16
votes
How can steel be so different from iron, even if amount of carbon is small?
One of the key considerations is that much of the interesting mechanical behaviour doesn't occur within the bulk of the material - it occurs at the interfaces between crystals (known as grains). Grain ...
13
votes
Accepted
Can hydrogen peroxide reduce ferric ion to ferrous ion?
You are right. This question is "practically" incorrect, although on paper it might appear so if someone is unaware of real chemistry (the question setter). Iron (II) will readily ...
- 41.6k
11
votes
Accepted
Do I need to 'neutralise' iron/steel/metal with a base after removing rust with acid?
You might want to migrate this question to Motor Vehicle Maintenance and Repair SE for a more practical and less theoretical range of answers.
That being said, plain water is sufficient for rinsing ...
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11
votes
Where does the energy required to initially begin the reaction of iron and oxygen come from?
Do all reactions initially require a input of energy?
Yes, it is called activation energy. When you say "initially required", it does not mean just when the overall reaction starts. Each ...
- 41.2k
9
votes
How can steel be so different from iron, even if amount of carbon is small?
Elastic deformation properties like stiffness (Young's Modulus) vary very little with alloying element concentration since we are only working on the pre-yield bond strength. A pure iron, a carbon ...
- 239
9
votes
Accepted
How is there still iron on earth?
You may confuse iron(1) as an element and iron(2) as the metallic form of iron(1). Rusting of iron(2) does not destroy iron(1), but converts it to iron(1) compounds like non-stoichiometric hydrated ...
- 42.7k
8
votes
How can steel be so different from iron, even if amount of carbon is small?
Let's consider that steel may contain $\pu{1\%}$ carbon. I know it is a bit much. Let us express this mass concentration as molar concentration for a sample of $\pu{100 g}$ of steel. Since this sample ...
- 29.2k
8
votes
How is there still iron on earth?
You have it backwards. For about 2000 years people have taken iron oxides (primarily) and converted them into metallic iron and steel. So there is dramatically more metallic iron on the earth surface ...
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7
votes
Does Fe(CO)6 really exist?
There is an iron hexacarbonyl, not as a neutral compound but as a dication which satisfies the 18-electron rule. This along with its heavier Group 8 congeners is reported by Finze et al. [1]. The ...
- 60k
6
votes
Do I need to 'neutralise' iron/steel/metal with a base after removing rust with acid?
Apparently you mean the interior? The reaction of sodium bicarbonate with acetic acid is very rapid, slosh it around then pour it out. Being damp it will tend to get a very thin rust on it quickly ...
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5
votes
Accepted
How can warm steel and wood merge together?
A common press fit , no chemistry involved. Most commonly used for files (in US). All my files (old) use this same press fit, I believe newer files have plastic handles. The use of heat to custom ...
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5
votes
Do I need to 'neutralise' iron/steel/metal with a base after removing rust with acid?
Rust is a spot phenomena. It does not proceed on the whole surface of iron and steel plates. Rust starts at and around surface microcrystals of "impurities". When started, it goes on around ...
- 29.2k
5
votes
Accepted
What kind of defects can I find in a knife made of high-carbon steel with a wooden handle?
Wet mag would be best to examine for mechanical defects. Similar to dye pene but with fluorescent indicator and a magnetic field.. Usually done under UV light. Zyglo is one brand I recall. That will ...
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5
votes
Accepted
Purifying ferrous sulfate
You better make your turbid solution boil with some iron wires $\ce{Fe}$ and a bit of sulfuric acid. The turbidity observed in your solution is due to a mixture of two precipitates containing $\ce{Fe^{...
- 29.2k
5
votes
Accepted
Redox titration, complex formation effect on lg'K?
I suspect the primary source for the error (≈10%) you are encountering between your calculated $K'$ value and the theoretical $K$ value is the deviation of the molar equilibrium concentrations of $\ce{...
- 1,749
5
votes
Why do we have to prevent the hydrolysis of iron(III) nitrate?
If not adding it (nitric acid), does it affect our concentrate solution later?
Yes it does because slow hydrolysis with water, some $\ce{Fe^3+}$ would separate out from the solution as solid ...
