What type of corroding material is this?

In summary, the structure in question appears to be made of steel and coated with paint to prevent corrosion. The mesh is likely made of expanded metal, possibly steel, and the dark corrosion product could be magnetite with a spinel component. The type of corrosion it is undergoing is possibly uniform, galvanic corrosion with some pitting and crevice corrosion at the edge of the paint. The presence of aluminum in contact with the post could also contribute to galvanic corrosion. It is not clear if the post is galvanized.
  • #1
uzman1243
80
1
Hi,

So I was thinking about corrosion and I came across this structure:
attachment.php?attachmentid=69664&stc=1&d=1399781340.jpg


Do you think the inner metal/alloy that is corroding is steel?

Also, what do you think the outer layer (in white) is? perhaps the metal is just coated with paint to avoid corrosion?

Finally, what type of corrosion do you think its undergoing? General Corrosion, Galvanic corrosion, uniform corrosion and so on.
 

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  • #2
The mesh seems to be expanded metal, possibly made of a steel, e.g., 1008. The white covering seems to be paint. It's possible that the post is steel. The dark corrosion product could be magnetite, perhaps with a spinel component.

Is the post galvanized?

It is possibly uniform, galvanic corrosion with some pitting and some crevice corrosion at the edge of the paint. If there is aluminum in contact with the post, then that would drive galvanic corrosion.
 

What type of corroding material is this?

1. What are the common types of corroding materials?

The most common types of corroding materials include metals such as iron, steel, copper, aluminum, and their alloys.

2. How can I determine the type of corroding material?

The type of corroding material can be determined by conducting a visual inspection, chemical analysis, or using specialized techniques such as X-ray diffraction or scanning electron microscopy.

3. What factors contribute to the corrosion of materials?

Some of the main factors that contribute to the corrosion of materials include exposure to moisture, oxygen, salt, and other environmental contaminants, as well as the type of material and its chemical composition.

4. Can different types of materials corrode each other?

Yes, different types of materials can corrode each other if they come into contact and create a galvanic cell. This occurs when two dissimilar metals are in contact, causing one metal to corrode more quickly than it would on its own.

5. How can I prevent or slow down material corrosion?

There are several methods to prevent or slow down material corrosion, such as using protective coatings, proper material selection, cathodic protection, and regular maintenance and inspection.

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