Knowledge check (8 of 8)
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Lesson 08·Surface treatment
Surface treatment sequencing: nitride, PVD, polish, in what order
The build order that takes an H13 forge die from rough block to coated, polished, ready-to-run, and why getting any step out of sequence is a failure mode rather than a slow ramp to nominal life.
9 min readLesson 8 of 13
Knowledge check
A tool shop sends an H13 aluminum forge die out for AlTiN PVD at 48-50 HRC core, no nitride. The die runs 400 hits and the coating starts shedding in flakes from the high-pressure zones. The vendor says the substrate was prepped correctly and offers to recoat. Walk through what is actually wrong and what the correct build sequence would have been.