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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 \ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | 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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