Questions tagged [corrosion]

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Iron bar set in concrete heavily corroded; how to mitigate?

I have a decorative concrete column (solid concrete with rebar) in front of a multi-storey house, about 10m hight. Said column is held by three thick steel bars (6 x 2 cm) that link it to the house, ...
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1answer
46 views

Can you identify the spigot attached to this water heater?

I have a corrosion problem on my new indirect fired water heater. HTP technical support, the company that makes the heater, wants to know the alloy of the spigots attached to the hot water inlet and ...
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0answers
37 views

Is an alcohol-based spray cleaner ok for cleaning an aluminum AC evaporator coil?

Simple alcohols such as ethanol can, apparently, corrode aluminum. However, this corrosion reaction seems to be very slow at room temperature and below. Is an ethanol based, non-foaming spray cleaner, ...
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2answers
281 views

Regarding greases for outdoor connections: Noalox for general use (not necessarily for aluminum)? Dielectric grease for outdoor receptacles?

I've googled this already and found many people saying that Noalox is only for copper to aluminum connections. I know that Noalox stands for "no aluminium oxidation" but brand names often change ...
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1answer
114 views

How to remove corroded faucet?

I am trying to replace my kitchen faucet but the nut holding it onto the sink is corroded and the nut won't budge! I have tried a basin wrench (as someone suggested here), wd40, hammering at those ...
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4answers
73 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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2answers
103 views

Will steel continue rusting if it's completely covered in concrete?

Let's say I have a 5" piece of rebar in a rooftop that's exposed to the elements (ie.sun, rain, salt air, etc). After some time it will be covered in rust and pieces of rust can be scraped off. Let's ...
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0answers
78 views

Can I cover rebar sticking vertically out of the ground with something that would permit me to pour concrete over top of it?

First off, this project is free from review from inspectors; i.e. none of this has to be to code. I want to pour a concrete column. The column isn't structural - it's like a column you may find at ...
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2answers
65 views

Should I remove this gray layer on freshly bought steel?

So I bought this steel bar 240x5x0.5 cm and it has this kind of ugly, somewhat chippy surface: a dark gray layer. What is it? Should it be removed? In the picture, you can see how I'd sand it down, ...
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1answer
565 views

Painting over paint with rust spots coming through

I recently sanded down two beams to remove the rust and then painted over them with a "rust inhibitor" and then two coats of a basic ceiling paint. However there are now numerous rust spots coming ...
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2answers
1k views

How to stop copper pipe corrosion (green copper stain in sinks and tubs)

I have couple of questions to the experts. I see copper stains (green/blue) in my sinks and at shower tubs. I had comprehensive water analysis done. Water was sampled from tap after flushing. My water ...
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3answers
61 views

How should I remove corrosion like this from radiator connections

In the process of replacing a radiator and there is a fair amount of corrosion around the connections. I plan on scrubbing as much off as I can with sandpaper or steel wool, but is there a ...
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0answers
33 views

Battery terminal in wireless light switch corroded

I have a wireless light switch in my garage which uses 4 triple-A batteries. When the switch quit working recently, I took off the cover to replace the batteries and saw that the terminals were all ...
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2answers
68 views

Deteriorations in rear of gas dryer

I opened up the rear of my Kenmore 80 Series gas dryer and discovered the following aspects of deterioration: Corrosion near the bottom of the heater box. See photos 1 and 2. Crumbling of the foam ...
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2answers
925 views

What happened to my garbage disposal?

I have an In-sink-erator model garbage disposal with a black plastic housing. After fixing a jam (a shot glass that fell into it while running, quite destroying itself), I noticed that there was water ...
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2answers
254 views

What Solutions are Available for Marble Floor Etching / Corrosion

Below is a picture of what some of the tiles that have corroded over the past 25 years of use, look like in the our house. I read this QA post, however, am not comfortable with the solutions provided,...
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1answer
1k 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
47 views

Gripping a 45mm / 1.75" metal disc to allow replacement of corroded toilet lid fixtures

We wish to replace the corroded fixtures in our bathroom. It is a corner fit toilet with very little room for manoeuvring tools on the underside. I need to be able to hold the plastic washer in place ...
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0answers
1k views

What is this blue build-up on my pipes, and is it an issue?

I've looked around the intertubez, and think this MIGHT be galvanic corrosion, but there was NO sign of it when we bought our 1930's house 5 years ago. The Taco pump WAS replaced 3 years ago (that's ...
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0answers
61 views

Copper corrosion, well water

My well water pH is 7.06 as measured by an accurate and calibrated tool used for wine making. I have around 15 gpg of hardness. My question is why I am getting between .5 - 1.0 mg/L of copper in my ...
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2answers
1k views

Remove Fastener Nut for Kitchen Faucet (Rusted?)

Trying to remove my Kitchen Faucet. It's around 10 years old. The last set is to remove the Nut that holds a brass plate to fasten the faucet to the kitchen counter. The problem is, i think the nut ...
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3answers
8k views

What is this black stuff that appeared on my drain after cleaning with a bleach-based cleaner and how do I clean it?

Recently, I had problems with a pinkish/orange-colored bacteria (Serratia marcescens) in my bathroom. The bacteria would show up in my shower and sink, specifically near or around the drains. To ...
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2answers
2k views

emery cloth or sandpaper to remove corrosion

I'm considering to replace a stop-and-waste valve in the basement, where copper pipes are installed. So I need to clean the corrosion off the pipe. My question is if I could use fine-grained sandpaper ...
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1answer
2k views

remediate corroded fins on AC, if it possible - how?

