No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

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

Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Sudden High pH in E-Coat Bath

My e-coat bath jumped from a PH 6.1 TO 6.7 in one day. My DI water appears good. My paint supplier is performing bacteria test. Any other ideas?

Chet Sweatman
Paint Manager - Georgia
September 19, 2008

Hi Chet,
Has there been a change in the appearance or thickness of the coating or opacity of the bath? If not I would suspect the pH meter. ED resins can cause severe fouling of pH electrodes and subsequent significant errors.

If the coating quality/properties are unchanged, I suspect the pH meter. Electrodes are easily contaminated and give errors.

Harry Parkes
- Birmingham, UK
September 24, 2008

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

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: