Stray current corrosion
DC corrosion from stray currents occurs in metal structures affected by external DC sources like railway systems. At current exit points, severe corrosion attack can happen.
Physical-Chemical Mechanism of Action
Direct current corrosion from stray currents occurs when metals are affected by DC from external sources like railway systems. Surrounding electrolytes complete the circuit, causing the metal to corrode anodically and lose material.
Metallurgical Relevance & Risks in Welding
This corrosion can lead to serious material loss and cracking. It's especially dangerous for underground or grounded metal structures, as it can undermine them over time.
Workshop Practice & Action Instructions
To avoid DC corrosion, protect metal structures from external DC. Insulate them or use corrosion-resistant materials. For existing structures, regular inspection and cleaning are required.