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Questions tagged [corrosion]

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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 ...
3
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3answers
69 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 ...
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0answers
20 views

Chemical or corrosion related concerns safety concerns with mating brass threaded & quick disconnect couplings to aluminum/stainless steel fittings

A part from the mechanical mating concerns - I need to know if there are any chemical or corrosion related concerns with connecting threaded & quick disconnect brass fittings with stainless steel ...
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0answers
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How can I make a copper-iron alloy by heat treatment of a sample of steel coated with copper?

I am working on corrosion test of a steel sample coated with pure copper by using a thermal projection with an arc spraying in my graduation project. I came a cross a problem with the adhesion and the ...
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3answers
93 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 ...
0
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1answer
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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 ...
2
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1answer
191 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 ...
-1
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1answer
91 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 ...
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0answers
40 views

What is the best Grade of Stainless steel for a high pressure vessel

I am going to have a spherical pressure vessel made. I need to know which grade of stainless steel suits best. The pressure vessel will contain liquefied diluoromethane at 1.8Mpa with ...
4
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2answers
2k 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 ...
1
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1answer
98 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? ...
3
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1answer
189 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 ...
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1answer
394 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 ...
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3answers
729 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 ...
10
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1answer
277 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 ...
4
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3answers
97 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 ...
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0answers
25 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 ...
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0answers
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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 ...
4
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2answers
285 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 ...
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0answers
33 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 ...
6
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1answer
799 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 ...
10
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1answer
643 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 ...
13
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1answer
565 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 ...
12
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3answers
617 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 ...
10
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3answers
869 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?