Measuring pH on metallic planar surface

In summary, the conversation discusses the feasibility of measuring pH levels on wet surfaces of metals for a study on corrosion. It is mentioned that a non-conductive protective layer may be present on the surface. The participants also inquire about suitable sensor probes and the precision of the measurements. Suggestions for using an indicator in combination with a spectrophotometer are made, and the need for a long-term indicator is mentioned. It is recommended to choose an indicator based on the desired pH range.
  • #1
Patrick Rota
3
0
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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  • #2
My first thought would be to use and indicator in combination with a spectrophotometer.
 
  • #3
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:
  • #4
The choice of the indicator will depend on the pH range you are interested in.
 
  • #5
Dear DrDu, thank you for your insight. Let me find out what is the pH forecast range.
 

1. What is pH and why is it important to measure on metallic planar surfaces?

pH is a measure of the acidity or basicity of a solution. It is important to measure pH on metallic planar surfaces because the pH can affect the corrosion rate of the metal and potentially impact its functionality and durability.

2. How is pH measured on metallic planar surfaces?

pH can be measured on metallic planar surfaces using a pH meter or indicator strips. The surface must be cleaned and free of any contaminants before taking the measurement. The pH meter or strips are then placed on the surface to determine the pH level.

3. What factors can affect the accuracy of pH measurements on metallic planar surfaces?

The accuracy of pH measurements on metallic planar surfaces can be affected by factors such as surface roughness, temperature, and the presence of other chemicals or substances on the surface. It is important to ensure that the surface is properly prepared and that the measurement is taken under controlled conditions.

4. What is the ideal pH range for metallic planar surfaces?

The ideal pH range for metallic planar surfaces is typically between 6 and 8. This range is considered neutral, meaning it is neither too acidic nor too basic. Maintaining a neutral pH can help prevent corrosion and maintain the functionality of the metal.

5. How often should pH measurements be taken on metallic planar surfaces?

The frequency of pH measurements on metallic planar surfaces will depend on the specific application and conditions. In general, it is recommended to take measurements regularly, especially in environments where the pH may fluctuate or where corrosion is a concern. This can help identify any potential issues and allow for proper maintenance and treatment if needed.

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