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Snowflake corrosion on Duranodic anodized parts

Q. Good day,
I am working with our family business. We are having a problem with our black Duranodic anodize. We are getting snowflake corrosion (stray currents) on some of our parts. We cannot seem to figure out what is the culprit for these stray currents, but have noticed them a lot more on extruded material.

Brittany Morton
- Atlanta, Georgia
October 23, 2023

A. We can't say exactly the source of snowflake type corrosion's is stray current. But if you suspect stray current issue, then firstly you can check grounding of all baths in line (I assume all baths have been grounded). As I say I've encountered this problem a few times over the years; you should consider other possibilities which related chemical or out of chemical reasons, even extrusion process.

Good luck

Alaattin Tuna
- TURKEY,Sakarya
October 25, 2023

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