地下鉄のインフラストラクチャから派生するダイナミックな流動によって影響されるパイプラインの腐食行動
Jifeng Ding1,2, Xiaolong Liu2, Guangjiao Ma2
1China Iron & Steel Research Institute, Beijing 100081, China.
ACS omega
|February 16, 2026
まとめ
地下鉄からのダイナミックな乱流は,埋もれたパイプラインの腐食を強める. カソード保護は,潜在的な差を低くし,動的条件下でもピッティングを防ぐことで,この腐食を大幅に軽減します.
科学分野:
- マテリアルサイエンス 材料科学
- 腐食工学 腐食工学とは
- 電気化学 電気化学について
背景:
- 埋もれたパイプラインは,地下鉄からの長期のダイナミックな流浪電流の干渉のために,強化された腐食に直面しています.
- カソード保護は,パイプラインの腐食を軽減するための重要な技術です.
研究 の 目的:
- ダイナミック・ストレイ電流による腐食に対する埋もれたパイプラインの保護におけるカソッド保護の有効性を調査する.
- パイプラインの腐食特性とカソッド保護の保護性能に対するダイナミックな流動流の影響を分析する.
主な方法:
- 地下鉄の近くの埋もれたパイプラインのダイナミックな流動のフィールド測定.
- 電気化学試験は,流浪電流の異なる条件下での腐食行動を評価するために行われます.
- -1.2V (対 SCE) のカソッド保護の適用と評価.
主要な成果:
- ダイナミックな乱流は,局所的な腐食と表面の不均一性を促進し,一般的な腐食率に最小限の影響を及ぼします.
- カソード保護は,潜在差を効果的に減らし, -1.2 V (対 SCE) でピッティングを防ぐ.
- 流浪電流の密度が増加すると,腐食の可能性が正にシフトし,腐食電流の密度と陽極制御が増加し,抵抗が低下します.
結論:
- カソード保護は,埋もれたパイプラインのダイナミックな流失電流の腐食を大幅に軽減します.
- カトドプロセスは強化され,カロージョンポテンシャルがネガティブにシフトする. カトド保護の適用で.
- 局所的な腐食特性を防止するために,最適のカソッド保護ポテンシャルが不可欠です.
関連する概念動画
Corrosion
28.6K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
28.6K
Corrosion of Reinforcement
600
The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
600
Multiple Pipe Systems
1.2K
Multipipe systems consist of complex configurations of interconnected pipes designed to transport fluids efficiently across intricate networks. They are essential in engineering applications requiring precise control over flow distribution, pressure, and head loss. They are categorized into series, parallel, loop, and network configurations, each distinguished by unique flow characteristics and applications.
Series Configuration
In a series configuration, fluid flows sequentially from one pipe...
Series Configuration
In a series configuration, fluid flows sequentially from one pipe...
1.2K
Major Losses in Pipes
2.0K
When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
2.0K
Single Pipe Systems
470
In pipe flow analysis, problems are typically categorized into three types — Type I, Type II, and Type III — based on the known parameters and the desired outcome. Each type of problem addresses specific engineering requirements using fluid properties, pipe characteristics, and operational conditions.
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are...
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are...
470
General Characteristics of Pipe Flow II
1.6K
When fluid enters a pipe, it first passes through the entrance region, where the velocity profile adjusts due to viscous effects. In this region, a boundary layer forms along the pipe walls and grows until it fully occupies the pipe's cross-section. Once the boundary layer merges, the flow becomes fully developed, with a steady velocity profile that remains consistent along the pipe's length.
The distance to reach a fully developed flow is called the entrance length and depends on the...
The distance to reach a fully developed flow is called the entrance length and depends on the...
1.6K


