11
votes
Why does corrosion take place at certain stressed regions?
One of the mechanism that affect corrosion is known in the literature as Stress Corrosion Cracking (SCC). The idea is that tensile stressed regions are prone to crack development. Crack development ...
- 24.3k
9
votes
Accepted
What metal material to use for stove exhaust pipe?
It depends on flue gas temperature.
High temperature $(>250\ \textrm{C})$: use galvanized steel.
Low temperature $(<250\ \textrm{C})$, use stainless steel or PVC as appropriate.
See below for ...
- 4,041
7
votes
Accepted
Does weathering steel corrode the same as carbon steel when it doesn't develop a protective patina?
In a situation where the environment does not allow the patina to form, does weathering steel perform any differently than carbon steel?
Weathering steel is specifically designed to form a protective ...
- 3,587
7
votes
Accepted
How do protective coatings affect the lifetime of bridges?
If you are really considering catastrophic failure, what you are asking actually has several parts. The first is the coatings aspect, the second is the metal structure, the third is the connections, ...
- 652
5
votes
Would a sacraficial anode be used to protect large boat (aircraft carrier) or is there something different?
" Something different". Impressed current, very likely using titanium anodes , and the hulls have coatings/paint to reduce necessary current flow. Navy vessels can be relatively fast , so ...
- 6,112
5
votes
Influence of design on corrosion control
A is worse because the item holds water. Holding water resuults in corrosion, certainly near the surface. C sheds water so it will normally be dry.
Accumulation of impurities seems a needlessly ...
- 6,544
4
votes
What type of stainless steels can resist 6 months under the sea?
For this type of use and to make it simple we will calculate the Pitting resistance equivalent number. This is based upon the material composition.
PREN = 1 x %Cr + 3.3 ( %Mo + 0.5 x %W ) + 16 x %N
...
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4
votes
Accepted
Why does corrosion take place at certain stressed regions?
In the real world ,I don't believe I have seen CORROSION at STRESSED areas. Corrosion may be accelerated at STRAINED areas; the strains introduce energy to the microstructure which may promote ...
- 6,112
4
votes
Sacrificial Anode Marine Growth / Biofouling
The anodes may develop fouling but they still work. Most often they are aluminum , possibly alloyed ( eg. Galvalum ).
The protected steel builds up a "calcareous" protective surface layer ...
- 6,112
4
votes
Accepted
Aluminium Bolt in Titanium Casing: Any Dangers of (Contact-)Corrosion?
Galvanic Compatibility
Often when design requires that dissimilar metals come in contact, the galvanic compatibility is managed by finishes and plating. The finishing and plating selected facilitate ...
- 8,134
3
votes
Can I safely cook on High temperature paint?
I wouldn't try for my kitchenware. I would strongly advice against it.
The main problem is that you'd be in danger of digesting high temperature paint. Even though some of them might be inert, we'd ...
- 24.3k
3
votes
What metal material to use for stove exhaust pipe?
Just to add some unique engineering solutions that are used, depending upon applications:
Brick works wonders - it resists the acid in the smoke well and can withstand the heat. Not metal, but well ...
- 5,343
3
votes
Accepted
Chloride corrosion of carbon steel pipe
Corrosion can usually, but not always, be modeled as a 0-th order reaction which means linear with time. ASME B31 piping code treads lightly into this, mainly discussing factors to be used when ...
- 5,343
3
votes
What aluminum grade is the most resistant to corrosion in alkaline environment?
None, 3003 is listed as better general corrosion resistance but it makes little difference which aluminum alloy is used in a seriously corrosive.
- 6,112
2
votes
What metal material to use for stove exhaust pipe?
what is the most appropriate metal material i should use to avoid excessive corrosion in the exhaust pipe of the stove?
If you're looking for corrosion protection, stainless steel is hard to beat. ...
- 3,587
2
votes
Will ammonia vapor corrode 304SS?
Following Paper gives Corrosion rate for 304 SS in Ammonia + Water Vapor environment:-
Louis Caruso, Harold Mitchels,"Resistance of copper-nickel alloys to ammonia corrosion in simulated steam ...
- 105
2
votes
Are brass and copper utensils safe for humans to eat from?
It always depends on the concentration and where you place the copper within the human body.
In my opinion, the most interesting example are implants which are coated with copper and implanted ...
- 139
2
votes
Does the pressure due to corrosion in concrete depends on degree of corrosion?
I'd say the mistake is assuming infinite stiffness for concrete and steel so only the rust has a strain. In reality, rust is probably the stiffest material involved, and you will get a better ...
- 1,288
2
votes
Accepted
corrosion in electrical parts and wiring
I guess you are using iron/Constantan thermocouples for the relatively low temperatures; so iron is going to corrode badly . Can you change to chromel / alumel couples ? It would require some ...
- 6,112
2
votes
Accepted
Galvanic compatibility with mild steel
The major cause of corrosion for a wood/steel trailer will be moisture in the wood keeping the steel damp; any salt will increase the affect. The most practical action would be put in galvanized . ...
- 6,112
2
votes
Would a sacraficial anode be used to protect large boat (aircraft carrier) or is there something different?
When ships are in static storage for extended periods of time, impressed current is used to protect them from corrosion. The counter electrode is a carbon rod the size of a telephone pole and the ...
- 14.4k
2
votes
Would a sacraficial anode be used to protect large boat (aircraft carrier) or is there something different?
Two forms of Cathodic Protection: Sacrificial anodes; and ICCP (Impressed Current Cathodic Protection).
Sacrificial anodes are passive and the anodes get eaten away as they protect the vessel. ...
- 2,467
2
votes
carbon steel corrosion in chloride solution
It depends on how long you want it to last to decide if it is "proper". Generally the solution sounds like seawater ( although seawater pH is around 8 +).Corrosion will be strongly affected by factors ...
- 6,112
2
votes
What type of stainless steels can resist 6 months under the sea?
I would say Thibd's answer excellent. However, one should look at the cost (including fabrication) on Monel, Incoloy 825, any Inconel or Hastelloy or Titanium . Although not "steel" they are metals ...
- 6,112
2
votes
Can I safely cook on High temperature paint?
The coatings on cookware are not paint. They are fused ceramics.
- 6,112
2
votes
Influence of design on corrosion control
Any geometry that can trap water can accelerate corrosion drastically. moisture will act as an electrolyte in reaction cells between the air's oxygen and surface electrons of the metal, leading to ...
- 22.1k
2
votes
Orange spots at hot dip galvanized surface
Those aren't orange spots, they're rust. You didn't get a good zinc application, either from how it was resting in the container or from insufficient surface prep.
Note that galvanized steel will ...
- 6,544
2
votes
Accepted
Risk of corrosion putting aluminium shaft in a stainless steel bearing with frequent washdowns?
My bigger concern would be the bearing surviving the frequent washdown lol.
A bead of silicone like you mentioned will help with galvanic corrosion, but as others have mentioned will not fully ...
- 7,914
1
vote
Accepted
How do you clean/restore corroded battery terminals?
I have restored several outdoor devices, including a garage door opener this way:
Start with hot water, and something gentle, like a toothbrush. The hot water can help solubility compared to alcohol ...
- 1,387
1
vote
Salt grinder and corrosion
My experience is that salt is not necessarily corrosive if kept dry. Moisture will interact with the salt if there is sufficient humidity.
For your grinder objective, consider a coffee grinder using a ...
- 6,975
Only top scored, non community-wiki answers of a minimum length are eligible