Questions tagged [corrosion]
For questions about the process of corrosion or protection of metals from corrosion.
70
questions
-2
votes
0
answers
21
views
Is stainless steel current collector is corroded by sodium perchlorate electrolyte solution? If yes then can you please explain
I used sodium perchlorate electrolyte solution for making cell and in my electrode I used stainless steel as a current collector and cellulose as a separator.when I m doing cyclic stability then the ...
1
vote
1
answer
223
views
Why are bases corrosive?
If I understand correctly, an acid corrodes things because the hydronium ion attracts electrons away from whatever it is reacting with. Do bases corrode things in a similar manner? with the metal ...
- 27
0
votes
1
answer
44
views
What materials can be used to store supercritical water
I am wondering which materials might be suitable to contain SCW (supercritical water). Here, we are assuming that the pressure is almost equal on the outside of the container than the inside. I have ...
- 103
-2
votes
1
answer
94
views
Creating Chloramines
I'm currently conducting some testing related to indoor pool environments.
Here I believe, airborne chloramines are responsible for stress corrosion cracking in austenitic stainless steels.
...
- 65
1
vote
1
answer
387
views
Galvanic corrosion between copper, silver, nickel, and chrome plated brass
My PC uses a custom liquid cooling loop, in the loop currently I have copper (purity not specified by the manufacturer), silver (Nickel/.925 silver) and nickel plated brass fittings (no specifics from ...
- 113
-2
votes
1
answer
331
views
What is causing rust-like stains on my stainless steel appliances? [closed]
Two weeks ago we discovered that our new Kohler faucet was leaking under the sink in our lanudry room adjacent to our kitchen. We shut off the water and have not used the sink. It apparently was ...
- 9
2
votes
0
answers
235
views
How can I accelerate iron corrosion in a way that simulates natural processes?
I am attempting to conduct a research project comparing the effect of various current levels on electrolytic rust removal. Somewhat ironically however, I need a way to induce corrosion in a ...
- 29
0
votes
0
answers
234
views
Are there any real dangers to using lead fishing sinkers to hold a shower curtain in place?
I am hoping someone can help me consider if there are any factors that would make the use of lead fishing sinkers such as these in the shower risky enough to stop doing it. Specifically, they are ...
- 101
1
vote
1
answer
800
views
Creating Oxalic Acid Gel for rust removal
While this question relates to an automotive application I consider that it is liable to be best asked on this site.
Summary:
I wish to create a low cost gel suitable for mixing with Oxalic acid to ...
- 281
0
votes
1
answer
42
views
Sacrificial Electrodes on a Car?
I know that sacrificial electrodes are used on outboard motors and in other marine applications to reduce or eliminate corrosion from salt water, etc. Could pieces of zinc be attached to an ...
- 1
7
votes
1
answer
6k
views
Creating resilient (non-brittle non-water-soluble) verdigris (blue-green copper patina)
First off, I checked and there are indeed a number of questions on copper patinas, but none which deal with resilience.
Context
I own a number of copper writing utensils, which I'd like to get a nice ...
- 457
3
votes
1
answer
240
views
Nichrome alloy corrosion at high temperature
We are currently using a nichrome (80/20) wire based heater to surround a sample chamber that we wish to heat by radiation. Maximum sample temperature is 400degC in an atmosphere of air that may be ...
- 1,672
2
votes
1
answer
328
views
How easily should 304 stainless steel dissolve in a salt and hydrogen peroxide solution?
This is a simple question, although I don't have any exact numbers.
I was looking to buy a food-safe stainless steel sieve, and one of the reviewers showed the sieve they purchased heavily rusted and &...
- 147
0
votes
1
answer
174
views
Why is nickel anticorrosive?
I've been looking into corrosion and common ways to prevent it. Pure nickel seems to be the main anticorrosive material to use, but I can't find a decent answer as to what it has/does that other ...
- 1
1
vote
0
answers
100
views
How does alkaline pipe cleaner corrode plumbing?
The siphon of my bathroom sink was clogged up again, and I became curious on why it clogged up so quickly each time. So I decided to open the pipe and was shocked to see the plumbing like this:
...
- 131
0
votes
1
answer
54
views
NiCr wire and water
Suppose I'm a very impatient person and I want to heat up water by getting rid of the layer of isolation between a NiCr wire and the water (e.g. skinny-dipping). The idea is that, since the wires can ...
3
votes
0
answers
85
views
Is hydrochloric acid or sulfuric acid more corrosive to titanium?
