Multilayer Pipeline Coating Resolving Adhesion Corrosion Trade-off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Metal pipelines used in the oil and gas industry face issues with corrosion due to harsh environments, leading to detachment of coatings and increased corrosion rates, despite the use of fluoropolymer coatings and primers, which fail to maintain adhesion under high temperature and pressure conditions.
Innovation Solution
A multilayer assembly comprising a metal compound layer, an epoxy resin layer, and a functional fluoropolymer layer with specific compositions and application processes, ensuring excellent interlayer adhesion and anti-corrosion properties while maintaining thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoropolymer coatings and primers are used on metal pipelines, then chemical resistance to hydrocarbons and corrosive gases is improved, but adhesion under high temperature and pressure conditions deteriorates
Solution Approach 1:
The coating system is divided into multiple functional layers: a metal primer layer providing adhesion to the metal substrate, an intermediate fluoropolymer layer providing chemical resistance, and an outer protective layer. This segmentation allows each layer to specialize in one function, preventing the adhesion-chemical resistance trade-off that occurs in single-layer systems.
Solution Approach 2:
The invention uses composite material structures combining different polymers and metal compounds in specific layers. The primer layer contains metal compounds for strong metal bonding, while the fluoropolymer layer provides chemical inertness. This composite approach allows the system to exhibit both strong adhesion and excellent chemical resistance simultaneously.
2Strength
If metal pipelines are used to withstand high internal pressures and temperatures, then mechanical strength is improved, but corrosion resistance deteriorates due to severe environment
Solution Approach 1:
The multi-layer coating system acts as an intermediary barrier between the metal pipeline and the corrosive environment. The primer layer with metal compounds provides strong anchoring to the metal surface, while the fluoropolymer layers create a chemically inert barrier that prevents moisture and corrosive substances from reaching the metal, thus protecting it from corrosion while allowing the metal to maintain its mechanical strength.
3Reliability
If coating layers are applied to protect metal pipelines, then corrosion protection is improved, but thermal insulation properties deteriorate
Solution Approach 1:
The invention uses thin-film coating structures that provide adequate corrosion protection through multiple functional layers rather than relying on thick single layers. The primer layer is applied at controlled thickness (10-50 μm) and the fluoropolymer layers are applied as thin films (50-200 μm each), minimizing the total coating thickness and thus minimizing the impact on thermal insulation properties while still providing effective corrosion protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multilayer assembly effectively withstands severe environmental conditions, exhibits outstanding interlayer adhesion, and provides good anti-corrosion and thermal insulation properties, preventing coating detachment and subsequent corrosion in metal pipelines.
Implementation Method 1
the first surface of said layer (L2) is directly adhered to the second surface of said layer (L1)
Implementation Method 2
the first surface of said layer (L3) is directly adhered to the second surface of said layer (L2)
Implementation Method 3
coatings based on fluoropolymers, in particular vinylidene fluoride-based polymers, are advantageously resistant to these severe environment conditions on account of their chemical resistance to hydrocarbons and/or corrosive gases
Implementation Method 4
maintaining good anti-corrosion properties and good thermal insulation properties
Data Source
AI summary
The present invention pertains to a multilayer assembly, to a process for the manufacture of said multilayer assembly, to a pipe comprising said multilayer assembly and to uses of said pipe in various applications.