Crevice corrosion
Crevice corrosion occurs in narrow gaps or spaces due to oxygen depletion and acidification with aggressive ions. It leads to local wear problems.
Physicochemical Mechanism of Action
Crevice corrosion occurs when there is a lack of oxygen in narrow gaps or crevices. This leads to local acidification and enrichment of aggressive ions such as chloride ions. The acidification is highly concentrated and can progress rapidly.
Metallurgical Relevance & Welding Risks
Crevice corrosion can lead to local wear problems, cracks, and deformation. It affects the strength and service life of components. In severe cases, it can lead to complete scrapping.
Workshop Practice & Instructions
To avoid crevice corrosion, it is important to thoroughly clean the surface and protect it before welding. Use suitable protective agents such as paint or spray oil. Ensure all gaps and crevices are closed. If corrosion exists, remove it carefully by mechanical polishing or chemical cleaning.