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Engineering Materials
Aluminum Wheels Take Higher Max Load Than Steel
10/5/2012

This Alcoa 45mm aluminum wheel for offset trailers is 37 percent lighter than a steel equivalent and has a maximum load per wheel of 5,000kg. (Source: Alcoa)
This Alcoa 45mm aluminum wheel for offset trailers is 37 percent lighter than a steel equivalent
and has a maximum load per wheel of 5,000kg.
(Source: Alcoa)

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Dave Palmer
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Re: Wheels, aluminum and steel.
Dave Palmer   10/9/2012 6:49:34 PM
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@William K.: I could be wrong, but I'm pretty sure that most OEM aluminum wheels have at least a clear chromate conversion coating on them.  This will not actually prevent corrosion, but the wheel would corrode a lot faster if it didn't have it.

Many aluminum wheels have multiple layers of coating: chromate, primer, silver topcoat, and clearcoat.  They may look like bare aluminum, but they're not.

Charles Murray
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Re: Steel vs. aluminum
Charles Murray   10/9/2012 7:38:20 PM
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Thanks, Dave. That makes sense. Now i have one more question: If we're essentially beefing up strength by using a thicker section, what does this do to the cost?

Dave Palmer
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Re: Steel vs. aluminum
Dave Palmer   10/10/2012 12:01:04 AM
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@Charles Murray: There's no question aluminum wheels are more expensive than steel wheels.  If they were cheaper, do you think Alcoa would go to the trouble of paying for a study to show how environmentally friendly they are?

Ann R. Thryft
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Re: Wheels, aluminum and steel.
Ann R. Thryft   10/10/2012 4:04:16 PM
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Here's a brief article, of uncertain provenance, that says "Most original equipment aluminum wheels are clear coated for corrosion resistance." http://autos.yahoo.com/maintain/repairqa/vehicle_exterior/ques129_0.html Here's a reference that looks more trustworthy: http://www.detailsupplyoutlet.com/pdf_files/tips.pdf It says "Most aftermarket wheels are made of aluminum alloy, whether they are polished, chromed, painted, cleared or powder coated & cleared." A brief discussion follows of various finishes. From the context, it appears that clear-coating is not universal.

Ann R. Thryft
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Re: Wheels, aluminum and steel.
Ann R. Thryft   10/10/2012 4:10:59 PM
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William, here's a link to the corrosion inhibitor blog we just posted:
http://www.designnews.com/document.asp?doc_id=252049
There's already a lively discussion going about corrosion and aluminum wheel coatings.

William K.
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Re: Wheels, aluminum and steel.
William K.   10/11/2012 9:23:02 AM
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Although there is undoubtedly some sort of anti-corrosion treatment applied to most OEM wheels, "the proof is in the performance." It certainly seems that the treatment is intended to last long enough for the car to be sold, and probably for th first year after that. But the person who gets the year-old trade-in is the one afflicted with the leaks. Of course, one other cause factor is the balance weights that are always installed, with the sharp-edged steel anchor tabs that will cut through any protective coating. Perhaps we need a new method of attaching balance weights to replace a system that came into use in the 1950's? Most other automotive technology has advanced a bit since then, after all.

Ann R. Thryft
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Re: Wheels, aluminum and steel.
Ann R. Thryft   10/11/2012 6:41:17 PM
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William, I'm curious to know if OEM steel wheels are treated with longer-lasting anti-corrosion coatings. Any idea?

William K.
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Wheels, aluminum and steel.
William K.   10/11/2012 8:00:42 PM
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My last vehicle with steel wheels was a 1985 Dodge van that I finally donated in 2003. The one time that I had to replace a damaged tire I did not see any rust or corrosion on the wheel except for the lug-bolt holes, which the paint came off when the nuts were torqued down. And I never had any rim leaks on those wheels, even after all of those years.The paint finish still was a good protector. And it probably was cheaper than whatever the aluminum wheels get.

Mydesign
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Re: Any need to replace Steel wheels by Aluminium wheels?
Mydesign   10/12/2012 1:06:36 AM
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Ann, how the wheels are relating to carbon emissions? Irrespective of wheel type (Steel or Aluminum), majority of carbon emissions are coming from Engine and type of fuels, am I right. In my previous comment I had raised another concern about weight bearing capacity per cubic cm.

Ann R. Thryft
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Re: Any need to replace Steel wheels by Aluminium wheels?
Ann R. Thryft   10/12/2012 11:57:16 AM
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Mydesign, the aluminum wheels are part of lightweighting efforts to reduce carbon emissions. Lighter weight vehicles use less fuel per mile, thus reducing carbon emissions produced per vehicle, per given time period. This is in response to US and European regulations for both consumer and commercial vehicles. Her are a couple of DN articles on US efforts:
http://www.designnews.com/author.asp?section_id=1366&doc_id=249877
http://www.designnews.com/author.asp?section_id=1392&doc_id=250828

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