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Related Concept Videos

Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

804
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Potentiometry: Membrane Electrodes01:15

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Potentiometry: Overview01:06

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Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
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2.4K
Standard Electrode Potentials03:02

Standard Electrode Potentials

51.7K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Corrosion of Reinforcement01:27

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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
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Related Experiment Video

Updated: Mar 14, 2026

Potentiodynamic Corrosion Testing
08:43

Potentiodynamic Corrosion Testing

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Potentiodynamic Corrosion Testing.

Selin Munir1, Matthew H Pelletier2, William R Walsh2

  • 1Surgical and Orthopaedics Research Laboratories, Prince of Wales Clinical School; selin.munir@gmail.com.

Journal of Visualized Experiments : Jove
|September 30, 2016
PubMed
Summary
This summary is machine-generated.

This study details a cost-effective in vitro corrosion system for analyzing metallic biomaterials. It characterizes pitting corrosion by measuring electrochemical parameters like breakdown potential.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Biomaterials Engineering

Background:

  • Metallic materials exhibit distinct polarization characteristics influencing their corrosion behavior.
  • Understanding electrochemical parameters like open circuit potential and breakdown potential is crucial for identifying corrosion factors.
  • A reliable in vitro corrosion system is essential for systematic material characterization.

Purpose of the Study:

  • To establish and operate an in vitro potentiodynamic corrosion system for analyzing pitting corrosion.
  • To systematically characterize small metallic medical devices by determining their electrochemical parameters.
  • To provide an inexpensive technique for evaluating biomaterial corrosion resistance.

Main Methods:

  • Utilized a potentiodynamic polarization technique with a three-electrode setup (reference, counter, working electrodes).
  • Employed a stainless steel screw as the working electrode, Ag/AgCl as the reference electrode, and platinum mesh as the counter electrode.
  • Obtained a baseline potential, stabilized the corrosion potential (Ecorr), and ramped the applied potential positively.

Main Results:

  • The system successfully identified key electrochemical parameters dictating material polarization characteristics.
  • Breakdown potential and passivation potential were determined, offering insights into corrosion susceptibility.
  • The methodology allows for the systematic characterization of metallic materials in a corrosion environment.

Conclusions:

  • The developed in vitro corrosion system offers an inexpensive and reliable method for analyzing pitting corrosion in metallic biomaterials.
  • This technique enables a thorough understanding of a material's response to corrosion by characterizing its electrochemical properties.
  • The protocol is suitable for the systematic analysis of small metallic medical devices, aiding in material selection and performance prediction.