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Small pits appeared on the surface of the copper busbar

Small pits on a copper busbar are typically caused by localized corrosion, often due to moisture, halides, or environmental pollutants, and can compromise electrical performance if not addressed. Causes of Pitting on Copper BusbarsPitting corrosion is a localized form of corrosion that creates small holes or depressions on the copper surface. Common causes include: Moisture and humidity: Water acts as an electrolyte, promoting electrochemical reactions that lead to pitting.

Halide attack: Chlorides from saltwater sprays or chlorine in the air can initiate localized corrosion. Galvanic corrosion: Contact with more reactive metals (e.g., aluminum, steel) in the presence of moisture can accelerate pitting. Pollutants and chemical residues: Dust, dirt, or industrial chemicals on the busbar surface can absorb moisture and create corrosive microenvironments.

Electrical and thermal stress: Loose connections, high current loads, or hotspots can exacerbate surface degradation and promote pitting. Risks Associated with PittingIncreased electrical resistance: Pits can reduce the effective contact area, causing voltage drops and localized heating. Mechanical weakening: Over time, material loss from pitting can reduce the busbar's structural integrity.

Potential failure: Severe pitting may lead to arcing, insulation damage, or complete connection failure.

Preventive Measures

Environmental control: Keep enclosures dry, well-ventilated, and maintain stable temperature to prevent condensation. Surface protection: Apply tin, silver, or nickel plating to improve corrosion resistance and prevent galvanic reactions. Regular maintenance: Inspect busbars visually and with thermal imaging, clean surfaces, and re-torque connections to maintain low resistance.

Use of conductive paste: Apply oxidation-resistant paste at bolted joints to reduce moisture ingress and prevent localized corrosion. Air filtration: In polluted environments, use filters to remove corrosive gases and dust particles. Addressing pitting early through inspection and preventive maintenance can significantly extend the lifespan of copper busbars and maintain reliable electrical performance.

Small pits appeared on the surface of the copper busbar

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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