Droplet Corrosion
Droplet corrosion arises from condensed water droplets on metal surfaces, which form anodic and cathodic zones under aeration differences. This leads to local attack of the surface.
Physicochemical Mechanism of Action
Droplet corrosion occurs when condensed water droplets land on metal surfaces and form anodic (oxidizing) and cathodic (reducing) zones due to aeration differences. The anode oxidizes, while the cathode undergoes reduction.
Metallurgical Relevance & Risks During Welding
Droplet corrosion can cause localized cracking and distortion of metal surfaces, especially in fine-grained structures. It can also reduce the service life of weld joints and contribute to deterioration of mechanical performance.
Workshop Practice & Action Instructions
To prevent droplet corrosion, keep metal surfaces dry and clean before welding. For fine-grained structures, regulate air flow to minimize condensed water droplets. If necessary, use special corrosion-inhibiting sprays or coatings.