4
votes
Accepted
Forcing a steel pipe to rust completely
As we in the trade say "rust never sleeps". Rust develops on the surface , rust is somewhat protective in some "weathering" steels such as Corten. Small additions of Cu ,Cr, and P ,...
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4
votes
Are those magnetic iron filings in the dirt pure iron?
More likely they were iron oxides. In moist soil ,iron/steel filings would not last more than a few weeks before turning to oxides. Now the "oxides" are not simply Fe O, Fe 2 O 3, Fe 3 O 4 , ...
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4
votes
Accepted
Colour of ferrous hydroxide crystal
All your tubes show a strong air oxidation, as the stuff deposited in the higher part of the tubes above the liquid is a brown powder, made of $\ce{Fe(OH)3}$ and due to a complete oxidation of $\ce{Fe(...
- 29.2k
3
votes
How can I make a lot of microscopic rods of metal?
Here is a relevant 2013 paper: Synthesis of pure iron magnetic nanoparticles in large quantity, to quote:
Free nanoparticles of iron (Fe) and their colloids with high saturation magnetization are in ...
- 5,582
3
votes
Easiest/Fastest way to obtain a good quantity of fine Iron powder?
A less laborious path to very fine iron dust (in fact, likely pyrophoric iron) perhaps follows from first purchasing or preparing iron(II) oxalate (a path is detailed in a reference provided below). ...
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3
votes
Where does the energy required to initially begin the reaction of iron and oxygen come from?
When Iron is left outside, overtime it reacts with oxygen to form Iron
Oxide or rust. But how does the oxygen react with Iron, isn't Iron
held together by strong metallic bonds.
Let's forget about ...
- 41.6k
3
votes
Where does the energy required to initially begin the reaction of iron and oxygen come from?
Rust is a punctual phenomena. It happens on the surface of an iron piece, but only if there is some conducting impurity (carbon grain for example) on this surface. If a drop of water falls on this ...
- 29.2k
3
votes
What other acids can replace hydrochloric acid in the production of galvanized steel?
Mill scale ( FeO , Fe3O4) is not rust, and is more tenaceaous, so remedies for rust will not necessarily remove it. Sulfuric is cheapest acid for mill scale removal. I assume hydrochloric is used ...
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3
votes
Why do we have to prevent the hydrolysis of iron(III) nitrate?
The Gist
As mentioned in the comments, we have to prevent the formation of aqua complexes of $\ce{Fe^{3+}}$ as these tend to hydrolyze:
$$\begin{multline}
\ce{[Fe(H2O)_{2n}(NO3)_{3-n}]^{n+}.(NO3^-)_n.(...
- 2,304
3
votes
Accepted
Why iron reacts with steam to give Fe3O4 not Fe2O3?
Quoted picture from Researchgate.net for Ellingham diagram for iron oxides and hydrogen:
On the diagram above, you can see equilibrium partial pressures (expressed as oxygen chemical potential} of ...
- 42.7k
2
votes
How can I have iron powder without a fast reaction with oxygen?
All is matter of how fine the powder is ( surface per mass ratio ) and what is the level of prior surface reaction with oxygen.
If the powder is very fine ( I mean very ) and the surface is "...
- 42.7k
2
votes
Trying to understand the chemistry in an iron carbon battery
Ions in solution
[OP] I understand that ferrous chloride dissociates in water to $\ce{Fe^2+}$ and $\ce{Cl-}$ ions.
Yes. The same goes for the iron(III) species.
[OP] I'm told that iron(II) ...
- 41.2k
2
votes
Feasibility question: Is the following presented chemistry leading to very dilute H2O2 with fast created radicals, effective H2O2?
So, for bleaching, stain removal,..., is this a viable project to examine?
You may recall that rust stains on clothes or surfaces are one of the worst stains in the world. It is very hard to remove ...
- 41.6k
2
votes
Oven safe dessiccant?
I like the suggested treatment suggested here which is to basically clean/scrub the pan, dry and coat with vegetable oil, invert the pan, place over aluminum foil on an oven rack and bake. To quote:
...
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