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Questions tagged [corrosion]

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What are effective anti-corrosion coatings for high carbon steel springs?

In trampoline design, the most common springs have a total elongation of about 60% of rest lengh. E.g. a 10" spring can be stretched to 16" indefinitely without deformation. These springs ...
Sherwood Botsford's user avatar
2 votes
0 answers
21 views

dielectric unions and bonding continuity

I am a layperson not an engineer. In the diagram below showing an old house with a mix of copper and galvanized steel water pipes connected by a dielectric union, with the two dissimilar sections of ...
Tim's user avatar
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1 answer
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Does galvanization protects mild steel from corrosion even it crack or scratch?

I need to protect mild steel (steel with low carbon) from corrosion even any crack or scratch on it. I searched on internet, I found recommendation like this: Keep it clean, Apply protective coatings ...
AirCraft Lover's user avatar
1 vote
1 answer
158 views

Risk of corrosion putting aluminium shaft in a stainless steel bearing with frequent washdowns?

Should I worry about galvanic corrosion if using an aluminium shaft inside a stainless steel bearing in something that's going to be washed down frequently? Considering I will press the shaft into the ...
Oliver Walters's user avatar
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0 answers
53 views

Can different stainless steel grades corrode each other in contact

I am planning an application in which two stainless-steel grades can come into contact with each other. Can the differences in the grades cause corrosion in hot oily environment where water cannot be ...
Imsa's user avatar
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2 answers
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Lead Cladding on Telephony (landline) copper cables. Any other early industrializers with this problem?

A recent environmental hazard has just been uncovered this past week by the Wall Street Journal: "America Is Wrapped in Miles of Toxic Lead Cables" https://www.wsj.com/articles/lead-cables-...
Kiers's user avatar
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1 answer
31 views

Orange spots at hot dip galvanized surface

I like to ask you about orange spots after galvanizing of Steel Purlins. I attached some of the pictures. Please advice the solution with your expertise. Thank youenter image description here enter ...
Imran Mushtaq's user avatar
1 vote
1 answer
228 views

What aluminum grade is the most resistant to corrosion in alkaline environment?

Quick google search will return either 6000 series (6061 more specifically), or 3003 However with so many option and each having it's own benefit, I still haven't make my decision What I am looking ...
poalsd's user avatar
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1 vote
2 answers
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Influence of design on corrosion control

In "Ahmad. (2006). Principles of corrosion engineering and corrosion control (1st ed.). Elsevier/BH.", it is stated that to fight against metallic corrosion it is more convenient to design (...
Carlos's user avatar
  • 111
2 votes
1 answer
227 views

Aluminium Bolt in Titanium Casing: Any Dangers of (Contact-)Corrosion?

Assumed we have a fuel flask that is made of titanium. The bottle will be filled with white gasoline when used. At the bottleneck there is a standardized thread manufactured into the titanium. Are ...
Dave's user avatar
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2 answers
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Steel grade recommendation

I'm working on a private project (no commercial motivations here) to build an outdoor (wood fired) pizza oven for my garden. It's basically made of steel, so my question is which steel grade would be ...
Juan Cortines's user avatar
2 votes
1 answer
817 views

Why is reverse osmosis permate corrosive?

I encountered a corrosion problem with a reverse osmosis (RO) unit years ago. A cooling water system in a remote gas compression plant used RO-processed river water to supply makeup water. The cooling ...
baltakatei's user avatar
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1 answer
190 views

Sacrificial Anode Marine Growth / Biofouling

https://www.youtube.com/watch?v=1ed5jkbLEOs A link to a video of an inspection for a group of zinc sacrificial anodes is above. The video is very long but all of the anodes have the same buildup on ...
Adrian Beltran's user avatar
1 vote
2 answers
125 views

How do you clean/restore corroded battery terminals?

I'm sure everybody has come across a case like the following: My experience is that this corrosion must act as an insulator(/or shortcircuit). I have managed -in some cases- to clean by scrubbing and ...
NMech's user avatar
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1 vote
1 answer
596 views

Salt grinder and corrosion

I am looking for a kitchen salt grinder. I know salt is an aggressive compound and it needs a little bit of attention when we design products. Since most of grinders have plastic-made or stainless ...
mattia.b89's user avatar
4 votes
2 answers
573 views

Why does corrosion take place at certain stressed regions?

