Can You Use Galvanized Nails With Aluminum
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"Galvanic Corrosion betwixt Galvanized Steel and Aluminum"
An ongoing word beginning back in 2006 ...
2006
Q. Nosotros are installing anodized aluminum benches in a basketball gym. The supplier has provided galvanized steel brackets to be attached to the bench and zinc plated steel bolts from the bracket to the concrete.
Questions:
1) Volition the galvanized bracket be sufficient to prevent the corrosive interaction betwixt the steel and the Aluminum?
two) Past attaching the steel bracket direct to the concrete, will that provide sufficient grounding to prevent the electrolysis?
Ronald McKenzie CEF
consultant - Huntington Beach, California
^
2006
A. Hello, Ronald. To my cognition the grounding neither accelerates nor retards galvanic action; I recollect that role is irrelevant as long as you are not introducing additional materials.
A galvanic corrosion cell can be likened to a dry cell battery for ease of understanding:
- The two metals in your construction (aluminum and zinc) act similar the carbon and zinc in a bombardment, with their deviation in electrochemical potential providing the driving force. Depending on the particular aluminum alloy, this potential deviation betwixt it and the zinc might be around 0.2 volts rather than the 1.5 volts potential difference between carbon and zinc.
- Ambient moisture and accumulated salts play the role of the conductive glop in a battery. Unless bleach is used for cleaning, or some other unusual circumstance, the environment will probably be adequately dry and non-conductive.
- Physically connecting the 2 metals without insulators between them is like connecting the positive and negative poles of a bombardment with wire. When it's practical to apply insulators you should, and so there is no possibility of galvanic corrosion.
I have seen somewhat similar construction to what you speak of -- galvanized steel and anodized aluminum -- used in outdoor structure with no problem as long every bit abroad from the sea, so it should exist even less of a problem in indoor employ. That is probably because zinc and aluminum are pretty close galvanically and anodized aluminum has a non-conductive anodized film on it which limits the metallic-to-metal contact. But where I've seen it, galvanized U-Bolts clamped to the aluminum, and then there was less disruption of the anodized movie than if you drill it, exposing blank aluminum, and screw it together. But if the bolts are large I would use galvanized bolts rather than zinc electroplated bolts; and if they are pocket-size (and consequently affordable) I would use stainless steel bolts.
It'due south also important to realize that "good enough" always depends on circumstances. Galvanized bolts on aluminum bleachers is 1 thing, and is probably okay, especially indoors, but galvanized bolts tin can absolutely not exist used to connect aluminum aircraft parts. Good luck.
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pine Embankment, New Bailiwick of jersey
^
2006
A. I agree with Mr. Mooney. On indoor applications such as this, galvanized and zinc plated hardware shouldn't pose a real threat. However, if you wanted to get one step further to ensure that galvanic corrosion will not be a problem, I recommend looking into zinc/aluminum dispersion coatings. These thin, dry moving picture coatings protect the steel from blood-red rust while diffusing the bi-metal cell created when the steel hardware comes in contact with the aluminum.
Rex Drummond
- Cleveland, Tennessee
^
2006
Q. I realize the battery-like aspects of galvanic Interaction of dissimilar metals. With regards to the grounding I was thinking about the grounding that is used on Microwave towers and the Guy Wires attached to a copper ground. I wonder if grounding a bench would give the current a path to travel instead of sacrificing the metal. The purpose would exist to effect the interaction betwixt the galvanized steel and the soil. Guy lines on towers would have more stray current.
I feel confident that the anodized surface would provide enough insulation though.
Ronald McKenzie CEF [returning]
consultant - Huntington Beach, California
^
A. How-do-you-do, Ronald.
Unlike sorts of systems are grounded for various reasons, not necessarily to prevent galvanic corrosion. But you could take a car battery, and ground either pole (simply non both), without effecting its functioning, and I think the same is truthful of a galvanic prison cell battery.
Regards,
Ted Mooney , P.Eastward.
Striving to live Aloha
finishing.com - Pino Beach, New Jersey
^
2007
Q. I take a new 5th wheel RV with aluminum window frames. The screws property the windows had begun to rust and at present in that location is a crystalline growth extending out from various areas of the track the window slides forth. Some screws have literally disintegrated. I also have power loss from my twelve volt batteries. Could this electrolysis exist caused from the grounding of the electric circuit or is it probable to exist caused by a contact to a live wire, maybe a screw puncturing a live wire?
