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Electrochemical Potentials

In electrochemistry, the electrochemical potential, , sometimes abbreviated to ECP, is a thermodynamic measure that combines the concepts of energy stored in the form of chemical potential and electrostatics. Electrochemical potential is expressed in the unit of J/mol. -- Wikipedia

This table presents the electrochemical potential difference (in mV) for pairs of common metal alloys, when in the presence of water with 2% salt content.




 the "X" metal is attacked
 the contact is practically neutral
 the "Y" metal is attacked


 \
   \
      \    X
         \
           \
       Y     \
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Platinum01302503403504304505706006857007708008409401000109011001200140014701950
Gold/Carbon13001102102203003204404705355706406707108108709609701070127013401620
Stainless Steel250110090100160200320350415450520550590690750840850950115012201700
Titanium3402109001090110230260325360430460500600680750760860106011501610
Silver-Mercury35022010010080100220250315350420450490590650740750850105011201600
Nickel430300180908002014017023527034037041051057065067077097010401520
Copper Alloy45032020011010020012015021525032035039049053064065075095010201500
Copper570440320230220140120030951302002302703704305205306308309001380
Al-Brz-Brs 30% Zn1600470350260250170150300651001702002403404004905006008008701350
Silicon66553541532531523521595650351051351752753354254355357358051285
Brass 50% Zinc700520520360350270250130100350701001402403003904005007007701250
Bronze77064055043042034032020017010570030701702303203304356307001180
Tin800670590460450370350230200135100300401402002903004006006701150
Lead840710680500490410390270240175140704001001602502603005606301110
Light alloy NSA 30019408106906005905104903703402752401701401000601501602604605301010
Steels100087075066065057055043040033530023020016060090150200400470950
Aluminum A51090960840750740650640520490425390320290250150900100110310380860
Cadmium11009708507607506706505305004354003303002601601501000100300370850
Chromium120010709508608507707506306005355004304003602602001101000200270750
Zinc14001270115010501050970950830800735700630600560460400310300200070550
Manganese1470134012201150112010401020900870805770700670630530470380370270700480
Magnesium1950162017001610160015201500138013501285125011801150111010109508608507505504800
1: Aluminum-Bronze Brass 30% Zinc
Values obtained from 1997 Huber+Suhner "RF Connector Guide"

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