Typically the pH of BFW is conditioned to 9. According to e.g. the ASM handbook, the corrosion rate of iron in water should be constant between a pH of 7 and 9. Wouldn't a pH of 7 be sufficient to mitigate corrosion in a boiler system?
Hi,
If the ph in the water blow 8.5 that May be will cause an acid attack.the effect exhibits rough pitted surfaces.the presence of iron oxide deposits on boiler surfaces can encourage this kind of corrosion.
Well,
You need water sample analysis, and using phreeqC software, using following classification to be decide.
Langelier Saturation Index (LSI) = pH – pHs.
Index Value Indication (Carrier 1965)
2.0 Scale forming but non corrosive
0.5 Slightly scale forming and corrosive
0.0 Balanced but pitting corrosion possible
-0.5 Slightly corrosive but non-scale forming
-2.0 Serious corrosion
Ryznar Stability Index (RI)=2pHs-pH
Interpretation of the Ryznar Stability Index (Carrier 1965)
4.0-5.0 Heavy scale will form. If RI
- Badges
- Science topic
- Similar topics
- Biological Science
- Biochemistry
- Biochemical Techniques
- Analytical Chemistry
- pH