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Questions tagged [metallurgy]

Chemical and physical characteristics of metals and alloys.

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Etching stainless steel

I need to etch some stainless steel for a project. I found some instructions that only require household chemicals (it's kind of hard to acquire chemicals here). It required 30% HCl and 3% H2O2. I ...
Hristos's user avatar
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1 answer
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Would it be possible to form dense metal using a sol gel technique?

I was trying reduce some silver salt AgNO3 into elemental metal by thermal reduction I mixed it with citric acid and formed a solution and poured it into a circular cap (makeshift mould) and what I ...
assasinchop7's user avatar
-4 votes
1 answer
31 views

How do I create a highly conductive vapor cloud [closed]

I'm working on a project that requires that I create an electrically conductive gas cloud that can conduct voltages as low as 1.5v from a regular double A battery. I've been looking into using mecury ...
TechDroid's user avatar
5 votes
0 answers
215 views

Which alloy forms the thinnest sulfide surface passivation layer?

Metal sulfides seem to often form thick layers on alloy surfaces exposed to molten $\ce{S}$. Are there alloy surfaces capable of passivation with $\ce{S}$ before the layer thickness reaches $\pu{1 nm}$...
Paul Kolk's user avatar
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75 views

Electrolyte in Electrolysis of CuSO4 [closed]

I have 2 questions regarding electrolyte used in electrolytic refining of copper: I was reading metallurgy of copper and I noticed that in electrolytic refining we use acidified aqueous $\ce{CuSO_4}$ ...
Amit's user avatar
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1 answer
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Is 304 stainless steel an appropriate choice for making a tin/lead solder pot?

Are 304 stainless steel plates suitable for making a tin/lead melting pot operating at 300 °C or 572 °F? My concern is that the liquid alloy could form a kind of amalgam on the surface of the steel, ...
Daniel Bonadio's user avatar
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0 answers
23 views

Are there any yellow ferrous (ideally stainless) alloys? Perhaps after heating?

I recently learned about purple gold, which is roughly 80%-20% Au - Al by weight. (It's beautiful.) I also know that Titanium will turn bright purple if heated sufficiently (probably an oxide layer). ...
L. Jones's user avatar
14 votes
4 answers
3k views

Does molten metal liquid chromatography exist?

Liquid chromatography is used to analyze and purify different chemical samples in a solvent. It is also used for industrial scale chemical purification. I was wondering if something similar exists for ...
ericnutsch's user avatar
2 votes
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56 views

High-temperature interactions with salts on nichrome wire

I'm working on creating aluminium-doped zinc oxide (AZO) thin films, but instead of the usual glass substrate, I want to try this on a fine nichrome wire. I'm using a mix of zinc acetate $\ce{Zn(...
Thomas Pluck's user avatar
2 votes
0 answers
30 views

Is heat treatment the only way to increase grain size in steel?

Heat treatment is a well-established method for increasing grain size in steel. Is there any other approach known to man? I cannot seem to find anything via web search.
artist_and_not_EE_by_training's user avatar
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1 answer
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If gold does not oxidise in air, why doesn't it reform it's lattice?

It is a common fact that without oxidation, a metal can reform it's lattice with a tad bit of pressure. Gold is often said to be non-oxidising(doesn't oxidise in ambient temperature and pressure) and ...
Sid N's user avatar
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What are disadvantages of methane or ammonia compared to dihydrogen for metal ore reduction?

Metallurgy, such as steel-making processes, require reducing agents to get rid of the oxygen in metal ores. Using fossil coal for this is a large source of $\ce{CO2}$ globally. Recently, I have read a ...
tobalt's user avatar
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5 votes
1 answer
633 views

Why I am unable to see any electrical conductivity in Permalloy nano powders?

