Cadmium Plated Bolts
Cadmium Plated Bolts
(OP)
Anyone ever use cadmium plated bolts? What are the structural design ramifications of using this?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Cadmium Plated Bolts
http://www.finishing.com/4000-4199/4144.shtml
This is another article describing some basic behavior of cadmium plated bolts. Is takes a military point of view but has some good information.
http://www.pfonline.com/articles/029905.html
This article has some more properties of coatings, specifically about 1/5th of the way down the page is a section called "Properties of the Deposited Metal Coatings
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It appears to me that a big difference between cadmium plating ans zinc plating is the ability of the plating to resist corrosion, one metal being better than the other for a given environment. The other difference I've noticed most is the different torque requirements for tightening nuts for each metal plating type.
I'm by no means an expert, though, so others will actually have experience with this. Did you find the same links I did?
RE: Cadmium Plated Bolts
RE: Cadmium Plated Bolts
RE: Cadmium Plated Bolts
One thing to be aware of is the difference in their ability to be tensioned to certain torque values relative to either HDG or uncoated bolts. They are a bit more "slippery" than either of the others, so if you torque them using a calibrated wrench method you will typically achieve required tension at lower torque values. If the testing lab is only using a torque wrench and not calibrating with a Skidmore-Wilhelm device, then they will often require torque values that they see using HDG or plain bolts, which will result in a fastener that might be overtensioned.
RE: Cadmium Plated Bolts
In terms of bolting, corroded zinc-plated bolts often snap when trying to undo nuts that are seized due to formation of a voluminous white corrosion product (ZnO + Zn(OH)2 plus sometimes carbonate) on the threads.
Never heard of this happening with cad plated.