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Questions tagged [corrosion]

For questions about the process of corrosion or protection of metals from corrosion.

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How Can I Induce Corrosion Electrochemically?

I'm very interested in measuring corrosion in metal alloys, particularly in salt solutions. I understand metals corrode over time, however, I was wondering if it's possible to electrochemically "speed ...
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Is an alcohol-based spray cleaner ok for cleaning an aluminum heat exchanger?

Simple alcohols such as ethanol can, apparently, corrode aluminum. However, this corrosion reaction seems to be very slow at room temperature and below. Is an ethanol based, non-foaming spray cleaner, ...
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Can ZnO act as a reducing agent for noble metals like Pd?

Palladium ions (e.g., $\ce{Pd^2+}$) can be reduced to $\ce{Pd}$ by more reactive metals such as zinc. Metal oxides such as $\ce{ZnO}$ are very stable but can its atoms in the oxide structure still be ...
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nickel-copper fabric: shielding viability after being subjected to weathering

I know the solution can be as simple as a well-sealed garbage can, but I am contemplating making a more malleable fabric based faraday-cage-esque contraption. The plan is to use nickle-copper fabric ...
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Why galvanic corrosion by sulphuric acid has a whitish appearance?

This is a picture of pearlitic cast iron engine liner which was corroded from the presence of sulphuric acid on the combustion products. What is the cause of the whitish appearance?
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Why does acidic medium accelerate rusting?

When learning about the corrosion of iron, I was teached that the following half-reactions happen: $$ \ce{Fe -> Fe^2+ + 2e- } $$ $$ \ce{2H2O + O2 + 4e- -> 4HO-} $$ First question is: do these ...
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Choosing electrodes for corrosive environments

Background I'm building a watering robot for my household plants. For the purpose of measuring the moisture content of the plant I intend to use a resisitive approach where I pass an electric current ...
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How come when it rusts iron can undergo oxidation without the prescence of a another metal to undergo reduction?

It seems to me rusting is an electrochemical process where oxygen, which has particularly high electronegativity, fills the role of cathode or is that an incorrect way to put it?
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What material electrode is best suited for high current density aqeuous Bromide electrolysis?

I have found that the anodic breakdown potential of Titanium in the presence of Bromide ions is around 1 volt - too low for practical application. Tantalum sounds much more promising when considering ...
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Agar gel vs aqueous solution

Can someone tell me why - in experiments to observe corrosion of iron nails - we often use a preparation of agar gel (with $\ce{NaCl}$, phenolphthalein, etc.) instead of an aqueous solution?
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Will an iron nail sunk in a highly concentrated salt solution rust?

Assume I have a salt solution with the same concentration as the dead sea and I put a iron nail into the solution (assume it sinks). Will it rust? If yes, why? If no, why not?