Which acid is more corrosive to titanium at 20 to 30 °C and similar concentrations: hydrochloric acid $\ce{HCl}$ or sulfuric acid $\ce{H2SO4}$?
I found some info on AZoMaterials — Titanium - Corrosion ...
- 131
2
votes
2
answers
5k
views
Corrosiveness of Deionized vs Distilled water for use in Laboratory Water Bath [duplicate]
I've read conflicting descriptions of the corrosiveness (or lack thereof) of very pure water. For a precision water bath, it's stated that one should fill the bath with distilled water rather than ...
- 31
1
vote
0
answers
317
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 ...
-1
votes
1
answer
64
views
Best material selection for a component containing hot saturated-level saline water with high chloride content (Polymer vs coated metal)
I have a component (Which can be seen as the attached file)
and inside the component, there would be hot saturated-level saline water with high chloride content (Not shown)
Considerations:
The ...
- 17
0
votes
3
answers
535
views
Does iron rust because of impurities found in it (ex. carbon)?
If we, theoretically, get a piece of ideally 100% pure iron and it is left in moist air? Will it rust? My understanding of iron rust is that the Iron itself becomes the ANODE and carbon impurities (as ...
- 21
7
votes
5
answers
4k
views
Do I need to 'neutralise' iron/steel/metal with a base after removing rust with acid?
I've never asked a question here before but these forums seem to have some extremely knowledgeable people so I thought I'd give it a try. I know it's a 1st grade question but I honestly don't have the ...
- 89
3
votes
1
answer
228
views
When we are looking for volts vs SHE, is it that the potential of the element is compared to hydrogen potential?
I'm new to understanding this aspect of electrochemistry and only just now refreshing my memory of high school chemistry for a specific purpose. If I've worded the question or anything else ...
- 51
-3
votes
2
answers
207
views
Will strong base corrode aluminium in absence of oxygen? [closed]
From what i understand, putting iron in a vacuum chamber (airtight container) will stops further oxidation take place.
However in aluminium, with only oxygen, aluminium will form thin oxide film that ...
- 15
1
vote
2
answers
170
views
Is it possible to electrochemically remove the aluminum fouling a steel file?
I have a number of metal files that, to my regret, I have used on aluminum which gets stuck to the teeth. As suggested on several mechanics forums, I have tried soaking the files in concentrated ...
- 29
1
vote
1
answer
63
views
Why did these magnetic ball bearings corrode?
Before the pandemic, I bought a set of magnetic ball bearings (a few mm in diameter) and attached them to a side panel of my desk (presumably, the panel is iron coated in grey paint).
On returning to ...
- 119
1
vote
0
answers
37
views
Galvanic corrosion in heating system [closed]
I’m a training heating engineer and have am unsure on hydrogen build-up in heating systems. I understand that any free air and the water within a heating system will react with the iron content in ...
- 11
0
votes
0
answers
57
views
Corrosive potential of molten ionic salt
I was looking at this video about fourth generation of nuclear reactors and one of developing concepts is molten salt reactor (MSR) where melted ionic salt replaces water as coolant and also acts as a ...
- 109
6
votes
1
answer
2k
views
Does 99.8% acetic acid cause severe skin burns like formic acid?
I've so far handled only concentrated fuming nitric, sulfuric & hydrochloric acids from the inorganic side. Even during an accidental spill on the hand I did say only the $\ce{HNO3}$ affects the ...
-2
votes
1
answer
222
views
Corrosion rate of aluminium
In which conditions the corrosion rate of aluminium is faster?
a) acidic conditions
b) neutral
c) alkaline conditions
I know that corrosion can be in a and c cases but I dont know when it'll be faster....
- 1
0
votes
2
answers
364
views
Combining Lead pipe with Zinc or Copper pipes in a domestic water installation
Grateful if someone assists in explaining this example that appears on a high school text book. The problem can be summarized as follows:
"Old water networks supply water to a residential area ...
- 33
1
vote
1
answer
6k
views
What is this white layer on brass?
I have an object made of what I assume to be brass, i.e. an alloy of copper and zinc.
The curved parts have both a black layer and a white layer (also note the verdigris (I guess) on the left top, but ...
2
votes
0
answers
350
views
Can acetic or citric acid be too highly concentrated when used for cleaning copper?
I intend to clean a copper surface with acetic or alternatively citric acid. There are many different concentrations recommended by different sources on the internet. For example vinegar with 10% acid ...
- 121
-1
votes
1
answer
1k
views
Why is RO water more corrosive?
