Corrosion of optical fiber core
Optical fiber cores, typically made of silica, can undergo corrosion in harsh environments, but protective coatings and metal oxide films significantly enhance their resistance and longevity.
Mechanisms of Corrosion
The core of an optical fiber, usually composed of silica glass, can degrade when exposed to high temperatures, reactive chemicals, or molten salts. For example, raw fibers are resistant to lead-bismuth eutectic at 600 °C but are incompatible with FLiNaK molten salts, high-temperature steam at 1200 °C, and pressurized water at 300 °C, which can lead to structural and optical degradation . Corrosion occurs when environmental fluids penetrate the cladding and react with flaws on the fiber surface, weakening the fiber mechanically and optically .
Protective Measures
To mitigate corrosion, several strategies are employed:
- Thin quasi metal oxide films: A 10 nm metal oxide layer on the cladding surface can block environmental fluids, preventing corrosion and improving mechanical reliability .
- Polymer coatings: Protective polymers can incorporate corrosion-inhibiting reagents that diffuse to the fiber surface, offering similar protection without direct deposition on the cladding .
- Metallic bilayers for sensing: Optical fibers can be coated with metallic double layers (e.g., Ti/Al or Ni/Al) to monitor corrosion rates while simultaneously protecting the fiber .
- Gold coatings: In highly corrosive molten salt environments, gold coatings improve fiber survivability .
Corrosion Monitoring
Optical fibers can also serve as corrosion sensors. By depositing thin metallic films on the fiber core, changes in reflected optical signals can indicate corrosion progression. This approach allows simultaneous optical and electrochemical monitoring, providing precise information on degradation in hidden or harsh environments .
Environmental Considerations
The susceptibility of optical fibers to corrosion depends on temperature, chemical composition, and pressure. Fibers in nuclear reactors, concentrated solar power plants, or marine environments require careful material selection and protective coatings to ensure long-term performance .
Summary
While silica-based optical fiber cores are inherently resistant to many conditions, extreme temperatures, reactive chemicals, and high-pressure environments can induce corrosion. Protective coatings, metal oxide films, and polymer layers significantly enhance durability, and optical fibers can be engineered to both resist corrosion and monitor environmental degradation effectively .
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