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
-----

Zinc coating peels off from electrogalvanized metal sheet

I'm a Quality Engineer at Metal Stamping company. My problem is our metal sheet coating peels off after stamping and degreasing processes. In stamping process, we using aliphatic based stamping fluid and in degreasing we are using hydrofoam petroleum based chemical. It happens only on certain qty and lots only.

Hope your can give us some ideas to overcome this problem.

Abas Bekri
Quality engineer - Malaysia
September 3, 2009

Hi, Abas. I doubt that the aliphatic or hydrofoam chemicals are seriously affecting the zinc coating. I believe that some lots have not been properly zinc plated and the zinc plating is coming off because of the handling and the stresses involved in stamping.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
September 4, 2009

(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: