A Professional Analysis Of Copper Terminal Blocks, From Material Properties To Environmental Factors.

During prolonged use, pitting may occur on the contact surface of copper terminal block. Pitting corrosion typically begins in a small, localized area, gradually expanding as the electrochemical reaction continues. This localized corrosion not only affects the electrical conductivity of copper distribution block, but may also lead to an increase in contact impedance, affecting the stability of the entire power distribution system.

Analysis of Pitting Corrosion Causes

Pitting corrosion on the contact surfaces of copper terminal blocks primarily stems from the interaction of microscopic inhomogeneities on the material surface and environmental factors. When micro-defects or impurities exist on the metal surface, local potential differences form micro-cell structures, promoting pitting corrosion. Environmental humidity, temperature changes, acidic or alkaline media, and airborne pollutants all accelerate the corrosion process of copper terminal blocks.

Microstructure influence

• copper terminal strip with high surface roughness is more likely to form micro-battery reactions.

• Uneven distribution of trace elements in the copper alloy composition enhances localized electrochemical activity.

• Insufficient contact pressure leads to uneven oxide film formation, with pitting concentrated in high-resistance areas.

Usage Environment and Pitting Corrosion Development

The installation location and operating conditions of copper terminal blocks significantly affect the pitting corrosion rate. Humid environments promote the formation of an electrolyte film on the surface of copper terminal blocks, accelerating the corrosion reaction. Frequent current fluctuations and high-temperature operation alter the local metal dissolution rate, causing pitting corrosion to gradually expand. Furthermore, sulfide and chloride contaminants in the air can form localized corrosion centers on the surface of the copper terminal blocks, further accelerating pitting corrosion development.