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Questions tagged [galvanic-corrosion]

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Outdoor-rated fastener for concrete epoxy anchor

In order to mount some brackets to hold unistruts channels I need to insert some fasteners into a concrete slab I poured a couple of years ago (outdoors, exposed to rain etc). I would like to drill ...
Alessio Sangalli's user avatar
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1 answer
57 views

do dielectric unions preserve continuity or do the two pipes need to be jumpered to preserve continuity?

Scenario: old house (not mine) with a mix of galvanized steel pipe and copper pipe. Pinhole leak in galvanic pipe, and it was replaced by plumber with a brass nipple and a dielectric union where it ...
mr blint's user avatar
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How can I hook up an old cast iron hot water heater to my hydronic heating system

The existing hydronic system is run in copper with finned tubing in baseboard heating mostly. We split off a chunk of bedroom to make a small ensuite. It currently has a a 1KW electric heater. I ...
Sherwood Botsford's user avatar
5 votes
3 answers
2k views

Main Water Line coming into House leaking/rusted out - How to replace and with what?

We just purchased a home in Joshua Tree, CA and the main water line coming into the house after the exterior shut off valve is leaking a lot. The concrete over part of it came off and I am able to see ...
JTree44's user avatar
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1 answer
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How to prevent GI pipe from getting corroded

I have a hollow GI pipe. I recently got the top end welded but top end is corroding along with that I think GI pipe is also corroding. I'm think I should unweld the cap and paint the inside of GI by ...
King's user avatar
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Dielectric question

I'm replumbing a home, and I have a quick question of when/where to use a dielectric fitting. The water main is coming through a bedroom, outside the interior wall. Starts galvanized from floor and ...
Pstruder's user avatar
1 vote
2 answers
507 views

How should I attach sacrificial anodes to steel columns in concrete?

Soldier pile retaining wall. We're putting 25 foot long w8x48 beams into 16 foot deep holes and filling with concrete. So the steel beam is encased in concrete. I would like to increase their ...
user227963's user avatar
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2 votes
1 answer
330 views

Will stainless bolts rust more or less than zinc plated when installed in cast iron?

Scenario: I have a 3-seasons ocean side cottage which sources its water from a shallow well via a convertible jet pump with a cast-iron casing/housing. I winterize the water system each fall and the ...
GWR's user avatar
  • 609
1 vote
2 answers
497 views

Are galvanized or stainless machine screws OK to use with field-tapped holes in aluminum castings (outdoors, wet)?

I'm installing some weatherproof cast aluminum junction boxes outdoors (full rain/sun exposure) for a GEC run, and would like to drill/tap additional holes in them to mount brackets etc. Do I need to ...
Armand's user avatar
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2 answers
877 views

How can I deal with galvanic corrosion on my water heater?

My water heater is 4 1/2 years old. Looks live galvanic corrosion. Can I get by without replacing the whole heater? Maybe just the pipes and fittings?
LLC's user avatar
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3 votes
3 answers
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Will Stainless Steel Screws with Galvanized Hinges Cause Corrosion? (Exterior Application, Near Ocean)

I have a set of galvanized hinges for a shed door. The shed is located 50 feet from the ocean. Very salty air. The hinges didn't come with screws and I'm having a hard time finding suitable galvanized ...
GWR's user avatar
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3 votes
1 answer
1k views

Reverse Osmosis (RO) water leeching galvanized pipe

Recently I installed a whole house reverse osmosis (RO) system. It was working great for a couple of weeks, unfortunately I didn't do all my research about RO and its affects on metal pipes. Recently ...
dmoody256's user avatar
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1 vote
2 answers
3k views

Joining galvanized gutter sections: Rivet, solder, spotweld, or another method?

I will be replacing a section of gutter on a barn in a month and was wondering what the best method of joining the sections is. I will have limited ergonomics working in a lift about 27 ft off the ...
Peggy Schafer's user avatar
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2 answers
525 views

Dealing with build up from galvanic corrosion in supply tees

I opened up the wall behind my kitchen sink during a major remodel to find iron nipples in threaded brass fittings. Here is an image with labels: I removed the iron nipples from both cold water ...
Air's user avatar
  • 201
1 vote
1 answer
261 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 ...
Jonx1000's user avatar
2 votes
2 answers
285 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 ...
LShaver's user avatar
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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 ...
zwiebelspaetzle's user avatar
10 votes
5 answers
17k 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 ...
zwiebelspaetzle's user avatar
0 votes
1 answer
795 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 ...
Gary Ruse's user avatar
1 vote
2 answers
858 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 ...
zwiebelspaetzle's user avatar
3 votes
2 answers
2k 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 ...
brentonstrine's user avatar
1 vote
1 answer
495 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 ...
Brybeck's user avatar
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1 vote
2 answers
211 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 ...
MonkeyZeus's user avatar
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2 answers
257 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 ...
Mike Nitchie's user avatar
0 votes
0 answers
137 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 ...
Tyler Durden's user avatar
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0 votes
4 answers
3k 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 ...
rbhat's user avatar
  • 2,083
-1 votes
4 answers
858 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 ...
rbhat's user avatar
  • 2,083
1 vote
0 answers
76 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 ...
RustyShackleford's user avatar
1 vote
4 answers
9k 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 ...
0tyranny0poverty's user avatar
3 votes
1 answer
4k 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 ...
aggieNick02's user avatar
0 votes
1 answer
853 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 ...
rbhat's user avatar
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1 vote
1 answer
5k 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 ...
iLikeDirt's user avatar
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