Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

The authoritative public forum
for Metal Finishing since 1989
-----

Undesirable colorations in zinc finishes

Our company is having one of our products Zinc plated per ASTM B633, Type 3 with clear chromate conversion service class 2. After several rinses the parts have yellow streaks on the sides of the parts after drying. The plating company is assuring me that this is normal. Our customer (Dell Computer) doesn't like the yellow streaking. Any ideas on preventing this from happening.

Thanks,

Ron Durham
- Denver, Colorado
2002

It may be normal for them, but that doesn't means it's necessary :-)

I would visit the shop and, as a first simple step, make sure that they have air agitation in the rinses following the chromate.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2002

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: