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Oxide on the stud

Hey, I have problems with only 1 part number, we have more than 150 part numbers with stud in the upper side, but only we have problems with a particular part number, after phosphating pretreatment the stud of this part number shows a dust with the appearance of the oxide, when we produce this part number, we have to decrease the pH of the Rinse Seal, but this is something I want to avoid, what could be the reason for this oxide in this particular part number?
Thanks

Luis Cárdenas
Aftermarket Automotive - Mexico
2006

Too many words but, unfortunately, too little information Luis.
What metal, shape, size and volume of parts are you talking about? What are you doing now, what is your actual sequence or process and chemicals used?

Guillermo Marrufo
Monterrey, NL, Mexico
2006

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