Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Zinc die casting parts black spot after finishing
Q. We have zinc die casting parts, after vibro finishing the parts are dried in oven on which we are facing black spots, using corn cob is having 100% clogging problem due to that we have adopted this process.
Kindly suggest which way to avoid the black spot problem.
Regards,
Managing Director - Bangalore, Karnataka, India
2007
A. Sounds like a chemical compound reaction problem during your deburring cycle. Two things. Check the chemical compatibility of the product to zinc. Second, try adding a 5 to 15 minute straight water rinse cycle to deburring before trying to dry. About drying. You might want to clean parts in hot water or use a hot air blower on parts before oven to reduce dwell time
AF Kenton
retired business owner - Hatboro, Pennsylvania
2007
Q. We are facing black spots problem in zinc die casting parts after shot blasting in few days in rainy season. these black spot increase as the time passes. Please suggest, How we can solved this problem.
VIKAS SinghGROZ - Gurgaon, haryana India
August 16, 2019
Ed. note: Sorry, this RFQ is old & outdated, so contact info is no longer available. However, if you feel that something technical should be said in reply, please post it; no public commercial suggestions please ( huh? why?)
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