Hydrogen Embrittlement 1

[mxracer17788]

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

 

[Screwman1]

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.

 

[metengr]

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.

 

[Guest102023]

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

 

[mfgenggear]

Bake it after stripping
then test

then test a part that is not stripped.

Mfgenggear

 

[mxracer17788]

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?

 

[mfgenggear]

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

 

[mxracer17788]

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...

 

[mfgenggear]

mxracer

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

Mfgenggear