Continued from page 24


Figure 4. Investigative approach digging deeper clarifying corrosion mechanisms.


Generally SGS is following an investigative approach shown in Figure 4 covering several variables to be varied such as temperature, materials, preparation and shelf life to get a detailed overview about correlation effects which might take place.


Being able to use different kind of metal electrodes and checking almost each working fluid, combinations as shown


in Figure 5 can be used for analyzing corrosion tendencies.


EIS bundled with various methods such as REM, EDX and ICP-OES, correlation of electrochemistry with optical- and elemental analysis reveals detailed information about corrosion mechanisms pinpointing problems which may occur in everyday applications.


Electrochemical impedance spectroscopy is capable analyzing additive performance, metal compatibility covering inhibitors (e.g. Cu-Inhibitors), metal surface passivation, coating formed, activation temperatures of e.g. sulfur carriers and activation energies of corrosive matter.


Therefore EIS assists revealing important information concerning additive treat rates, corrosion mechanisms and correlative material effects. EIS can be used to make the right decisions formulating lubricants and choosing materials mastering challenges of tomorrow.


For further information please contact:


SGS Germany GmbH – Technical Customer Service


Am neuen Rheinhafen 12 a D-67349 Speyer t +49 6232 1301 - 44 f +49 6232 1301 - 49 de.tcs.speyer@sgs.com


Figure 5. Strategy investigating corrosion effects combining different materials, formulations and temperatures.


LINK www.sgsgroup.de


26


LUBE MAGAZINE NO.130 DECEMBER 2015


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