Half Cell Potentiometer

Product Details:

Half cell potentiometer 
Corrosion is a natural process that occurs when a structure is exposed to elements like CO2 or chloride, which can penetrate the concrete all the way to the steel reinforcement. This can have serious durability and safety consequences, which is why it is important to monitor corrosion using an accurate and trusted method.The half-cell potential test is the only corrosion monitoring technique standardized in ASTM C876 – 15 , IS-516 for youtub video links https://youtu.be/c4JL77qhAdc?si=OLZq1Hm3hOEs6KpZ
Purpose of half cell potential test: 

To detect whether corrosion activity of the steel reinforcement is actively occurring.

To assess the probability of corrosion in the steel reinforcement.

To locate corrosion prone areas across the concrete surface

Monitor the effectiveness of protection measures.

Standard Procedure: overview (As per ASTM C876, IS 516)

Half-Cell Potential (V vs Cu/CuSO₄)
Corrosion Probability
Corrosion Risk
More positive than -200 mV
< 10% (low probability)
Very low
-200 mV to -350 mV
10–90% (uncertain probability)
Moderate / Uncertain
More negative than -350 mV
> 90% (high probability)
High

Factors influencing half cell potential test:
a) Concrete Moisture Content: The amount of moisture in concrete significantly affects half-cell potential readings. Dry concrete can produce less negative (more positive) potentials, giving the false impression of low corrosion risk, whereas properly moist concrete provides more accurate readings.
b) Type, Condition, and Coverage of Steel Reinforcement: The nature of the steel, its coating (if any), and the thickness of the concrete cover influence potential measurements. Well-protected or deeply embedded steel may show less negative potential even when corrosion is present.
c) Temperature and Environmental Conditions: Temperature variations and environmental factors such as humidity can alter the electrochemical behavior of steel and concrete, affecting potential readings.
d) Surface Preparation and Contaminants: Proper surface cleaning is necessary for good electrical contact. Dust, chlorides, or other surface contaminants can interfere with electrode connection and distort results.

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