Sudden high pH in e-coat bath

September 19, 2008

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 24, 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.

Harry Parkes
- Birmingham, West Midlands, United Kingdom

September 25, 2008

Hi Chet,
If the coating quality/properties are unchange, I suspect the pH meter. Electrodes are easily contaminated and give errors.
Harry Parkes

Harry Parkes
- Birmingham, West Midlands, United Kingdom