No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

How often should you change a Zinc phosphate bath





Dear people, we have a supplier who makes the metal treatment (zinc phosphate coating) for us, we bond rubber to metal; since we were having problems with the bonding (rubber and adhesive do not stick on the metal), I started to visit our supplier on a weekly basis. Every two weeks, I found them cleaning and changing the zinc phosphate bath and they use to throw away all the sludge; I used to run a metal treatment bath some years ago and what I remember is that you don't change your bath that often and actually when you do it you keep some of the sludge to help balancing the bath.
How can we define a frequency of bath changing more accurately?

David Valdez
rubber to metal bonding - Reynosa Tamaulipas Mexico
April 12, 2011



You don't keep any portion of the sludge and not more than 5% of the clear old phosphate bath back when you make up a new bath.

Khozem Vahaanwala
Khozem Vahaanwala
Saify Ind
supporting advertiser
Bengaluru, Karnataka, India
saify logo
April 29, 2011



Hello,
Besides removing the sludge, it is necessary to do analysis for free acidity, total acidity and Fe and adjust the concentrations according to the phosphating chemical manufacturer's recommendations.

Ramajayam

Subramanian Ramajayam
Subramanian Ramajayam
consultant - Bangalore, India
December 31, 2011




(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:

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


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"