The fins on my external AC seem to be heavily corroded by misplaced canine excretions: Two 50 lb male dogs, about 5 years worth of misplacment. As is, the AC cools the house more than adequately, ...
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1answer
81 views

How well does AA-8000 alloy resist pitting corrosion?

Aluminum corrosion in salty environments often takes the form of a surface pitting -- while this does little to damage the structural value of the aluminium, it can be an issue for mating contexts. ...
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1answer
1k views

AC Coil Corrosion?

I looked at my outdoor AC unit yesterday and it looks like the coils are starting to deteriorate. I looked online and it looks like it's some kind of corrosion. Is this fixable at this point? Or is ...
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3answers
719 views

Are these blue spots on stove coil cups poisonous Verdigris?

I live in the USA and have one of these stoves: For me who comes from Europe, the design of these stove tops always baffles me compared to flat (metal or glass) stove tops seen across Europe (it ...
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3answers
4k views

What nails to use for PT wood?

I'm re-framing my first floor and using PT wood everywhere where there is a possibility of area being flooded. PT wood is your typical 2x4(s) from Home Depot MCA - micronized copper azole ...
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1answer
304 views

How can I treat or replace steel bolts in aluminum nuts to avoid corrosion?

I have a structure originally built from aluminum extrusion with channels using aluminum T-nuts and steel bolts. Over the years, the steel bolts have rusted, making them prone to stripping at the head ...
2
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3answers
907 views

Rust on copper pipe at strap

I have a few places on 1/2 copper water pipes in my basement that look rusted, right where a strap is. Should I be concerned enough about a leak to replace the line?
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1answer
240 views

Do I need to replace these metal support posts?

I have these 3 permanent lally support posts in the basement: post #1 post #2 post #3 Closeup frame captured from video #1 Recently basement was flooded so I tore down drywall prepping things ...
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1answer
341 views

hot water tank corrosion

I am getting corrosion on my hot water tank connections that looks like electrolysis. I have a water purification system and it has been tested and working properly. I have a lightning protection ...
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3answers
2k views

Copper pipe through cinder block wall: corrosion issue

The pipe in the picture runs from my oil tank through my basement wall and to the outside (guessing it's the vent pipe for when they fill the tank). Should I be concerned about what it going on at ...
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1answer
1k views

Can't remove single handle shower handle

I have a Delta Monitor Multichoice 13/14. Removed the hex screw but handle will still not come off. I tried all kinds of twisting and banging on it. Some people suggested rotating the handle past 180 ...
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1answer
2k views

Why does this toilet valve have corrosion on it?

I had a question about some corrosion on my toilet water supply line. I've provided a picture below. What I was wondering are a few things. 1) What is the reason for this? Why would a valve start ...
2
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1answer
573 views

Brass tub overflow pipe stuck in brass tee. How can I remove it?

I am repairing a tub overflow. The screws for the cover plate were very corroded and broke off. I am trying to remove the overflow fitting and pipe but it is stuck. The pipe is brass and slides into a ...
2
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1answer
162 views

What could cause corrosion in a water heater?

My water heater was replaced about 5 years ago. Recently I discovered some corrosion on some of the pipes and valves connected to the heater. Pictures are attached. I have yet to inspect the anode ...
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1answer
547 views

What could cause a 5 year old valves to corrode so quickly

Unlike this question, the hot water heater is not a factor as it is happening to joints all over the house. Further all joints are either copper on copper or brass on copper. I've taken over ...
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3answers
32k views

Does it matter what kind of pipe is used for a sink drain?

The drainpipe in our sink broke (corroded right through in several places). Not having the time to find my pipe wrench (much less actually replace the pipe) we called a plumber. The plumber replaced ...
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1answer
2k views

Corrosion on copper pipe: Is this a concern?

I came across some corrosion on a copper hot water line in our house: Is this a potential early warning sign of impending pipe failure? I did some research online and came across multiple ...
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1answer
5k views

What could cause my water to taste metallic after a water filter cartridge was changed?

About 20 years ago, we remodeled our home and had two water filters installed (downstairs and upstairs). They are stainless steel enclosures with carbon block filter cartridges inside. The brand is ...
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4answers
71k views

How can I unscrew my outdoor hose that is fused to the spigot? [closed]

I don't know my own strength. It seems either my spigot or hose is stripped or they are fused together from corrosion. How can I unscrew the hose from the spigot?
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1answer
649 views

Can hydrochloric acid vapors corrode nearby metal items?

I have a room where I exposed a brick wall and redid the mortar by tuckpointing. It look beautiful but the whitish residue from the mortar needs to be cleaned and the best way to do it is using ...
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2answers
7k views

How should I protect the metal of a power rack that's kept outdoors?

I plan on building a power rack for my home gym and was wondering what kind of metal/coating I should use when building it since it will be stored outdoors. Most commercial power racks are built using ...
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1answer
1k views

Could this corrosion be caused by faulty ground wiring?

What might cause slight corrosion atop a tankless water heater's copper topped element assembly? I checked all the grounding and reconnected the two element assembly grounding wires and ensured ...
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5answers
16k views

Should gloves be worn when working with concrete to prevent it from coming in contact with skin?

I was told recently that concrete is slightly corrosive. Should gloves be worn when using concrete or is it fine to handle concrete as long as its not done on a regular basis?
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1answer
362 views

Under what circumstances can aluminum be in contact with steel?

I understand galvanic corrosion and the chemistry which causes the reaction. But under what circumstances can they be in contact? On first impression I would think they could in a dry environment... ...
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6answers
43k views

What could be causing my water heater inlet pipe to corrode?

There is corrosion forming on the inlet and TP valve connections to my water heater; the outlet seems to be fine. More specifically, the nipples are what is corroding. I have read the copper pipe ...