【Corrosion Technology Edition】Daily Question 20170726: What is crevice corrosion?
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Crevice corrosion: Many metal components are connected using screws, rivets, welding, etc. Narrow gaps can form at the defects in these connections or weld joints; the width of such gaps (usually between 0.025 and 0.1 mm) is sufficient for electrolyte solutions to enter. This allows the metal inside the gap to form a short-circuited galvanic cell with the metal outside the gap, resulting in severe localized corrosion within the gap. Chinese Name
Local corrosion that is more severe than that in exposed areas often occurs in the gaps of metal components and other concealed areas, a phenomenon known as crevice corrosion.
Many metal components are connected using screws, rivets, welding, and other methods, and narrow gaps can appear at defects in these connectors or weld joints. Its gap width (generally between 0.025 and 0.1 mm) is sufficient for the electrolyte solution to enter, allowing the metal inside the gap and the metal outside it to form a short-circuited galvanic cell; intense corrosion occurs within the gap, and this type of local corrosion is known as crevice corrosion.
Corrosion that occurs in the gap between the two connectors
Local corrosion that is more severe than that in exposed areas often occurs in the gaps of metal components and other concealed areas, a phenomenon known as crevice corrosion.
Corrosion of metal within gaps that form on its surface due to the presence of foreign substances or structural reasons, which makes it difficult for corrosion-related substances in the solution inside those gaps to migrate, is known as crevice corrosion
Crevice corrosion: Many metal components are connected using screws, rivets, welding, etc. Narrow gaps can form at the defects in these connections or weld joints; the width of such gaps (usually between 0.025 and 0.1 mm) is sufficient for electrolyte solutions to enter. This allows the metal inside the gap to form a short-circuited galvanic cell with the metal outside the gap, resulting in severe localized corrosion within the gap.
Crevice corrosion is a type of corrosion that occurs in the gaps between two connected elements. This localized corrosion can arise in gaps between metals joined together by methods such as riveting or bolting, in gaps between metals and non-metals, as well as in gaps formed between deposits on a metal surface and the metal surface itself. Crevice corrosion is caused by the difficulty of material movement between the media inside and outside the crevice. To this end, the width of the gap should be narrow enough. Its development is also a autocatalytic process within a closed system.
Many metal components are connected using screws, rivets, welding, and other methods. Narrow gaps can form at the defects in these connections or weld joints; the width of such gaps (usually between 0.025 and 0.1 mm) is sufficient for electrolyte solutions to enter. This allows the metal inside the gap to form a short-circuited galvanic cell with the metal outside the gap, leading to severe corrosion within that gap. This type of localized corrosion is known as crevice corrosion
Corrosion of metal in gaps, which occurs due to the presence of foreign substances or structural factors on the metal surface, resulting in difficulties in the migration of corrosion-related substances within those gaps, is collectively referred to as crevice corrosion