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Mikerobe

Veteran

Green Turtle Cay,Abaco, Bahamas.

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I,ve just recently had a steel rotor hub for one of my helis chromed. Then I read about this possibility online.
Is this a disaster waiting to happen? Chime in, if you're experienced in this field.

The lot I got is not a lot, but I thank God a lot for the lot I got!

01-21-2017 04:01 AM
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MartyH

rrProfessor

USA

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Can you find out if the part was baked immediately after being plated? That helps reduce the effect. Otherwise, I think you are right to be concerned. What does the plater say about it?

01-23-2017 08:11 PM
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Mikerobe

Veteran

Green Turtle Cay,Abaco, Bahamas.

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I found out about hydrogen embrittlement only after having the rotor hub chromed.
I haven't spoken with the plater since the job was done...didn't have a second thought at the time!
Is this something an experienced plater would relay to a customer? He was aware that this was an RC Helicopter component, however, he probably has no idea of the importance of a rotor hub nor the stresses exacted thereupon!

The lot I got is not a lot, but I thank God a lot for the lot I got!

01-24-2017 04:02 AM
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MartyH

rrProfessor

USA

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No, I doubt a plater would discuss it with a customer unless they asked. I'm no expert myself but I work with surface treated components in industry and know just enough about this to know you should ask the plater if they baked the part or performed any other operation I've not heard of to reduce the potential for excessive hydrogen embrittlement in your part. There is no doubt some has occurred. It's really a matter of what was done to reduce it.
I think if I was a sport flyer I'd not get too excited but if you're really spinning the blades up, smacking the heli around and ever fly near people, unless I could demonstrate to myself the part was safe, I'd scrap the part. That's just me speaking. I have a modest net worth and I'm a conservative person (age 54 now) so I have something to protect and I'm a protective sort of person to begin with.

01-24-2017 11:00 AM
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Dee Flies 3D

Senior Heliman

Farmington Hls, Mich - USA

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Enbrittlement is typically more a problem with Alloy steels - (regarding Chromium & Molybdenum), 4100 4300 & 6100 series mostly. We see it when doing heat-treating to these steels, and state to protect for Hyd Embrittlement in our process. It shows-up the worst when trying to treat the steel to it's hardest potential. Unless it's an alloy steel part with thin cross sections, the plating process shouldn't do too much strengh-wise.
If it IS a sensitive alloy, the repetitive stress cycling could cause stress cracking, then a failure..

01-24-2017 05:02 PM
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MartyH

rrProfessor

USA

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A rotor hub would definitely be considered to have thin cross sections. As to being an alloy steel, I don't know.

01-24-2017 06:14 PM
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Doug

Elite Veteran

Port Saint Luice Florida....

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Was it "hard chrome" or "decorative" (copper or nickle under the chrome)?

First member of Member of Bearings Anonymous

01-24-2017 07:08 PM
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Mikerobe

Veteran

Green Turtle Cay,Abaco, Bahamas.

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Was it "hard chrome" or "decorative" (copper or nickle under the chrome)?
I don't know. They did polish the part, I can tell by the rounded edges.
The job was done in Florida...I'm now back home in the Bahamas. I don't feel comfortable asking the plater questions about a job I thought was well done at the time.
I guess I should've done more research before committing to having this done in the first place.
The hub is for a Schluter Champion. It's a steel hub and was originally finshed with what I believe is a black oxide coating. I was able to remove this very quickly using Ospho metal primer.
I don't think it would've been necessary for Schluter to have given these over to hardening. After removing the coating there was no indication of rainbowing as is common on other hardened steels I'm familiar with.

The lot I got is not a lot, but I thank God a lot for the lot I got!

01-24-2017 10:28 PM
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Dee Flies 3D

Senior Heliman

Farmington Hls, Mich - USA

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I remember that heli - the hub is not any special alloy. It should not be an issue.. AND prob will look alot better than the Black

01-25-2017 08:07 PM
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