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Measuring pH on metallic planar surface

  1. Dec 14, 2015 #1
    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!
     
  2. jcsd
  3. Dec 14, 2015 #1

    DrDu

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    My first thought would be to use and indicator in combination with a spectrophotometer.
     
  4. jcsd
  5. Dec 14, 2015 #2
    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: Dec 14, 2015
  6. Dec 14, 2015 #3

    DrDu

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    Science Advisor

    The choice of the indicator will depend on the pH range you are interested in.
     
  7. Dec 14, 2015 #4
    Dear DrDu, thank you for your insight. Let me find out what is the pH forecast range.
     
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