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Baja Forums -:- VW Volkswagen Bug, Baja, Bus, Sandrail and Thing -:- VW Volkswagen & Baja Bug General Discussion -:- Black Oxide
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Black Oxide
Bug, Baja, Thing and Buggies. Most every thing that will not fit any any other area. See list of other Forums for better topic placement...Volkswagen General Discussion
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JVAZ
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Post Post subject: Black Oxide
Posted: Wed Aug 10, 2011 01:26 AM
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Has anyone ever coated a king pin with black oxide? Since it is bare metal I thought it might be a good idea, however all the king pins I see are left bare. Is there any problem with coating it?

Maybe it's too thick and the king pin won't fit back through the combo spindle?

Here is a link with more info on black oxide.

www.swdinc.com/black_oxide.htm

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Post Post subject: Re: Black Oxide
Posted: Tue Aug 16, 2011 05:42 PM
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I suspect it is a cosmetic coating. Note they state you have to keep it oiled of painted with clear to keep the finish. If you keep them greased they won't rust. You can do the same with a battery charger and water. Google rust removal by electrolysis.

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MojaveRacer208
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Post Post subject: Black Oxide
Posted: Tue Aug 16, 2011 06:51 PM
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Perrib is right. It's primarily cosmetic. And while it is more rust resistant than bare steel, it will still rust through after a while. You may note that crankshafts aren't oxide coated either. Both are intended to live in petroleum based lubricants. If you're referring to a Combo Link rather than a standard kingpin, the exposed portions of those are typically painted after assembly to prevent corrosion.

Another note is that the oxide coating like chrome plating or most any other surface coating of the sort, adds to the surface. Thus a kingpin will grow in diameter. This is no real problem as the bushings get reamed to fit. And the bore of the spindle can be reamed as well.

So why are you thinking of oxide coating on kingpins? Hard chrome plating such as used on shock shafts would make far more sense to me.


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JVAZ
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Post Post subject: Re: Black Oxide
Posted: Tue Aug 16, 2011 09:29 PM
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Here is the part. Maybe I am calling it the wrong thing. I have a combo spindle.



If it's not going to hold up then I guess it makes since to just leave it bare and keep it oiled. I thought the oxide coating would be better than chrome plating because of the thickness of the black oxide. I figured coating it with black oxide would be negligible as far as the added thickness.

At the end of the day, if it's just going to come off or wear through, then it doesn't make since and that would explain why I haven't seen it done before. Thanks for the input guys.

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Post Post subject: Re: Black Oxide
Posted: Wed Aug 17, 2011 12:29 AM
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That is the king pin. Once assembled some paint can't hurt. Mine are finished rat style rust, paint and grease. Smile

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MojaveRacer208
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Post Post subject: Black Oxide
Posted: Wed Aug 17, 2011 08:31 PM
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Yeah, actually a "Combo Link" in that it is the King pin and the Link serving both purposes with one piece.

If your spindle assemblies use bushings for the spindle, the plating thickness can be compensated for by reaming the bushings to fit. No big deal, whether it's black oxide or hard chrome. You DEFINITELY do NOT want flash chrome, which is what is used on bumpers, bathroom fixtures, bicycle handlebars, etc., that will make the steel brittle and prone to break easy.

If your spindles use needle bearings, plating of any sort will alter the diameter enough to cause trouble for the bearings.

Black Oxide is soft and doesn't take wear.

I recommend painting it after the spindle is assembled on it and the link bushings installed and reamed.


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