Does Corrosion Transfer from Coated Materials to Others?

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Discussion Overview

The discussion centers on the potential for corrosion from a coated stainless steel material to transfer or encourage corrosion in another material upon contact. It explores the implications of corrosion resistance in coatings, the nature of corrosion, and the interactions between materials.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant reports that a coated stainless steel sample showed corrosion on the coating but not on the base material, questioning if this corrosion could transfer to another material.
  • Another participant suggests that corrosion would need to transfer its cause to affect another material, drawing an analogy to wood spalting and its spores.
  • It is noted that oxides from the corroded coating could damage other surfaces, potentially promoting corrosion if protective layers are abraded.
  • One participant clarifies that while damage can occur, it does not equate to transferring corrosion itself, emphasizing the need for a protective layer to be compromised for corrosion to be encouraged.
  • There is speculation about the nature of the coated part, with thoughts on its function as a bearing and how corrosion could affect its interaction with other surfaces.
  • A participant concludes that more information is needed to determine the specifics of the interaction and its implications.

Areas of Agreement / Disagreement

Participants express differing views on whether corrosion can transfer or merely encourage corrosion in another material. The discussion remains unresolved, with multiple competing perspectives on the nature of corrosion and material interactions.

Contextual Notes

Limitations include the lack of detailed information about the coated material's properties and the specific conditions under which corrosion occurs. The discussion also depends on definitions of corrosion and the mechanisms involved in material interactions.

knight92
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I have tested stainless steel sample coated by a layer that claims to improve the hardness of the material without reducing corrosion resistance. After 72 hours of salt corrosion tests, I have found that there was corrosion. The corrosion was on the outside it did not travel beyond the coating layer and SEM analysis confirmed this. So say only the coating material experiences some corrosion and it improves hardness with no corrosion to the base material (Stainless Steel Sample).

If this corroded sample comes into contact with another material with no corrosion can it somehow transfer corrosion or encourage corrosion of the other material?
 
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I'm not a materials expert at all and am just talking off the top of my head, but I don't see how that could happen. It would have to transfer the CAUSE of the corrosion.

For example, in wood, there are spores that cause what is called "spalting" (vaguely similar to corrosion in metal) and you CAN under some conditions get a second piece to spalt by transferring the spores from the first to it, but you are transferring the CAUSE of the spalting, not the spalting itself.
 
Oxides are usually hard and can damage other surfaces they come in contact with. The damage may promote corrosion, especially if a protective layer is abraded.
 
montoyas7940 said:
Oxides are usually hard and can damage other surfaces they come in contact with. The damage may promote corrosion, especially if a protective layer is abraded.
Sure, but that's not "transferring corrosion". Oh, wait ... I see the OP also asked about encouraging corrosion, so I get the thrust of your response but you are not talking about just contact, you are talking about damaging the second piece's protective layer. That could be done just as readily with a non-corroded piece.
 
phinds said:
That could be done just as readily with a non-corroded piece.

The OP said a layer to improve hardness. I don't know but was thinking maybe his part is a bearing of some sort. If it remains smooth it does little or no damage moving along another hard surface. But if it corrodes the oxides won't be smooth and will have a grinding action on other parts it moves along.

No way to know without more information.
 

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