What gets dissolved in the electrolyte solution during Electropolishing of Stainless Steel Grade 316
What gets dissolved in the electrolyte solution during Electropolishing of Stainless Steel Grade 316
(OP)
Hello Everyone,
Would someone here please let me know what gets dissolved in the electrolyte solution during Electropolishing of Stainless Steel Grade 316?
Thanks.
Would someone here please let me know what gets dissolved in the electrolyte solution during Electropolishing of Stainless Steel Grade 316?
Thanks.
RE: What gets dissolved in the electrolyte solution during Electropolishing of Stainless Steel Grade 316
The Fe ends up at much higher proportion in the electrolyte than it is in the alloy.
The Fe is roughly 75% of the alloy but closer to 85-90% of the dissolved metals.
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P.E. Metallurgy, Plymouth Tube
RE: What gets dissolved in the electrolyte solution during Electropolishing of Stainless Steel Grade 316
Regards.
RE: What gets dissolved in the electrolyte solution during Electropolishing of Stainless Steel Grade 316
@Ed: when you mentioned 85-90%, did you mean the metals deposited on the cathode? Fe ions concentration in electrolyte will start from 0 to some percentage, that seems not be comparable to the source metal. Also, I think 316 is about 65%Fe. There are tens of 316 versions, Fe content varies, but all of them seem unlikely go as high as 75%.
RE: What gets dissolved in the electrolyte solution during Electropolishing of Stainless Steel Grade 316
RE: What gets dissolved in the electrolyte solution during Electropolishing of Stainless Steel Grade 316
RE: What gets dissolved in the electrolyte solution during Electropolishing of Stainless Steel Grade 316
There are two things going on in EP.
1. Asperities (high points) are removed due to higher local current density.
2. Selective dissolution of Fe from the top few atomic layers of metal.
At 16%Cr, 10%Ni, and 2%Mo you are over 70% Fe. I exaggerated a little.
So if about 1/2-2/3 of the metal dissolved is average chemistry and the rest is nearly all Fe then the dissolved metals will have Fe up in the 80+% range.
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P.E. Metallurgy, Plymouth Tube