Why does certain parts of metal show more corrosion at the place where there is high dislocation density in comparison to the place where the dislocation density is less? I do sincerely feel that this ...
user586228's user avatar
0 votes
4 answers
2k views

Can I safely cook on High temperature paint?

Like a million others, I have a set of enameled cookware that has seen enough use that the enamel has boiled, burned, or chipped off down to the cast iron substrate. Surprisingly, the outer painted ...
Mike Havnaer's user avatar
2 votes
1 answer
190 views

Galvanic compatibility with mild steel

Let me just get this out of the way: this is a total newbie question. But I appreciate any advice I can get! I'm rebuilding / retrofitting a wood-and-steel trailer, and trying to identify affordable ...
Eric Anderson's user avatar
1 vote
3 answers
231 views

Would a sacraficial anode be used to protect large boat (aircraft carrier) or is there something different?

I did the calculation for the surface area to anode ratio (zinc) for a project recently. It was my first time going through this exercise, and I ended up with a 7.2% number for surface area ratio (...
b degnan's user avatar
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0 answers
38 views

Galvanic corrosion in a non-corroding environment

If we submerge a welded structure of, for example, Duplex (1.4462) and Stainless Steel (1.4301) in water, which is normally not a threat for either of these materials alone, do we see corrosion in the ...
Pekka's user avatar
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2 votes
1 answer
97 views

carbon steel corrosion in chloride solution

we have a alkaline solution with Cl content of 3500 ppm, and pH=10 ,my question is if the carbon steel material is proper for this solution or not?
hamid's user avatar
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0 votes
1 answer
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Plate thickness for repair of completely corroded web

The web of a H-section column has been completely corroded at the air-moisture interface with the concrete encasement leaving a hole in the web. The proposal is to break out the existing concrete and ...
egg's user avatar
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2 votes
3 answers
89 views

corrosion in electrical parts and wiring

I work in a pharmaceutical plant where saline solution is produced and bottled. The environment has to be clean (by pharma standards), which rules out many greases and other protective coatings. As ...
PavoDive's user avatar
  • 175
3 votes
2 answers
97 views

Does the pressure due to corrosion in concrete depends on degree of corrosion?

I am trying to relate the degree of corrosion with the pressure exerted in surrounding concrete. My common sense tells me that higher the degree of corrosion, higher should be the pressure exerted, ...
Nirmal Raj Joshi's user avatar
0 votes
1 answer
2k views

What is the most corrosion resistant 55HRC stainless steel?

55 HRC is a very high hardness, even for steels. Ideally the corrosion resistance of the steel would have to match AISI 316L or be even better. Qenched stainless steel can go to 55HRC. Even to 65 ...
user6131's user avatar
2 votes
3 answers
92 views

What type of stainless steels can resist 6 months under the sea?

Resist means without catastrophic corrosion here. We assume that there is no coating or anodic protection. The steel can be mirror polished and passivated. To make it more difficult, the shape is not ...
Xiiryo's user avatar
  • 161
0 votes
4 answers
147 views

Selection of corrosion resistant material for mechanical testing apparatus

I want to build a 4-point bending apparatus for operating within a corrosive environment, using EXCO type corrosion solution as seen in ASTM Standard G46. Thus, in this highly corrosive environment, I ...
User2341's user avatar
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0 votes
1 answer
27 views

is there any other ways to refine mesh size in particular place without making a partition?

I am currently making a corroded model in Abaqus, but not all locations are suffering from corrosion. As shown in the picture there are some parts (the blue parts) that do suffer from corrosion, so ...
Cindy.Karina9's user avatar
3 votes
1 answer
388 views

What material should I use to store molten metal?

I'm performing an experiment based on slag corrosion behavior of the refractory material. I need to store molten metal at $\approx$ 1600-1700 K for that. Specifically, I'm working on slag corrosion ...
dilkesh kumar's user avatar
-1 votes
1 answer
744 views

Are brass and copper utensils safe for humans to eat from? [closed]

In my research over the internet everyone is telling that brass is not safe but still there are solenoid valves, joints, and piping made of brass used in everything like coffee machines, water ...
ZBT248's user avatar
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4 votes
2 answers
9k views

Chloride corrosion of carbon steel pipe

I am specifying pipes for a water system with 500 ppm chloride in solution. Ordinarily we would specify 316L stainless steel to limit the corrosion, but I was asked if we could instead specify carbon ...
Secundus's user avatar
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1 vote
1 answer
112 views

How thick of an oxide might form on a cast zinc part?

