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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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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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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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