Which metals undergo differential aeration corrosion?

In summary, iron is more susceptible to differential aeration corrosion due to its ease of oxidation, while zinc and aluminium are protected by their passive film.
  • #1
Bohr1227
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Hi, I am trying to learn about different types of corrosion. I have read that iron can undergo differential aeration corrosion, but not zinc and aluminium. I do not see why...both can be reduced by oxygen and both have a passive film. Can somebody explain why?

Thanks
 
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  • #2
for asking! Differential aeration corrosion is the result of a difference in oxygen concentration between two areas on a metal surface. Iron is particularly prone to this type of corrosion because it is easily reduced and oxidized by oxygen. Zinc and aluminium, however, form a passive film when exposed to oxygen. This film acts as a barrier and prevents oxygen from diffusing through the metal surface and causing differential aeration corrosion.
 

What is differential aeration corrosion?

Differential aeration corrosion is a type of corrosion that occurs when two different areas of a metal are exposed to different levels of oxygen. This can lead to the formation of anodic and cathodic regions on the metal, causing it to corrode at a faster rate.

Which metals are most susceptible to differential aeration corrosion?

Some of the most commonly affected metals include iron, steel, and copper alloys. However, other metals such as aluminum, zinc, and magnesium can also undergo differential aeration corrosion under certain conditions.

What factors contribute to the occurrence of differential aeration corrosion?

The main factors that contribute to this type of corrosion are the presence of different levels of oxygen, the conductivity of the metal, and the presence of an electrolyte solution. Other factors such as temperature, pH, and the composition of the metal can also play a role.

How can differential aeration corrosion be prevented?

One of the most effective ways to prevent this type of corrosion is to use corrosion-resistant alloys, such as stainless steel or titanium. Other methods include applying protective coatings or using cathodic protection techniques. Proper maintenance and monitoring of environmental conditions can also help prevent differential aeration corrosion.

Is differential aeration corrosion a common issue in industrial settings?

Yes, differential aeration corrosion is a common issue in industrial settings, particularly in environments where different levels of oxygen are present, such as marine or coastal areas. It can also occur in industries that use electrolyte solutions, such as chemical processing or oil and gas production.

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