Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site

Chime right in! (no registration req'd)

-----

"Pitting of hot dipped Galvannealed parts during e-coating"



February 5, 2010

Am experiencing a pitting problem on the underside of a spring seat on a shock absorber. Am running a PPG black cathodic e-coat. Paint Temp. is >92 degrees F, conductivity is 1150 us. pH 5.68. Parts are four to a hanger (vertical) Am only getting the pitting on the top part. The other three parts are unblemished. Top part enters the bath last and exits first, least amount of dwell time on this part. Why is this affecting only this part and not the others. The actual damper tube is CRS, and this is not being affected. Only the galvanneal component part is pitted.

Chuck Colwell
Sr. E-Coat Tech. - Sunbury, Oh, USA
^


March 10, 2010

Dear Mr Colwell,

It may be correct to assume that the top part is not getting enough time in your permeate rinses. You should increase the time in the permeate rinses and see if the pitting reduces; It may be worthwhile to get a solvent analysis for the E Coat bath as well.

Khozem Vahaanwala
Khozem Vahaanwala
Saify Ind
supporting advertiser
Bengaluru, Karnataka, India
saify logo
^

none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start 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:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA