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Black oxide hardware coating

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iagsxr

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Has anyone here recoated OEM hardware black oxide? I'm interested in hearing your results mainly in regards to corrosion resistance. I have ten bumper mounting bolts for my truck I'd like to do.

The Caswell stuff seems expensive, so I thought I'd try this:


Then also, I thought I'd use the leftover solution on a steel-topped workbench.
 
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T45

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iagsxr said:
Has anyone here recoated OEM hardware black oxide? I'm interested in hearing your results mainly in regards to corrosion resistance. I have ten bumper mounting bolts for my truck I'd like to do.

The Caswell stuff seems expensive, so I thought I'd try this:


Then also, I thought I'd use the leftover solution on a steel-topped workbench.
Click to expand...
It requires significant heat + proper chemistry, so its something you Ideally would farm out to a 3rd party. They will run a large batch and put your stuff in with it. Cold chemistry is not industrial/black oxide finsih its something cosmetic. I'd think also about the price out new hardware, and put the cost of re-finishing vs buying new parts into perspective. Maybe its possible to score a deal or catch a sale or whatever.
 
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GirlnAgarage

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I I haven't black oxided-ed...I've done bluing and parkerizing, but it has been in the gunsmith arena, not automotive. Can't speak to the longevity of it for a long term exterior/outdoors environment.
 
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iagsxr

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PCustoms said:
Black oxide offers little to no corrosion protection.
Click to expand...

So a lot of OE hardware is black oxide but I suppose that's more for bolts that get painted or dry locations on the car. Phosphate coating would be more what I'm after.

Going to research the cost of new OEM hardware tonight. I think I'm over the DIY coating idea.
 
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danielbuck

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I've seen some hardware that was coated with black cerakote. I think a lot of times it's done for heat, but it's also corrosion resistant, at least to some extent I guess. I don't know how DIY that is, or how expensive it would be to ship the hardware out to get coated, but that's something else you could look into.
 
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Chipm

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I did some tools not long ago with a homebrew rust-blue recipe and they turned out great. The best part is you probably already have all the supplies in your kitchen. Google it, but if I remember it is basically vinegar and salt. Rust it, then boil it to blacken. Repeat until it looks good.
IMG_7798.jpeg
 
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Bigblue&Goldie

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lilscorpion said:
Nope, agreed. Hardware that comes pre-coated rusts almost instantly in outdoor use-cases. I’d get stainless black oxide for outside.
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I'll be honest, I didn't even know there was stainless black oxide, I'll have to give it a whack as even here in AZ standard steel black oxide stuff will rust.
 
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iagsxr

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So here's my resolution:

I could get OEM bolts for $8.00/ea. They list for $12/ea. $96 for bolts that can't be seen once the bumper is installed just didn't do it for me.

I wire wheeled the bolts, cleaned them with acetone, and painted them with Rustoleum gloss black that I already had. I'll touch up the heads after instalation if need be.

Not the most elegant solution, but I'm calling them done.
20260305_083216.jpg
 
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