I am working on corrosion test with an electrochemical jar test.
Working electrode: Copper
Reference electrode: Ag/AgCl with 3M KCl solution
Counter electrode: graphite
In the process of linear polarization, the LSV staircase graph does not appear in a form that allows me to accurately analyze the corrosion rate. While I did not encounter this problem previously when conducting the same test with the same equipment and system, I am currently experiencing a deviation in the graph. Can anyone help me with what the possible cause might be? (In the attachment, visual illustrates the situation I'm referring to.)
First of all, my colleague performed polarization in the Tafel range. At higher anode potentials, copper in solution shows the beginning of passivation. Try to limit the scope of the analysis and determine the parameters of the Tafel curve - also the corrosion rate. Linear polarization is a method that uses very small polarizations relative to the corrosion potential of +/- 20 mV. So I propose to repeat the measurement and present, first of all, the result on a double-linear scale rather than a linear-logarithmic scale.
stefan
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