plating, anodizing, & finishing Q&As since 1989
How does DI water affect a cleaning process?
August 27, 2010
I was considering using DI water during a cleaning process. However, given that pure water, specifically DI, may act as an acid in presence of a strong base (e.g. detergent), how may it affect the cleaning? I mean, can it become acidic enough as to neutralize part of the detergent and jeopardize the cleaning results? I know that DI water becomes more acidic if in contact with CO2, but to what extent?
Thanks for your help. I really enjoy reading your answers; I learn so much from them!
process engineer - Guaynabo, Puerto Rico
Dear Cg Gdiaz
Harry van der Zanden
- Budapest, Hungary
Most people use softened water or DI water for critical cleaning of electronic parts, and DI water for rinses for spot-free rinsing, and a surface free of ionic contamination. You needn't be concerned about the pH effect of DI water. Since it has no buffering, it will not affect pH of the cleaner.
consultant - Cleveland Heights, Ohio
September 20, 2010
Go for it - DI water will only help your processes. The purer the make-up water the better.
R&D practical scientist
Chesham, Bucks, UK
September 23, 2010
Every respondent is right, only a little explanation. DI water becomes acidic because of its hunger to dissolve anything and CO2 is readily available. Once you add the alkaline cleaner the hunger is satiated and the pH considerably raised. This purer mixture is more efficient than its contaminated counterpart made with tap water.
Monterrey, NL, Mexico