In the article I read, in the results part. There are graphs of corrosion current density (Icorr) of different samples that has been immersed in SBF solutions.
Dear Dr. Zatul Faqihah Salaha ,
the current density (Icorr, often expressed in μA / cm2) is sometimes a way of evaluating the extent of uniform corrosion of a metal in a specific aqueous solution and is generally calculated by means of specific electrochemical measurements. It represents an index of the corrosion rate of the material being analysed, being able to derive from it, through the Faraday equation, the corrosion rate of the material being corroded (often expressed in mg/(dm2 x day).
As well-known, a higher value of the corrosion current density indicates that a substrate has less resistance to corrosion.
My best regards, Pierluigi Traverso.
Dear Dr. Pierluigi Traverso, I appreciate your answer, thank you.
The corrosion current density determines the degree and the speed of stray current corrosion. A method combining electrochemical experiment with the machine learning algorithm was utilized in this research to study the corrosion current density under the coupling action of stray current and chloride ion.
Let us denote the weight decrease after corrosion as W.
According to the well-known Faraday Law, that weight change after an electrochemical processes such as corrosion or electroplating is
W = (M*I*t/(n*F)*eff). where I the corrosion current.
The current density is I/A, where A is the surface area under corrosion.
Corrosion current density is a measure of the rate at which metal corrodes or deteriorates in a given environment. It is defined as the amount of electrical current flowing between the corroding metal and a reference electrode per unit area of the corroding metal.
Corrosion current density is a measure of the rate at which metal corrodes in a given environment. It is typically expressed in units of amperes per unit area, such as mA/cm2 or μA/cm2
Corrosion current density is determined by measuring the current flowing between the corroding metal and an electrode in the same electrolyte solution. The current density is proportional to the rate of corrosion, and can be used to predict the corrosion rate of a material under specific conditions.
The corrosion current density is influenced by a number of factors, including the chemical composition of the metal, the nature of the electrolyte, the temperature, and the presence of other ions or contaminants in the environment. It is an important parameter in corrosion studies and can be used to evaluate the effectiveness of corrosion inhibitors and other protective measures.
When a metal is immersed in a liquid (electrolyte), it adopts an electrode potential (also known as corrosion potential). The variance in potentials between the two metals results in a potential difference, which is responsible for the movement of electrons from the anode to the cathode.
The magnitude of the corrosion current in the system is proportional to the potential difference. That is, the greater the potential difference, the greater the corrosion current generated, and therefore the more severe the rate of corrosion at the anode.
Corrosion current density shows the rate at which metal corrodes in a given environment and it shows the amount of electrical current flowing between the corroding metal and a reference electrode per unit area of the corroding metal.
Corrosion current density is the measure of the rate at which a metal corrodes in a given environment. It is typically expressed in units of amperes per square meter (A/m²). In simple terms, it is the amount of electric current that flows as a result of the corrosion reaction taking place on the surface of the metal.
In the paper that you read the graphs of corrosion current density (Icorr) are likely showing the rate at which each sample is corroding in the simulated body fluid (SBF) solution over time. The corrosion current density is often used as a measure of the corrosion rate, with a higher Icorr indicating a faster corrosion rate. By comparing the Icorr values of different samples, researchers can assess which materials are more resistant to corrosion in the specific SBF solution being used. This information can be useful in determining the suitability of different materials for use in medical implants or other biomedical applications where resistance to corrosion is critical.
Corrosion current density is a measure of the rate at which metal corrodes in a given environment. It represents the flow of electrons from the metal to the surrounding electrolyte during the corrosion process.
More specifically, corrosion current density is defined as the amount of current that flows per unit area of metal surface when it is immersed in an electrolyte. It is typically measured in microamps per square centimeter (μA/cm²) or milliamps per square meter (mA/m²).
To measure corrosion current density, the metal sample is usually polarized with a small potential difference (a technique called potentiostatic or potentiodynamic polarization) and the resulting current is measured. The corrosion current density can then be calculated using Faraday's law of electrolysis, which relates the amount of current flowing to the amount of metal that is being corroded.
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