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# Polarization Resistance Test

This Direct Current (DC) Test may also be termed Linear Polarization Resistance (LPR).

*current in Amps*) - in the above Figure is linear (

*not logarithmic*). The slope of the curve has units of resistance - hence the term

*Polarization Resistance*(R

_{p}). The tangent to the curve at E

_{corr}defines the Polarization Resistance (R

_{p}).

If you know the Tafel slopes, it is possible to define i

_{corr}as follows:

i_{corr} = (ß_{a} ß_{c})/2.3(ß_{a}+ ß_{c}) • (1/R_{p})

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Page last updated: 7/11/19