Questions tagged [galvanic-corrosion]

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52 views

How to remove this galvenized pipe?

I'm attempting to replace the pipes between the bathroom sink ptrap till the end of the pipe that leads to the basement as you can see depicted in the photo. I was able to remove the ptrap as well as ...
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2answers
69 views

Will this plumbing setup result in galvanic corrosion?

When I moved in two years ago, the plumbing in this area showed significant corrosion. There was no galvanic isolation between the steel pipes leading to the upstairs bath, and the copper piping in ...
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2answers
101 views

Is a mix of copper and galvanized pipe a problem if dielectric unions are used where they meet?

Over decades, my house has accrued a mix of galvanized, copper, and pex pipe. I've been told that one "should stick to one type of metal in your pipes or use pex." (here) As long as ...
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5answers
3k views

What is causing these water heater pipes to rust/corrode?

This water heater was replaced by a plumber 4-5 years ago. Within about a year, all the new connections were rusting/corroding. Did the plumber not sufficiently tighten the fittings? Is this perhaps ...
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1answer
172 views

What's this white crust in my kitchen pipe threads?

I had to change the kitchen sink P-trap (J pipe and tailpiece) and there's hard white crusty stuff in the threads that's making it difficult to screw on the new ring nut connectors. The old parts had ...
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2answers
96 views

Under what circumstances is galvanic corrosion a concern in electrical work?

I'm curious why contact between dissimilar metals in electrical work is seems to only be a problem in some cases. For example, one must use antioxidant when joining aluminum and copper wiring in ...
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1answer
370 views

Is there a test to determine if a nail is galvanized or not?

I bought a nailer which came with some old nails that I'm going to use for a shed floor into pressure treated wood. As you can see, they kinda look galvanized. They have that grey patina. But other ...
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1answer
175 views

Galvanized steel hinge screws with stainless steel hinges: What is the risk of galvanic corrosion?

The screws in question are zinc-plated hardened steel screws (1 1/4 in) for use with heavy duty fire-rated stainless steel interior door hinges of unspecified grade. There is a theoretical risk of ...
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2answers
137 views

Should this section of water line be replaced?

This is the water supply line coming into my basement. 4 feet below the ground (frost line). My house is from 1940 and I assume that everything in these pictures are original. I recently converted ...
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2answers
114 views

Hillman “Deck Plus” lag screws

I'm re-planking my deck and shoring up some of the substructure while I'm in there. The beams are side-mounted to the posts like this (from dca 6): This is obviously non-ideal, but is impractical to ...
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0answers
53 views

Cast Iron drainpipe - which bolt should i buy to replace sheared one?

Rusty pipe alert: I sheared off one of two bolts taking an inspection plate off a 40 year old cast iron drainpipe. It is M8 an about 15mm long. I'm supposed to get something that's with 0.15 on a ...
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0answers
73 views

How can I diagnose galvanic corrosion on a water pipe?

I have a newly installed indirect hot water heater and two of the pipes are showing significant amounts of corrosion. Given that the installation is only 3 months old, I suspect that there may be ...
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4answers
765 views

How can I treat and prevent rust in steel wire rope?

After 8 years of questions, I finally completed the fence. The issue I’m having now is that the loops in the steel are rusting at a pretty fast rate. I’m looking to spray them with something that will ...
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4answers
354 views

galvanized or stainless turnbuckles for exterior wire rope fence?

I'm working on a wire rope fence that looks like this. The difference is that we live fairly close to the ocean, which means lots of salty air. I've bought 1/8" galvanized steel with plastic coating ...
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0answers
37 views

galvanic corrosion with anchor point on galvalume roofing

I'm going to add some sort of anchor point, for attaching a safety rope, to my galvalume roof (some sort of shoulder eye bolt, but that is a different discussion). My question, what metal is best ...
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4answers
4k views

Can I convert galvanized ducts to wood stove black ducts by coating it with high temp RustOleum paint?

I compared the black ducting for wood stoves with regular galvanized ducting and found that they are both 24 gauge and I noticed they are both steel since both tug magnets. There is quite a large ...
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1answer
3k views

Water heater inlet corrosion after 4 years? Installer claims they did everything right

Similar to this question, I've got severe corrosion on my 4 year old water heater inlet. I was having the heater flushed when this was discovered, and the person flushing it said it was caused by the ...
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1answer
382 views

Any way to see if it's made of galvanized steel?

Is there any easy way for me to see if something is made from regular steel or galvanized steel? I'm having some galvanized steel bases installed at my apartment, but I want to make sure it's actual ...
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1answer
2k views

Is galvanized steel totally incompatible with cedar, even when only touching on the surface?

I'm building a cedar picket fence attached to 2 3/8" chain link fence style galvanized steel posts using galvanized post brackets like these. I know that there are a lot of material incompatibility ...