As a specialist поставщик труб и фитингов из нержавеющей стали in China, we can assure you:
Internal Pipe Corrosion poses a severe,often hidden threat to industrial systems globally.This degradation mechanism destroys the integrity of Трубы из нержавеющей стали.Furthermore,it compromises the safety and function of фитинги из нержавеющей стали.Understanding the various forms of internal corrosion is crucial.It ensures the longevity and safety of critical infrastructure.
What is Internal Pipe Corrosion?
Internal corrosion occurs on the inside surface of a pipe.The corrosion happens when the transported fluid chemically attacks the metal wall.Even stainless steel,with its защитный слой,is vulnerable.This vulnerability arises when specific corrosive elements are present.These elements destroy the passive хром oxide film.
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The Most Dangerous Forms of Internal Pipe Corrosion
Точечная коррозия
Pitting corrosion is highly localized and very aggressive.Small,deep holes form on the metal surface.These pits are hard to detect visually from the outside.They can quickly lead to perforation and leakage.The susceptibility of an alloy to this attack is measured by its PREN value.A lower PREN means higher risk.For example,testing is often done to assess the Pitting corrosion of duplex stainless steel pipe.
Коррозия в щелях
Crevice corrosion occurs in confined spaces.These spaces are often found under gaskets or flange faces.Fluid stagnation allows chlorides to concentrate heavily.This creates an extremely acidic environment locally.The corrosion rate inside the crevice accelerates rapidly.Engineers perform a Test Of Crevice Corrosion to validate material selection.Furthermore,the Critical Pitting Corrosion Temperature is a key factor.If the operating temperature exceeds this value, pitting risk dramatically increases.
Коррозионное растрескивание под напряжением
SCC is a catastrophic failure mechanism.It requires three conditions simultaneously:susceptible material,tensile stress and коррозионные среды.SCC produces fine cracks that grow perpendicular to the stress direction.These failures are often sudden and happen without warning.You can find more detail on this topic in articles discussing Коррозионное растрескивание под напряжением in stainless alloys.
Межкристаллитная коррозия
This corrosion form attacks the grain boundaries of the metal structure.It is most often caused by improper welding procedures.Welding heat can cause the precipitation of chromium carbides.This process,known as сенсибилизация,leaves the material vulnerable.The resulting damage destroys the material’s strength along the grain boundaries.For more information,read our guide on Межкристаллитная коррозия.
Atmospheric Corrosion (External Contrast)
While Internal Pipe Corrosion is our primary focus,external threats exist.Atmospheric corrosion primarily attacks the outer pipe surface.It results from exposure to moisture and airborne contaminants.Proper coating and insulation prevent this external damage.However,internal threats remain the greater danger to system integrity.
Impact of Internal Pipe Corrosion on Pipeline Infrastructure
- System Failure:
Corrosion reduces the pipe wall thickness.This causes loss of pressure integrity.The entire pipeline system becomes susceptible to rupture. - Product Contamination:
Corrosion particles can enter the fluid stream.This contaminates sensitive products.This is unacceptable in pharmaceutical or food-grade applications. - Expensive Repairs:
Repairing a corroded line involves costly shutdowns.Replacing damaged stainless steel pipe fittings and pipe sections is expensive.Prevention is far more cost-effective than repair. - Соответствие нормативным требованиям:
Pipeline failures violate safety and environmental regulations.Companies face significant fines and legal issues.Maintaining pipe integrity is a legal requirement.
Internal Pipe Corrosion Types and Causes
| Corrosion Type | Key Mechanism | Typical Cause | High Risk Component |
|---|---|---|---|
| Питтинг | Breakdown of Oxide Film | High Chlorides, Stagnant Fluid | Трубы из нержавеющей стали |
| Щель | Oxygen Concentration Cell | Gaps Under Gaskets | Фитинги |
| СКК | Tensile stress + Chlorides | High Temperature, High Stress | Welded Joints |
| Intergranular | Chromium Depletion At Boundaries | Improper Welding Heat | Зона сварки |
Strategies for Corrosion Mitigation
Возможно, вы также захотите прочитать:
Impact of Internal Pipe Corrosion
Why Stainless Steel Pipes Benefits Outweigh the Cost
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