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 \
Platinum	0	130	250	340	350	430	450	570	600	685	700	770	800	840	940	1000	1090	1100	1200	1400	1470	1950
Gold/Carbon	130	0	110	210	220	300	320	440	470	535	570	640	670	710	810	870	960	970	1070	1270	1340	1620
Stainless Steel	250	110	0	90	100	160	200	320	350	415	450	520	550	590	690	750	840	850	950	1150	1220	1700
Titanium	340	210	90	0	10	90	110	230	260	325	360	430	460	500	600	680	750	760	860	1060	1150	1610
Silver-Mercury	350	220	100	10	0	80	100	220	250	315	350	420	450	490	590	650	740	750	850	1050	1120	1600
Nickel	430	300	180	90	80	0	20	140	170	235	270	340	370	410	510	570	650	670	770	970	1040	1520
Copper Alloy	450	320	200	110	100	20	0	120	150	215	250	320	350	390	490	530	640	650	750	950	1020	1500
Copper	570	440	320	230	220	140	120	0	30	95	130	200	230	270	370	430	520	530	630	830	900	1380
Al-Brz-Brs 30% Zn¹	600	470	350	260	250	170	150	30	0	65	100	170	200	240	340	400	490	500	600	800	870	1350
Silicon	665	535	415	325	315	235	215	95	65	0	35	105	135	175	275	335	425	435	535	735	805	1285
Brass 50% Zinc	700	520	520	360	350	270	250	130	100	35	0	70	100	140	240	300	390	400	500	700	770	1250
Bronze	770	640	550	430	420	340	320	200	170	105	70	0	30	70	170	230	320	330	435	630	700	1180
Tin	800	670	590	460	450	370	350	230	200	135	100	30	0	40	140	200	290	300	400	600	670	1150
Lead	840	710	680	500	490	410	390	270	240	175	140	70	40	0	100	160	250	260	300	560	630	1110
Light alloy NSA 3001	940	810	690	600	590	510	490	370	340	275	240	170	140	100	0	60	150	160	260	460	530	1010
Steels	1000	870	750	660	650	570	550	430	400	335	300	230	200	160	60	0	90	150	200	400	470	950
Aluminum A5	1090	960	840	750	740	650	640	520	490	425	390	320	290	250	150	90	0	100	110	310	380	860
Cadmium	1100	970	850	760	750	670	650	530	500	435	400	330	300	260	160	150	100	0	100	300	370	850
Chromium	1200	1070	950	860	850	770	750	630	600	535	500	430	400	360	260	200	110	100	0	200	270	750
Zinc	1400	1270	1150	1050	1050	970	950	830	800	735	700	630	600	560	460	400	310	300	200	0	70	550
Manganese	1470	1340	1220	1150	1120	1040	1020	900	870	805	770	700	670	630	530	470	380	370	270	70	0	480
Magnesium	1950	1620	1700	1610	1600	1520	1500	1380	1350	1285	1250	1180	1150	1110	1010	950	860	850	750	550	480	0

1: Aluminum-Bronze Brass 30% Zinc
Values obtained from 1997 Huber+Suhner "RF Connector Guide"

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