Alternative to Nital Etch Process?
Alternative to Nital Etch Process?
(OP)
I was wondering if there were any alternative nital etch process? We are not wanting to put acid on the part due to it being a primary part. We did have it on our plans to do. Although we want to find something else or remove it. If we remove it we have to find something to justify the removal. Or just find an alternative to Nital Etch. Does anyone know of something that might help in either removal or alternative?
Thank you for your help.
Thank you for your help.





RE: Alternative to Nital Etch Process?
The Nital etch is normally used on CS surfaces that have been polished.
RE: Alternative to Nital Etch Process?
Nital etching is also used for observing defects like grinding burn on bearings, gears, shafts, etc. Is this what you are referring to, or is it part of a metallographic examination for determination of microstructure (grain size, phase distribution, etc.)?
RE: Alternative to Nital Etch Process?
RE: Alternative to Nital Etch Process?
RE: Alternative to Nital Etch Process?
rp
RE: Alternative to Nital Etch Process?
RE: Alternative to Nital Etch Process?
I agree with the others, eddy current and barkhausen noise are possible non-destructive methods, but they require lots of development, time, etc., and still may not detect potential defects. Also, your customer quite possibly requires nital etching rather than NDT. If you want to reference a contemporary standard, MIL-STD-867C was revised in 2008:
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RE: Alternative to Nital Etch Process?
& so on.
just make sure to post embrittlement bake below the tempering temperture & what the specification requires.
RE: Alternative to Nital Etch Process?
Thanks TVP for that spec. I'll take a look at it.
Would there be a issue if there are some dim. that are + or - .0005 talerance? Not sure if that would be a issue with how much the acid would eat away at the part?
RE: Alternative to Nital Etch Process?
only temper etch once, & make sure the the etch times not violated. normally hold OD diameters at the high limit.
there will be very little stock removal if done correctly.
.00005" max or less
Mfgenggear