← Glossary

Blistering

Blistering occurs on coated metal surfaces due to osmotic processes or corrosion, causing paints or protective films to lift locally in blisters.

Physical-Chemical Mechanism of Action

Blistering occurs when a coated metal withstands environmental hydrogen exposure. This can happen through osmotic processes or corrosion. Hydrogen diffuses into the paint or protective film and forms blisters there.

Metallurgical Relevance & Welding Risks

Blistering reduces the durability of the coating because blisters are weak points. They can lead to corrosion or cracks and reduce the material's lifespan.

Workshop Practice & Action Guidelines

Avoid high environmental hydrogen exposure during coating. Ensure that paints or protective films are well applied with no gaps. If blistering is suspected, remove the coating and reapply it.

MetallurgieSchweißtechnik

AI Transparency (EU AI Act): Created on the basis of our own many years of practical experience in welding technology, with the help of AI, and reviewed editorially.

© 2026 Welder-World. All content is for training and continuing education and does not replace a certified welding procedure specification.