NACE Resource Center

Self Linear Polarization Resistance (SLPR)

Self Linear Polarization Resistance (SLPR), a truly revolutionary technique to analyze electrochemical noise signals. Assessment of the corrosion rate of a metal is of interest in many situations from monitoring industrial processes to fundamental research in laboratories. The corrosion rate of a metal can be measured electrochemically by determining its polarization resistance, which is inversely proportional to the corrosion rate. To try SLPR on your own EN results or get copy of recent papers published on the technique please contact our

Techniques that attempt to measure the polarization resistance can be divided into active and passive approaches. Active approaches, such as linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) require the metal to be externally polarized. The direct current technique, employed with LPR, disturbs the system during each measurement and this can promote changes to the metal over time. Electrochemical noise (EN) measurements allow the polarization resistance to be measured passively, i.e. without external polarization. EN measurements can also provide insights, both quantitative and qualitative, on the nature of localized corrosion events, which may be of greater interest than a measure of the overall corrosion rate.

However, the approaches proposed so far to relate the results of EN analysis to corrosion rates are all empirical with hardly any relation to the physical phenomena being measured, that is until we put together the SLPR.

To try SLPR on your own EN results or get copy of recent papers published on the technique please contact our

See also

• Kingston Technical Software
• KTS Thermo