We recently purchased some permalloy nano powders (Ni80Fe70Mo3) I checked the electrical conductivity of these powders using a multimeter which can measure resistance to the order of giga ohm's. I was ...
assasinchop7's user avatar
0 votes
1 answer
79 views

Malleability and Ductility Origins [closed]

Malleability and Ductility are both properties of metals. I have learnt that lead is malleable but not ductile. However, don't these properties both arise from metallic bonds? So how can a substance ...
Stark's user avatar
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Does anybody know anything about this patented, late-19th-century process for producing white lead?

I debated on whether to put this question in the History or Engineering Stack Exchange. Ultimately, I decided on the Engineering Stack because I believe the people on this site will understand the ...
Curious Layman's user avatar
-1 votes
1 answer
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Is it necessary criteria that we draw Ellingham diagram for only one mole of oxygen consumed for a given reaction

In my textbook and many other reference text shows Ellingham diagram for only one mole oxygen consumed. Why is this done?
Kumar Priyanshu's user avatar
-4 votes
1 answer
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Are zinc & copper extracted from its ore using cyanide salt?

In my textbook, the extraction of Zinc is done from $\ce{ZnS}$ and copper from Cuprous oxide, so neither of extracting procedures involve the use of $\ce{CN^-}$ salts. Thinking further, both Zn(II) ...
I.Bedi's user avatar
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Finding chromium

If I were to go back in time to pre-industrial Earth, and I wanted to make stainless steel, would there be a way to find chromium and/or chromite? It doesn't matter what chemical form the chromium ...
Jim Clay's user avatar
0 votes
1 answer
107 views

Is electrode reduction potential dependent on the nature of the solution(the reagents of the solution) it's dipped in?

I'm undergrad student majoring in materials science and engineering. I faced this question while studying for a course named "surface engineering of materials". This slide is a part of my ...
S M Plaban's user avatar
-5 votes
1 answer
192 views

Determine if particles are aluminium oxide

I am getting a white dust in my car, coming from the air vents and landing all over, mostly on the dashboard. After searching about this, it seems that it could be caused by the fins of the air ...
Magnus's user avatar
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How is decarburisation achieved during Electric Arc Furnace steelmaking?

In the basic oxygen process, steel is made from pig iron (having a high carbon content) by oxidising the carbon with a high-pressure oxygen lance. In an EAF, steel is made mostly from scrap, but it ...
Boris Mulder's user avatar
4 votes
1 answer
216 views

Why does cold welding not work with carbon steels?

Cold welding is the process of joining metals using pristine surfaces without contaminents(oxide layers, oil, dust...) using pressure through atomic diffusion between the metal joints. Why does this ...
Andi Iacob's user avatar
0 votes
1 answer
87 views

Why does FCC crystalline forms form hexagonal crystalline structures during CVD?

During the CVD process, Copper and Nickel which are both Face Centered Cubic crystalline structures are used as substrates for shaping hexagonal atomic structures such as graphene and hexagonal Boron-...
Andi Iacob's user avatar
1 vote
0 answers
38 views

Why does the Gallium-Aluminum Reaction Happen? [duplicate]

There a plenty of videos online of a small gallium sample being placed on a large aluminum sample, resulting in the former being absorbed by the latter and forming an extremely brittle alloy. What I ...
E Tam's user avatar
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0 votes
2 answers
43 views

Can metals have both Fracture Toughness and Elasticity properties? [closed]

Fracture Toughness is the resistance of a material to cracking and Elasticity is the ability to bend without breaking. I want to know if there is any metal or metal alloy that can easily bend without ...
adrian bagherpour's user avatar
-2 votes
1 answer
212 views

Why is silver considered a "type 1" metal although it has multiple oxidation states? [closed]

I noticed that the metals I learned were "type 1" back in early chemistry class as they have one oxidation state including silver, aluminum, zinc, and cadmium. However, those metals weren't ...
Andrew Fernandez's user avatar
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0 answers
85 views

