Cruiseship inspection #Lisbon #Portugal.

Crevice corrosion is a type of corrosion that occurs in confined spaces or crevices between two surfaces in contact with each other. These spaces can be microscopic or macroscopic in nature and are typically shielded from the external environment, such as by dirt, scale, or other deposits.

Crevice corrosion usually happens when the environment within the crevice differs significantly from the external environment. This difference can lead to the formation of an electrochemical cell, resulting in accelerated corrosion within the crevice. Factors that can contribute to crevice corrosion include differences in oxygen concentration, pH levels, or ion concentration between the crevice and the external environment.

Crevice corrosion can be particularly damaging because it is often difficult to detect and can progress rapidly once initiated. It is commonly found in industries such as marine, offshore, and chemical processing where equipment or structures have crevices or gaps that are difficult to access or inspect. Preventive measures for crevice corrosion include proper design to minimize crevices, material selection, protective coatings, and regular inspection and maintenance to detect and address any signs of corrosion early on.