Questions tagged [galvanic-corrosion]

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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 ...
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0 votes
3 answers
106 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?
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3 votes
3 answers
285 views

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 ...
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3 votes
1 answer
349 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 ...
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1 vote
2 answers
461 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 ...
0 votes
2 answers
137 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 ...
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1 vote
1 answer
102 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 ...
2 votes
2 answers
108 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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0 votes
2 answers
368 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 ...
10 votes
5 answers
6k 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 ...
0 votes
1 answer
440 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 ...
0 votes
2 answers
334 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 ...
0 votes
1 answer
975 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 ...
0 votes
1 answer
308 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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1 vote
2 answers
177 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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0 votes
2 answers
180 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 ...
0 votes
0 answers
78 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 ...
0 votes
0 answers
102 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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0 votes
4 answers
2k 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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-1 votes
4 answers
555 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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1 vote
0 answers
46 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 ...
1 vote
4 answers
6k 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 ...
3 votes
1 answer
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 ...
0 votes
1 answer
604 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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1 vote
1 answer
3k 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 ...
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