Separate aluminium from brass threaded bushing without affecting the brass

I wanted to separate aluminium from brass threaded bushing without affecting the brass. I also suppose that brass isn't the brass but it's a phosphor bronze. Does brass and phosphor bronze amalgamate ...
Malum Wolfram's user avatar
0 votes
2 answers
724 views

Which gases(or gas) are evolved in the leaching of Galena(PbS) with conc. Nitric acid? [closed]

I want to know the gases produced(primarily nitrogen oxides) in leaching of Galena in nitric acid and the effect of concentration of nitric acid on the gases evolved. I found papers about the ...
Ayush Kumar's user avatar
1 vote
1 answer
120 views

Is anodizing of mixed metals (aluminium and cooper) possible?

I'd like to blacken my Noctua NH-P1 passive cooler, made from an aluminium fins and copper heatpipes. Since thermal dissipation is key in my build, I thought about anodizing it, instead of spray paint ...
Raymond Osterbrink's user avatar
1 vote
0 answers
310 views

Calculating pourbaix diagram of Fe-H2O system at different temperatures

I have been trying to calculate the pourbaix diagram for Fe-H2O at different temperature for my high school research but I am facing a lot of problems. I have several question regarding the ...
Rajshibhu Pandey 's user avatar
-2 votes
2 answers
273 views

What is the reason for extracting copper from copper pyrites and not iron?

Why can copper be extracted from copper pyrites ($\ce{CuFeS2}$) but not iron? Is there some intuitive logic behind it?
Abhiram Cherukupalli's user avatar
4 votes
1 answer
121 views

Gold cyanidation process

My chemistry book says the following: In the metallurgy of silver and gold , the respective metal is leached with a dilute solution of $\ce{NaCN}$ in presence of $\ce{O2}$ as a result of which the ...
Arpan's user avatar
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-1 votes
1 answer
64 views

Can a plain sheet of stainless steel adhering to the 316 grade be regarded as food safe at every finish level?

My question is not purely about chemistry but it definitely involves it. I was looking for a while to buy a food-grade stainless steel plate that would fit my home pizza gas oven (to have the dough ...
TLSO's user avatar
  • 147
4 votes
1 answer
673 views

Ellingham diagram/graph for tungsten

I've recently come across one of the methods to form tungsten carbide($\ce{WC}$) from wolframite ($\ce{(Fe,Mn)WO4}$) by using carbothermic reduction which was supposedly one of the first methods for ...
kafka yash's user avatar
0 votes
1 answer
69 views

Aluminum Alloy with most alkaline resistance [closed]

Previously i asked this question in Engineering SE: What aluminum grade is the most resistant to corrosion in alkaline environment? Some input from others seem indicating that no mass-produced ...
poalsd's user avatar
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0 votes
0 answers
39 views

How to determine the visual properties of a specific steel compound?

The material that is described in a paper by Li et. al.[1] is interesting to me, but they don't go into any details on what the end result would look like visually. Out of curiosity, I was wondering ...
Delta's user avatar
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1 vote
1 answer
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How to Improve Phosphoric Acid 85% leaching of Natural Titanium Rutile without increasing impurity?

Using magnetically separated natural titanium rutile from a mine in South Africa to leach titanium for oxide production using H3PO4 85%. (The reason for using H3PO4, is that it separates out any Fe ...
JayBase's user avatar
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1 vote
1 answer
78 views

Dehydrating hydrated Magnesium chloride

I came to know that hydrated Magnesium chloride $\ce{MgCl2.6H2O}$ is dehydrated not directly by heating as it gets hydrolysed to $\ce{MgO}$ . But instead it is dehydrated by passing through $\ce{HCl}$ ...
WHOOP's user avatar
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4 votes
0 answers
46 views

The role of 2-nitrophenol in tin etchant (aqueous mixture of 2-nitrophenol and NaOH)

Aqueous mixture of 2-nitrophenol and NaOH is a time-honored etchant that dissolves tin-rich alloy and retain the intermetallic compounds from the tin. I wonder the role of 2-nitrophenol in the etching ...
5ru8ek's user avatar
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12 votes
3 answers
2k views

How can steel be so different from iron, even if amount of carbon is small?

