Outer surface anti-corrosion composite metal pipe based on cathode protection and manufacturing method of outer surface anti-corrosion composite metal pipe

Abstract

The invention provides an outer surface anti-corrosion composite metal pipe based on cathode protection and a manufacturing method of the outer surface anti-corrosion composite metal pipe, relates to the technical field of anti-corrosion pipelines, and aims at remarkably improving the use safety and prolonging the service life of the metal pipeline and still ensuring that an inner-layer basic pipe is not corroded even if a surface anti-corrosion metal layer is damaged or perforated. The composite metal pipe comprises an inner-layer base metal pipe and a surface-layer corrosion-resistant metal pipe, the inner-layer basic metal pipe and the surface-layer corrosion-resistant metal pipe are fixedly assembled in a sleeving manner; a plurality of annular metal glues arranged at intervals are arranged between the inner-layer basic metal pipe and the surface-layer corrosion-resistant metal pipe; the oxidation-reduction property of the corrosion-resistant metal pipe material on the surface layer is higher than that of the basic metal pipe material on the inner layer. The technical scheme provided by the invention is suitable for designing and manufacturing the corrosion-resistant metal pipe.

Description

technical field [0001] The invention relates to the technical field of corrosion-resistant pipelines, in particular to a cathodic protection-based outer surface anti-corrosion composite metal pipe and a manufacturing method thereof. Background technique [0002] In the pipeline transportation of oil and natural gas, as well as petroleum refining and chemical raw material production enterprises, a large number of pipelines are exposed to humid air or strata with corrosive media for a long time, resulting in serious corrosion of the outer surface of the pipeline, which directly affects the safety and service life of the pipeline. Even major safety accidents are caused by pipeline leakage, resulting in material loss, environmental pollution, and even serious consequences of casualties. At present, the use of corrosion-resistant metal materials for the entire pipeline or the coating of anti-corrosion coatings on the outer surface of the pipeline are effective means to solve such...

AI Technical Summary

Problems solved by technology

However, the use of corrosion-resistant metal materials for the entire pipeline will greatly increase the production and operating costs of the pipeline; the plastic anti-corrosion layer coated on the outer surface of the pipeline is prone to aging, embrittlement, and short aging; the thickness of the metal coating or organic coating on the outer surface of the pipeline Thin, there is a potential difference with the base material, and electrochemical corrosion will occur with the base metal after damage, accelerating the corrosion of the base tube

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