Measuring pH on metallic planar surface

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Discussion Overview

The discussion centers on the feasibility and methods for measuring pH levels on the wet surface of metals, particularly in the context of corrosion studies. Participants explore sensor probes and indicators suitable for this application, considering the presence of non-conductive protective layers.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • Some participants inquire about the feasibility of measuring pH on a planar surface, both dry and wet, and seek advice on suitable sensor probes.
  • One participant suggests using an indicator in combination with a spectrophotometer as a potential method for measurement.
  • Another participant requests recommendations for indicators, specifically those suitable for prolonged use over years.
  • It is noted that the choice of indicator may depend on the specific pH range of interest.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the best method or indicators for measuring pH on metallic surfaces, and multiple viewpoints regarding the feasibility and approaches remain present.

Contextual Notes

Limitations include the potential impact of non-conductive protective layers on measurement accuracy and the need for indicators that can withstand prolonged exposure without degradation.

Who May Find This Useful

Researchers and practitioners involved in corrosion studies, materials science, and electrochemistry may find this discussion relevant.

Patrick Rota
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We are currently trying to measure pH levels on the (wet) surface of metals as part of a study about corrosion.
The surface may have a non-conductive protective layer.

- is it feasible to measure pH on a planar surface (dry or wet)? Which kind of sensor probe can be used for this task?
- which order of magnitude will be the measure? (precision of the sensor)

Any advice would be greatly appreciated!
 
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My first thought would be to use and indicator in combination with a spectrophotometer.
 
Thank you DrDu, this is a great idea, indeed.
Can you recommend some indicator? Do you have suggestions?
EDIT: we need an indicator for prolonged use (years), if it exists
 
Last edited:
The choice of the indicator will depend on the pH range you are interested in.
 
Dear DrDu, thank you for your insight. Let me find out what is the pH forecast range.
 

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