I'm looking into possible failures of a cast zinc part. I'm wondering if the Zinc-oxide that develops after a time would have a thickness great enough to cause dimensional tolerancing issues? ...
Diesel's user avatar
  • 622
3 votes
1 answer
661 views

Will ammonia vapor corrode 304SS?

Will 25% ammonia vapor balance water vapor between 350°C - 550°C corrode 304 SS? If you know the answer how did you find it what was your source or equation or book? Will it cause pitting or stress ...
Pford's user avatar
  • 31
5 votes
1 answer
2k views

How does Alloy 20 compare with Ti 6-4, C-276 and 316 stainless for corrosive service?

While I've designed tons of plastics for corrosive service, the fasteners to hold the plastics together are inevitably metallic. There have been a lot of ways to protect them from rusting (due to ...
Mark's user avatar
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4 votes
3 answers
2k views

What metal material to use for stove exhaust pipe?

If biofuel is burnt, for example wood, and the stove I am building is made of metal, what is the most appropriate metal material I should use to avoid excessive corrosion in the exhaust pipe of the ...
Mohdak's user avatar
  • 417
10 votes
1 answer
646 views

Does weathering steel corrode the same as carbon steel when it doesn't develop a protective patina?

Weathering steel is supposed to form a protective patina when exposed to wetting and drying cycles. This protective patina prevents more corrosion from occurring. This is what differentiates it from ...
hazzey's user avatar
  • 10.7k
4 votes
3 answers
134 views

Electrochemical protection for corrosion

When we have a part that tends to corrode; Is it possible to apply an electrode on it to sense the excess or deficit of electrons on it that make it prone to corrosion and accordingly send a current ...
sloupioc's user avatar
  • 313
4 votes
0 answers
33 views

Pretreatment for galvanizing primer

I currently need to paint a steel structure with galvanizing primer. The primer is an epoxy with >90% Zinc content. The TDS for the primer states that intimate contact with the substrate is needed ...
Acumen Simulator's user avatar
4 votes
0 answers
20 views

321 stainless electrode corrosion factors? (arc erosion resistantance)

I am looking to lengthen the life of 321 stainless Steel electrodes (arcing through quartz glass). If I seal off the electrodes from oxygen (thermally conductive potting compound) will this ...
super thanks's user avatar
4 votes
2 answers
392 views

How do protective coatings affect the lifetime of bridges?

I'm trying to understand the importance of protective coatings on steel structures like the Golden Gate Bridge. For example, if we stopped maintenance on the Golden Gate Bridge today and left it ...
bobuhito's user avatar
  • 211
1 vote
0 answers
44 views

Corrosion of a galvanic couple made with silver and gold

If a bangle is made out of gold and silver, connected with each-other would there be a corrosion happening? If so can it be explained using the galvanic series? Also do those metals undergo oxidation ...
ManZzup's user avatar
  • 111
6 votes
1 answer
3k views

How does corrosion occur at a temperature below 0 degrees Celsius?

The ISO 9223 standard indicates that there should be no corrosion at temperatures below 0 degrees celsius. Independent researchers have however proposed to lower the minimun temperature stated in the ...
user avatar
11 votes
1 answer
2k views

Will a sacrificial anode protect any length of metal that it is connected to?

When using a sacrificial zinc anode, is there a limit to the distance that its protection will extend? The protection works based on electrical conductivity, so distance would seem to affect the ...
hazzey's user avatar
  • 10.7k
13 votes
1 answer
1k views

Can Zinc/Aluminum coated anchor rods be used in concrete?

Bolts and anchor rods that are very high strength ($F_u$ > 150ksi) are not supposed to be galvanized. This is because of concerns about hydrogen embrittlement. This includes ASTM A 490 bolts and ASTM ...
hazzey's user avatar
  • 10.7k
13 votes
3 answers
2k views

Do I need to worry about galvanic corrosion when inserting a steel bar through aluminium?

My design uses a round steel bar inserted through a hole in an aluminium component with a tight fit (no movement). The operating environment is dry, 20-40°C. Do I need to worry about galvanic ...
jhabbott's user avatar
  • 5,970
11 votes
3 answers
3k views

What kind of protection should I give structural steel in a natatorium (swiming pool) environment?

What would be the best type of steel to specify? Would a heavy galvanization suffice? Are there specialty paints/coatings available for this particular application? If so, how long do they last?
cKrug's user avatar
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