Crevice corrosion is a type of localized corrosion which occurs in confined spaces (crevices) where the access of the working fluid is limited. The corrosion process is often characterized by a positive feedback wherein the corrosion often starts at a defect (the crevice), the corrosion products build up, limiting further the access of the working fluid and exacerbating the corrosive conditions.

The attributes that can lead to crevice corrosion include:

1. Formation of biofilm on metal surface: Biofilms can create microenvironments that promote crevice corrosion. They can trap corrosive agents, like chlorides, and create a differential aeration cell, leading to corrosion.

2. Presence of two dissimilar metals: This can lead to galvanic corrosion, which can promote crevice corrosion. The less noble metal (anode) corrodes at an accelerated rate and the more noble metal (cathode) corrodes at a reduced rate.

3. Removal of paints/lacquers: Paints and lacquers act as protective coatings that prevent corrosion. Their removal can expose the metal surface to corrosive agents, leading to crevice corrosion.

4. Shielded areas on the metal surface: These areas are more prone to crevice corrosion because they can trap corrosive agents and moisture, creating a corrosive microenvironment.

Question

Crevice corrosion is a type of localized corrosion which occurs in confined spaces (crevices) where the access of the working fluid is limited. The corrosion process is often characterized by a positive feedback wherein the corrosion often starts at a defect (the crevice), the corrosion products build up, limiting further the access of the working fluid and exacerbating the corrosive conditions.

The attributes that can lead to crevice corrosion include:

1. Formation of biofilm on metal surface: Biofilms can create microenvironments that promote crevice corrosion. They can trap corrosive agents, like chlorides, and create a differential aeration cell, leading to corrosion.

2. Presence of two dissimilar metals: This can lead to galvanic corrosion, which can promote crevice corrosion. The less noble metal (anode) corrodes at an accelerated rate and the more noble metal (cathode) corrodes at a reduced rate.

3. Removal of paints/lacquers: Paints and lacquers act as protective coatings that prevent corrosion. Their removal can expose the metal surface to corrosive agents, leading to crevice corrosion.

4. Shielded areas on the metal surface: These areas are more prone to crevice corrosion because they can trap corrosive agents and moisture, creating a corrosive microenvironment.

Knowee AI · Accepted Answer

Crevice corrosion is a type of localized corrosion which occurs in confined spaces (crevices) where the access of the working fluid is limited. The corrosion process is often characterized by a positive feedback wherein the corrosion often starts at a defect (the crevice), the corrosion products build up, limiting further the access of the working fluid and exacerbating the corrosive conditions.

The attributes that can lead to crevice corrosion include:

1. Formation of biofilm on metal surface: Biofilms can create microenvironments that promote crevice corrosion. They can trap corrosive agents, like chlorides, and create a differential aeration cell, leading to corrosion.

2. Presence of two dissimilar metals: This can lead to galvanic corrosion, which can promote crevice corrosion. The less noble metal (anode) corrodes at an accelerated rate and the more noble metal (cathode) corrodes at a reduced rate.

3. Removal of paints/lacquers: Paints and lacquers act as protective coatings that prevent corrosion. Their removal can expose the metal surface to corrosive agents, leading to crevice corrosion.

4. Shielded areas on the metal surface: These areas are more prone to crevice corrosion because they can trap corrosive agents and moisture, creating a corrosive microenvironment.

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

Question

Solution

Similar Questions

Upgrade your grade with Knowee