Crevice corrosion is a type of corrosion that occurs in confined spaces to which the access of the working fluid from the environment is limited. These spaces are generally called crevices. Examples of such locations include gaps and contact areas between parts, under gaskets or seals, inside cracks and seams, spaces filled with deposits and under sludge piles.

The attributes that can lead to crevice corrosion include:

1. Shielded areas on the metal surface: These are areas that are not directly exposed to the environment, such as under gaskets, seals, or deposits. These areas can create a localized environment that promotes corrosion.

2. Presence of two dissimilar metals: This can create a galvanic cell, where one metal corrodes preferentially when it is in electrical contact with another, in the presence of an electrolyte. This can accelerate corrosion in the less noble metal.

3. Formation of biofilm on metal surface: Biofilms can create a localized corrosive environment, especially if they contain corrosive species such as sulfur-reducing bacteria.

4. Removal of paints/lacquers: Paints and lacquers are often used as protective coatings to prevent corrosion. If these are removed, it can expose the metal surface to corrosive environments and lead to crevice corrosion.

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Crevice corrosion is a type of corrosion that occurs in confined spaces to which the access of the working fluid from the environment is limited. These spaces are generally called crevices. Examples of such locations include gaps and contact areas between parts, under gaskets or seals, inside cracks and seams, spaces filled with deposits and under sludge piles.

The attributes that can lead to crevice corrosion include:

1. Shielded areas on the metal surface: These are areas that are not directly exposed to the environment, such as under gaskets, seals, or deposits. These areas can create a localized environment that promotes corrosion.

2. Presence of two dissimilar metals: This can create a galvanic cell, where one metal corrodes preferentially when it is in electrical contact with another, in the presence of an electrolyte. This can accelerate corrosion in the less noble metal.

3. Formation of biofilm on metal surface: Biofilms can create a localized corrosive environment, especially if they contain corrosive species such as sulfur-reducing bacteria.

4. Removal of paints/lacquers: Paints and lacquers are often used as protective coatings to prevent corrosion. If these are removed, it can expose the metal surface to corrosive environments and lead to crevice corrosion.

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Crevice corrosion is a type of corrosion that occurs in confined spaces to which the access of the working fluid from the environment is limited. These spaces are generally called crevices. Examples of such locations include gaps and contact areas between parts, under gaskets or seals, inside cracks and seams, spaces filled with deposits and under sludge piles.

The attributes that can lead to crevice corrosion include:

1. Shielded areas on the metal surface: These are areas that are not directly exposed to the environment, such as under gaskets, seals, or deposits. These areas can create a localized environment that promotes corrosion.

2. Presence of two dissimilar metals: This can create a galvanic cell, where one metal corrodes preferentially when it is in electrical contact with another, in the presence of an electrolyte. This can accelerate corrosion in the less noble metal.

3. Formation of biofilm on metal surface: Biofilms can create a localized corrosive environment, especially if they contain corrosive species such as sulfur-reducing bacteria.

4. Removal of paints/lacquers: Paints and lacquers are often used as protective coatings to prevent corrosion. If these are removed, it can expose the metal surface to corrosive environments and lead to crevice corrosion.

Which of the following attributes crevice corrosion? ans. Formation of biofilm on metal surface Removal of paints/lacquers Shielded areas on the metal surface Presence of two dissimilar metals

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