Lyle A Balfour
Consumer - Revelstoke, BC, Canada
^
Aluminum greenhouse on galvanized footers
May 18, 2009
Q. I have an aluminum sided greenhouse to install and my question is this: Tin can I fix galvanized steel footers and commodities the aluminum siding directly to the footers without worrying nigh corrosion? Is there a improve way to brand this connection?
Leslie Fay
jeweler/metalsmith - silvery bound, Maryland
^
May 20, 2009
A. Attaching aluminum siding to steel should be washed with non-metallic [ed. note: i.e., insulated] stainless steel fasteners, or a peculiarly coated grade 5 fastener to prevent not only normal corrosion of the fastener just also a phenomena called hydrogen assisted stress cracking corrosion. You may consider using an isolator betwixt the aluminum and steel besides, it will serve the dual purpose of being a thermal interruption should you determine to insulate the wall and condition the enclosed space. You didn't say if the steel is galvanized, or what the finish on the aluminum is to be. All of those make a divergence in the answer.
Paul Griese
- Canton, Connecticut
^
Tent frames of mixed aluminum and galvanized structure
May 10, 2011
Q. I am looking to change out my galvanized tent frames and fittings to aluminum. I will not be able to do them all at once, is at that place any danger mixing the galvanized fittings with the aluminum poles in the acting? The tents are exposed to both sunday and rain.
Too, would PVC fittings be durable and sturdy enough to use with aluminum poles to construct frames supporting up to 30 lbs dispersed over an area of 100-125 square feet.
Trice Ray
- Bridgetown, Barbados
^
May 12, 2011
A. Hi, Trice.
I can't answer the question about the PVC fittings, and don't have a clear motion-picture show of what you are asking, but maybe some other reader will.
Any fourth dimension two unlike metals are actually touching each other (metallic to metal contact) in a damp surround, yous have some potential for galvanic corrosion. Nonetheless, the seriousness of the state of affairs is widely variable and depends on the awarding. For example, it would be admittedly unacceptable in a jetliner. Merely I have seen galvanized and aluminum railings and fittings mixed together in many cases with no serious consequences; I would be very surprised if you got any galvanic corrosion if the poles are touching; if they are non touching, y'all cannot. Expert luck.
Regards,
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pino Beach, New Jersey
^
Electrolysis between aluminum solar panels and galvanized frames
2002
Q. Volition electrolysis occur when aluminum is in contact with galvanized steel?
Craig Horner
solar energy - Chico, California
^
2002
A. Yeah, while aluminum and zinc (the galvanized terminate) are fairly shut together in electrochemical activeness in the seawater series, they are non close enough. Galvanic compatibility with aluminum is ane of the things that helped keep cadmium around for so long despite its toxicity.
Truthful compatibility is accomplished by making it all zinc coated or all aluminum, but practiced anodization of the aluminum will aid a lot. The $64,000 question, of form, is what are the details of the application?
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pine Embankment, New Jersey
^
March 15, 2012
Q. I would like to ask a Question about solar panels. Usually we make a solar installation with a projected lifespan of 25 years; currently we use aluminum framed panels and hot zinc dipped " galvanized " framing to mountain the panels on with stainless steel bolts. My question, of course there is some acrid in pelting, and it rains quite a lot here, likewise on top of factories other pollutants that are corrosive may be expected.
For a 25 year life bridge, what would be recommended? Nylon spacers to keep the panels and frame dissever? Or are there better materials we can use? Or volition information technology not be an effect?
Thanks for your time!
Arjen Helder
solar panels - Xiamen, Cathay
^
August 25, 2010
Q. Hi,
Nosotros manufacturer a solar racking system that utilizes galvanized (hot dipped or pre-galvanized) Unistrut. The solar panels are anodized (typically blackness). We use stainless bolts to attach the panels to the unistrut. The bolts attach through the aluminum mounting holes that are exposed aluminum. Will a galvanic reaction occur with this configuration? This is beingness installed on flat commercial roof space and fully exposed to the elements.
Elie Rothschild
manufacturer - SF, California
^
Baronial 26, 2010
A. Dear Elie Rothschild,
The answer is: YES.
The only question mark is the fourth dimension span in which this will occur. I wouldn't exist surprised if within a year or a few years the connection is lost, merely I accept no practical experience with your actual situation(s). The Al will deliquesce preferentially.
If y'all have the possibility to isolate the RVS from the Aluminium, due east.g. by using a teflon seal, that will already profoundly reduce the hazard for a devastating galvanic couple to occur.
If y'all could apply fasteners from the same material, that would fifty-fifty exist a better solution, although still a potential divergence will occur, due to the fact that the two surfaces are never equal and due to cleft corrosion.
