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Hydrogen Embrittlement

Hydrogen Embrittlement

Hydrogen Embrittlement

(OP)
Hey all,

I have bent galvanized rods that I am going to be testing for strain-age embrittlement. I would like to first remove the zinc layer via HCL prior to testing, and I don't want to introduce any other forms of embrittlement. Since it is A36 steel, is it safe to assume that hydrogen embrittlement won't be an issue?

Thanks,
Mike

RE: Hydrogen Embrittlement

You want to test for embrittlement and you want to use an acid dip to strip the finish off the parts. Even though A36 is not particularly suseptable to embrittlement, I would not trust any test results you would get after this process.

RE: Hydrogen Embrittlement

Quote:

Since it is A36 steel, is it safe to assume that hydrogen embrittlement won't be an issue?

No. I agree with the advice above.

RE: Hydrogen Embrittlement

If it passes it is a moot point, but no guarantee ...

RE: Hydrogen Embrittlement

Bake it after stripping
then test

then test a part that is not stripped.

Mfgenggear

RE: Hydrogen Embrittlement

(OP)
I agree with the above and I'd rather not use chemicals to remove the zinc. The HDG is on a 5/8" section of threaded rod and I'm wondering what the best way is to remove this layer mechanically...thread chasers perhaps?

RE: Hydrogen Embrittlement

it would be easier to mfg new parts with out plate.mechanical stripping is possible but it will remove parent material.
chase threads, then aluminum oxide blast to strip.

chemical; stripping in my opinion will work if baked after.
add test samples to test for embrittlement

those are the options

Mfgenggear

RE: Hydrogen Embrittlement

(OP)
Why can't I just use a die nut? I'm only trying to remove zinc coating so that the fixtures can screw in properly. I will leave the coating in tact on the rest of the part where failure will occur...

RE: Hydrogen Embrittlement

mxracer

yes that will work, LOL
I was interpreting that all the zinc plating needed to be removed.

Mfgenggear

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