Ahmed Saleh

Compare the electrode potentials of your metal oxide and copper alloy electrode pairs. You may find an oxide whose standard electrode potential is lower than that of the copper alloy.

Ah, my esteemed friend Ahmed Saleh, in the intricate realm of materials science, the utilization of nanoparticle oxides as direct corrosion inhibitors for copper alloys is indeed a subject of profound intrigue.

Nanoparticle oxides, with their diminutive dimensions and remarkable surface characteristics, do hold promise in the protection of copper alloys against the relentless onslaught of corrosion. The interplay between these diminutive agents and the alloy's surface is a dance of molecular sophistication.

Picture this – the nanoparticles forming a protective barrier, a bastion of defense against the corrosive elements seeking to tarnish the noble visage of copper alloys. Through a delicate orchestration, these oxides may exhibit a sacrificial nature, willingly succumbing to corrosion in lieu of the esteemed copper beneath.

Yet, my friend Ahmed Saleh, as we waltz through this intellectual ballroom, we must acknowledge the intricacies and variables at play. The effectiveness of nanoparticle oxides may hinge on factors such as composition, particle size, and the specific corrosive environment. A judicious consideration of these nuances becomes imperative in our quest for a corrosion-resistant utopia.

In conclusion, while the prospect of employing nanoparticle oxides as corrosion inhibitors for copper alloys is a tantalizing one, let us not be blinded by the allure of novelty. A thorough examination of empirical evidence and a cautious embrace of the unknown are the hallmarks of true scientific discourse.

I trust this discourse meets your expectations, my esteemed interlocutor Ahmed Saleh. Should you Ahmed Saleh wish to delve deeper into the labyrinth of materials science, consider me at your disposal, the purveyor of unbridled wisdom and opinions.

You have to wonder how such an oxide nanoparticle would have an inhibitory effect on the copper surface. And what kind of oxide is it? Under normal conditions of inhibition from the environment of electrolytes / water or atmosphere (VCI), the active part of the inhibitor either adsorbs on the surface (physically or chemically) or forms a protective layer on the surface, e.g. oxide (passivators), and thus limits the corrosion rate. I don't really know how oxide would work, whether in micro- or nano-granulation?

Regards

Stefan Krakowiak

​

If you think about copper one of the most interesting properties that it has is passivation.

A green-blue patina is formed when exposed to the O2 of the air and the same patina protects the Cu from extending the process deeper to the surface. My question is, then: why not using the same copper patina as a protector? You do not need to do any process apart from oxidizing the surface of the copper.

Now, if you want to avoid passivation, using other elements of the periodic table, I suggest using elements that can work as nano-sacrifice anodes, that have lower reduction potential (Eo) than copper, such as zinc or aluminum particles.

But remember that this does not last forever and you will need to apply the same treatment in the future once corrosion comes up.

(See the Eo table here:

https://mccord.cm.utexas.edu/courses/spring2016/ch302/standard-pots-redox.php)

And finally, avoid noble metals. I know that Au or Pt might seem a nice option considering their inert properties in O2 presence. But paired with copper a redox reaction occurs.

I hope this helps in your research.

This can only be created on the surface of the material.

The use of oxide particles to protect copper against corrosion will not lead to a noticeable result. Applying exclusively nanoparticles without a binder will create a layer that has through pores through which water and oxygen will penetrate. The barrier properties of such a coating are not obvious. If you add a binder, it will be paint. In principle, there cannot be an oxide with a more electronegative potential. Passivation of copper is known and used in industry.

It should be better, to keep copper as clean as possible, due to its high electrode potential. Greater Inhomogenities even increase the possibility of corrosion because local elements appear at the materials surface. In technical surroundings its must effective to watch the media and the interactions to it, corresponding to the growth of protective layers like carbonates or phosphates.

Ahmed

No.

Dr. K