Best regards,
Harry van der Zanden
- Budapest, Hungary
^
A. Hi. I agree with Harry, simply only partially...
You need a conductive liquid for galvanic corrosion to occur and I have heard several stories that when the but liquid that the joint is exposed to is rainwater, information technology's really not a problem. Of course, this could be tempered by whether the installation expanse is well-nigh the body of water or an industry that could create strong acrid rain.
If the holes were predrilled and were anodized, rather than existence bare every bit you mention, I recollect the problem would exist very minor. In view of the exposed aluminum in the holes, I think insulating bushings and washers should exist used.
Regards,
Ted Mooney , P.Due east.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^
July 12, 2012
Q. Can anyone help me with this trouble: the covering is just nigh xviii months old, and there are already black rust spots appearing (between one/2 " and 3" across) in different areas, the whole length of roofing nether the solar panels drip lines also accept major white rust or oxidation occurring?
Jesse Willetts
- Daintree, QLD, Commonwealth of australia
^
June 25, 2014 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread
Q. We have been mounting solar panels of various kinds (typically anodized aluminum framed) on standard, off the shelf, galvanized Unistrut channel. This allows for very cost effective, structurally audio installations.
Recently, a concern virtually the materials mix was brought to my attending. I accept never seen any problems in the field, but our oldest installations are barely ten years in service.
Any words of wisdom on the discipline?
Thanks
Marcus Maedl
solar installer - San Diego, California, United states
^
March 31, 2012
Q. I am starting to manufacture a mild steel product that volition be zinc, nickel or powder coated. Will the nickel or zinc coating be strong enough to resist corrosion when it is placed up against an aluminum support? We are leaning towards nickel. Will the corrosion be there withal but over a longer menstruum of fourth dimension? The other reason nosotros are leaning towards nickel is that it in exposed to route salt in parts of the country. Thanks
Bruce Robinson
New Manufacturer - Regina Saskatchewan, Canada
^
April 4, 2012
A. Hullo Bruce.
When dissimilar materials are in contact with each other, it becomes a matter non only of picking corrosion resistant finishes, simply finishes that are galvanically compatible with each other. For this reason, zinc would probably exist better than nickel when in contact with aluminum, since they are reasonably close together in the galvanic series.
A thin zinc plating will not be enough. I would suggest either zinc plating plus powder blanket (which may reduce or eliminate the galvanic corrosion), or hot dip galvanizing (i.e., a thick coating of zinc).
Regards,
Ted Mooney , P.Due east.
Striving to live Aloha
finishing.com - Pino Beach, New Jersey
^
Galvanized nails with zincalum roofing
Baronial 5, 2012
Q. I have zinc alum covering sheets. Nosotros accept access to galvanized steel nails for fastening the sheets to the rafters. Is this going to crusade trouble before long? What trouble? Would it be amend to try to buy zinc alum nails or some other metal?
Marilyn Stein
- Waiyevo, Taveuni, Fiji
^
June 2014
A. Howdy Marilyn. I take no personal feel with that, but I have heard that the zinc alum panels are pretty good at "diffusing" any galvanic issues with galvanized materials.
Regards,
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pino Embankment, New Jersey
^
September 4, 2012
Q. My question is regarding a project I am currently doing, I would like to fasten Corten Steel to an aluminum frame, the steel will be the cladding for my garage door and the aluminum is the back up frame holding the cladding. As Corten is a naturally corroding steel will it be an issue to fix this to the aluminum or is the business concern regarding the bolts, if so should I apply Stainless or galvanized bolts to mitigate this?
David Latimer
- Melbourne, Victoria, Commonwealth of australia
^
November 12, 2012
A. Hello Mr Latimer,
As its been ii months since yous posted your question, I do hope that you lot used Stainless Steel bolts and non the zinc coated ones as the zinc could possibly play a spoilsport somehow. SS is more like the Corten Steel in a fashion of its alloying elements and the zinc would exist inviting problem.
Khozem Vahaanwala
Saify Ind
Bengaluru, Karnataka, India
^
June 2014
A. Hullo. I call back I'd want to use fiberglass screws/bolts or insulators on metal bolts in this case.
Regards,
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^
December 25, 2012
Q. Howdy, would at that place exist any corrosion bug using hot dipped galvanised steel stair stringers with aluminum step treads bolted on? Which bolts would be the all-time to use?
Barb Stevens
- Montville, QLD, Commonwealth of australia
^
December 28, 2012
A. Hot dip Galvanized Bolts would be the best in your case.
Khozem Vahaanwala
Saify Ind
Bengaluru, Karnataka, India
^
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