Les pipelines en PE doivent-ils être anticorrosifs pendant la construction enterrée?

2025-08-18

Dans la construction enterrée de tuyaux en PE, de nombreuses personnes se demanderont si un traitement anticorrosion est nécessaire. En fait, les tuyaux en PE (polyéthylène) eux-mêmes ont une excellente stabilité chimique et une excellente résistance à la corrosion, ce qui est l'un de leurs avantages significatifs par rapport aux tuyaux métalliques traditionnels. Dans des circonstances normales, les tuyaux en PE n'ont pas besoin d'un traitement anticorrosion complexe comme les tuyaux métalliques lorsqu'ils sont enterrés. Le matériau

PE lui-même a une forte résistance aux acides et aux alcalis, aux embruns salins et à la corrosion du sol. Il n'est pas facile de réagir avec les produits chimiques dans le sol, ni de produire de la corrosion électrochimique ou de la rouille comme les tuyaux métalliques. Cela permet aux tuyaux en PE de maintenir l'intégrité structurelle et de bonnes performances de transport pendant longtemps dans la plupart des environnements de sol en fonction de leur propre matériau.

Cependant, cela ne signifie pas que les tuyaux en PE peuvent être complètement "striés.

Tout d'abord, si l'environnement du sol est extrêmement rude, comme la présence de concentrations élevées de produits chimiques corrosifs, de sols extrêmement acides ou alcalins, qui sont au-delà de la plage de tolérance du matériau PE lui-même, des mesures d'isolation ou de protection supplémentaires peuvent être nécessaires pour le pipeline, telles que l'utilisation d'un tubage spécial ou d'un revêtement anticorrosion (le revêtement ici est plus destiné à la corrosion chimique extrême, qu'à la corrosion au sens conventionnel). Deuxièmement, dans certaines zones où il peut y avoir un risque de dommages mécaniques, comme un sol contenant un grand nombre de pierres tranchantes, un roulement fréquent de charges lourdes au sol ou des interférences potentielles telles que l'excavation de construction, afin d'éviter que la paroi extérieure du pipeline PE ne soit rayée ou endommagée par la pression, des mesures telles que la pose de coussins (comme du sable fin et du sol fin), la mise en place de ceintures d'avertissement et la protection du boîtier sont généralement prises. Bien que l'objectif principal de ces mesures soit la protection physique, elles protègent également indirectement le pipeline contre les problèmes de corrosion qui peuvent être causés par des dommages.

De plus, pendant le transport, le stockage et la construction des pipelines PE, une exposition à long terme au soleil doit être évitée pour éviter le vieillissement aux ultraviolets. Bien que cela n'appartienne au traitement anticorrosion après l'enterrement, il est important de garantir la performance du pipeline.

En résumé, les pipelines en PE n'ont généralement pas besoin de traitement anticorrosion spécial lorsqu'ils sont enterrés dans des environnements de sol conventionnels en raison de leur excellente résistance à la corrosion. Cependant, face à des environnements corrosifs extrêmes, à un risque élevé de dommages mécaniques et à d'autres conditions de travail spéciales, une enquête et une évaluation techniques complètes doivent être effectuées et, si nécessaire, des mesures de protection ciblées telles que la sélection de matières premières en PE de qualité supérieure, l'ajout de couches de protection et l'installation de tubages doivent être prises pour garantir que le système de pipeline en PE peut fonctionner en toute sécurité et de manière stable pendant une longue période. En même temps, des opérations de construction standardisées et un contrôle qualité strict jouent également un rôle pour garantir la durée de vie des tuyaux en PE.


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