Moat Pitting after Bright Dip of aluminum extrusion
Moat Pitting after Bright Dip of aluminum extrusion
(OP)
I know that there have been studies performed in the past concerning this topic and I would like to be able to gather some information concerning it. MOAT PITS
We have a customer that, we believe, is using the wrong type of coolant/lubricant on there cutoff saw operation which, at times, causes us to problems in the anodizing process. The phenomena is Castle and Moat Pitting.
Does anybody have any links to information on the formation of these pits? I would greatly appreciate any help provided.
We have a customer that, we believe, is using the wrong type of coolant/lubricant on there cutoff saw operation which, at times, causes us to problems in the anodizing process. The phenomena is Castle and Moat Pitting.
Does anybody have any links to information on the formation of these pits? I would greatly appreciate any help provided.





RE: Moat Pitting after Bright Dip of aluminum extrusion
"Sounds like castle & moat pitting. It could be in the billet, but more likely in extrusion. It is a defect of metal homogenization and secondarily of cooling. Alloy metals precipitate differently in different portions of the extrusion leaving insoluble intrusion (castle) and easily dissolved aluminum around it (moat.)"
ht