According to several articles from the American Water Works Association, permeate from RO should be stabilized in terms of pH and hardness to avoid corrosion of the distribution piping.
How does ...
- 69
-2
votes
1
answer
1k
views
Copper vs Stainless Steel - which is more resistant to corrosion? [closed]
I keep reading conflicting information on this.
For normal water with a normal ph balance, over time which more resistant to corrosion - copper or stainless steel?
- 159
7
votes
3
answers
205
views
Rusting in every other bar
I have noticed that, when a structure with bars (such as a gate or a grate) develops rust, this sometimes happens differently across the bars. In particular, it seems that the bars are alternatively ...
- 181
1
vote
0
answers
138
views
Why is aluminum oxide resistant to corrosion?
It is common knowledge that aluminum is relatively resistant to corrosion due to its tough oxide layer. The ultrathin (1 nm even) layer is impervious to water and oxygen. What I can't figure out is, ...
- 387
2
votes
3
answers
2k
views
What (stored-as-solids) acids/liquids can clean corroded copper?
I'm looking for a liquid that can remove copper corrosion (oxides and basic carbonates - the black and green stuff) off copper piping.
The corrosion will be located on the inside of the pipe, in hard-...
- 121
0
votes
0
answers
31
views
6463-T6 aluminum oxidation and role of water and ethanol vapor
Our issue...in a nutshell: We use 6463-T6 aluminum as a sampling "cell" for analysis of water and ethanol vapor mixtures in both wet and dry gas variations. As I understand it, the ...
1
vote
1
answer
195
views
How does copper rich "weld thru" primer protect iron / steel?
In the automotive industry, to protect steel which cannot be painted (e.g. the gap or seam between two sheet panels), a product known as weld thru primer is sometimes used.
This is a coating of zinc-...
- 113
1
vote
3
answers
1k
views
Are all corrosives either acids or bases? [closed]
Are all corrosives either acid or a base? From what I could remember from school, strong acids and bases can be corrosive, but can substances be corrosive from reasons other than that? I tried my best ...
-2
votes
1
answer
475
views
Rusting of iron is quicker in saline water than in ordinary water [duplicate]
I feel so because, saline water has more more electrons and because of that there will be oxidation will take place faster and hence the overall process will speed up. Is this explanation good enough ...
- 151
8
votes
1
answer
1k
views
Why does the corrosion of a steel nail develop iron ions in the ends of the nail and hydroxide in the middle of the nail?
We did an experiment in school where we put a steel nail in a solution consisting of:
1 g agar;
100 ml water;
100 ml indicator solution (which gets blue whenever $\ce{Fe^2+}$ is created and red when $...
- 81
-1
votes
1
answer
582
views
Should I be concerned about a galvanic reaction between silver solder and stainless steel?
I would like to solder a drain fitting onto my ultrasonic cleaner's tank. The fitting and the tank are both stainless steel. During its operation, the tank is filled with a cleaning solution and heat ...
- 874
1
vote
2
answers
2k
views
Will aluminum continue to corrode after its surface is oxidized?
After doing some reading, it is common to read that aluminum is corroded by oxygen, but that the thin layer of aluminum oxide protects the internal metal from further damage. How much does this layer ...
- 121
1
vote
1
answer
141
views
Clarifying question about chloride ions, water softening & corrosion
I have a question regarding the use of NaCl as a water softener.
Recently i was asked to comment on a series of test results from a water softening device were a lot of corrosion had occurred post ...
- 311
3
votes
1
answer
368
views
What materials are resistant to hot chlorine?
I'm looking to do an experiment involving hot chlorine gas (900 Celsius), however at the moment the only material I'm aware of that could cope with this is Hastelloy's C-22 alloy. What other ...
- 207
30
votes
4
answers
9k
views
Is "stainless" a bulk or a surface property of stainless steel?
In particular, if I cut a block of stainless steel in half, would the newly formed faces be stainless as well?
- 4,265
9
votes
1
answer
850
views
What happens to the carbon in carbon steel when it rusts?
Carbon steel is iron containing some carbon in various forms of iron carbide.
When it rusts (oxidises), the iron becomes part of all kinds of crystalline and amorphous iron oxides and hydroxides, ...
- 5,442
1
vote
0
answers
65
views
"Hairy" corrosion on anodized alu-part in water
I got a water tank with a mechanical assembly in.
The assembly consist of parts of anodized aluminium mounted on stainless steel plates (AISI 304). This is submerged down in fresh water. The tank is ...
- 11