Perhaps I am too naive, but I am having a hard time visualizing how even 'high-carbon' iron and steel alloys are maybe, at most, about four percent carbon by mass, which still means only one (smaller) ...
Kurt Hikes's user avatar
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1 vote
0 answers
239 views

Natural preservatives of ink

Would pure compounds like thymol, carvacrol, and cinnamaldehyde work as preservatives of fountain pen ink? I'm specifically interested in three properties - Prevention of growth (mostly fungal) in ...
Inkman's user avatar
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1 vote
2 answers
1k views

Extraction of copper from chalcopyrite

During the extraction of copper from chalcopyrite ore, the ore ($\ce{Cu2S.Fe2S3}$) is heated to form $\ce{Cu2S}$ and $\ce{FeS}$. Then during smelting it reacts with $\ce{O2}$ to form $\ce{Cu2O}$. Then ...
Siddhartha Mondal's user avatar
1 vote
1 answer
378 views

Why do mineral particles become wet by oils while the gangue particles by water?

In my textbook, NCERT Chemistry for class 12, it is mentioned that one of the principle of froth floatation method is the following: The mineral particles become wet by oils while the gangue ...
Babu's user avatar
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4 votes
1 answer
381 views

Why is the term "nascent nitrogen" still used in metallurgical industries?

Continuation of Why do nitrogen-containing organic compounds give N2 as the combustion product? (comment converted into question) Nascent state is an obsolete theory in chemistry and is discredited. ...
Nilay Ghosh's user avatar
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8 votes
2 answers
1k views

How to separate Cu and Ni from alloy containing different metals such as Al, Cu, Ni, (Zn, Pb, Sn < 5%)?

I have an alloy containing different metals such as Al, Cu, Ni, (Zn, Pb, Sn, Ag, Si in small amount < 5%). How can I separate Cu and Ni from this alloy? I tried to dissolve alloy in sulfuric acid, ...
Dhruvin's user avatar
  • 99
0 votes
1 answer
602 views

Why is the only natural source of radium compounds uranium minerals?

A common mineral of barium is barytes, or barium sulfate ($\ce{BaSO4}$). Because elements in the same periodic group have similar chemical properties, we might expect to and some radium sulfate ($\...
Akhil Kumar Singh's user avatar
1 vote
1 answer
235 views

What is the alloying composition of the Zinc-Platinum System?

My research team and I are working on a bimetallic alloy consisting of Zinc and Platinum. We have looked for papers regarding the composition of Zinc-Platinum alloy. But there aren't many papers out ...
isentropic compression's user avatar
-1 votes
1 answer
1k views

Why same metal salt is required in electrolytic refining?

Why we use same metal salt in electrolytic refining? Ex. For $\ce{Cu^2+}$ if we take suppose $\ce{FeSO4}$ so there are 2 ions ready to react on cathode ie $\ce{Fe^2+}$ and $\ce{Cu^2+}$. But from a ...
Anshika singh's user avatar
3 votes
1 answer
850 views

Why is the formation free energy of carbon dioxide almost constant in Ellingham diagrams?

While reading about Ellingham diagram in my textbook, I noticed that for: $\ce{C_(_s_) + O2_(_g_) -> CO2_(_g_)}$, the standard Gibbs free energy ($\ce{\Delta_fG^\circ}$) doesn't seem to vary with ...
Pal's user avatar
  • 549
2 votes
1 answer
262 views

Why are calcination and roasting processes carried out at a temperature just below the ore's fusion temperature?

I had read about the two important methods used for the concentration of an ore - Roasting and Calcination. I have a doubt regarding why both the methods are carried out at temperatures not above the ...
Pal's user avatar
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