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P2 etch creating black "smut" residue on high-silicon aluminum casting alloy
Hi, Ron. You're right to be surprised, I would be too. The EDS and SEM are relatively new and are calibrated regularly. It is also used reliably every day for failure analysis. I have not seen a reason yet to doubt the EDS detector/analyzer. There may be sulfur present, but in trace...- millimillenary
- Post #7
- Forum: Paint/coatings engineering
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P2 etch creating black "smut" residue on high-silicon aluminum casting alloy
We put a sample in our SEM and ran EDS. Main elements present: aluminum (obviously), but also silicon, oxygen, and some magnesium, but no sulfur. The amount of silicon present on the surface is far beyond the 10wt% in the alloy. We thought that maybe our P2 etch bath had contaminants which...- millimillenary
- Post #3
- Forum: Paint/coatings engineering
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P2 etch creating black "smut" residue on high-silicon aluminum casting alloy
P2 etch (ferrous sulfate, sulfuric acid, DI water, 160F, 25 minutes) is needed on aluminum at my facility prior to application of a structural primer paint on the aluminum. This is fine on wrought aerospace alloys like 2024, 6061, 7075. Today we tried an alloy similar to an A356 aluminum...- millimillenary
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- Replies: 7
- Forum: Paint/coatings engineering
