Will The Quality Of Terminal Blocks Be Affected By Salt Content?
In marine engineering, outdoor power distribution, or coastal electronic equipment, terminal blocks are facing the silent erosion of salt. The chloride ions in salt are like invisible killers, quietly changing the fate of metal terminals.
Trio of Corrosion Mechanisms:
Electrolysis acceleration: Salt combines with air humidity to form an electrolyte solution, causing oxygen corrosion of copper alloy terminals. The reaction equation Cu → Cu ² ⁺+2e ⁻ is accelerated under chloride ion catalysis, and the corrosion rate is 5-8 times higher than in dry environments.
Intercrystalline penetration: For stainless steel terminals, chloride ions can damage the chromium oxide protective layer, penetrate deep into the metal along grain boundaries, causing stress corrosion cracking and a strength decrease of up to 40%.
Conductivity degradation: The volume expansion of corrosion products generates internal stress, leading to microcracks on the terminal contact surface, an increase in contact resistance of more than 30%, and the risk of local overheating.
The superposition effect of environmental variables:
Humidity threshold: When the relative humidity exceeds 65%, the hygroscopic effect of salt is significantly enhanced, and the corrosion rate increases exponentially.
Temperature synergy: An environment above 35 ℃ will accelerate the diffusion of chloride ions, reducing the failure time of tin plating by 60%.
Mechanical vibration: Vibration accelerates the detachment of corrosion products, forming new active surfaces and forming a vicious cycle of "corrosion detachment re corrosion".
The game of protective technology:
Material upgrade: Using nickel based alloy or fluorocarbon coating terminals, the corrosion resistance is increased by 10 times, but the cost increases by 300%.
Sealing revolution: IP68 protection grade combined with silicon gel encapsulation can isolate salt intrusion, but affect heat dissipation performance.
Intelligent monitoring: Embedded microsensors detect Cl ⁻ concentration in real time, with a warning accuracy of 0.1ppm, and combined with an automatic dehumidification device to form a closed-loop protection.
The battle between metal and salt reveals that in harsh marine environments, the service life of ordinary terminals is less than 3 years, while the use of composite protection technology can extend the service life to more than 15 years. The ultimate test of terminal quality lies in whether it can crack the corrosion code of salt.
