Question

Filiform corrosion occurs independently of light, metallurgical factors, and microorganisms present. It takes place when the relative humidity of the air is 78 to what percent and when the surface is slightly acidic?

Answer 1

Filiform corrosion occurs on metal surfaces under high relative humidity (about 78% and above) and slightly acidic conditions. It can propagate under coating like paint, worsened by factors like scratches that expose the metal to oxygen and moisture.

Step-by-step explanation:

Filiform corrosion is a type of corrosion that can occur on metal surfaces, particularly when the relative humidity of the air is high. It can initiate and propagate under a coating such as paint, leading to a worm-like pattern of corrosion. This type of corrosion happens when the relative humidity is around 78% or above and when the surface environment is slightly acidic. It is essential to protect metals from filiform corrosion through proper coatings and by minimazing exposure to the conditions that favor its development.

Various factors like scratches in paint or protective coatings can expose the metal to oxygen and water, fostering an electrochemical process that contributes to the corrosion.

Filiform corrosion occurs when the relative humidity of the air is 78% and the surface is slightly acidic. It is a form of corrosion that happens independently of light, metallurgical factors, and microorganisms present. This type of corrosion can occur in various environments, including marine, industrial, and automotive settings.