly and comprehensively coat the inner wall of the pipe. Spray the corrosion inhibitor. Secondly, for corrugated pipes with uneven inner walls, there are likely to be blind spots in the spraying method, and it is more difficult to form a comprehensive and uniform anti-corrosion layer.

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