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Galvanic Corrosion Chart

Electricity is generated from the difference in potential of disimular metals. All metals have a particular potential and a ranking from the most passive (lowest potential - platinum), to the most active (highest potential - magnesium). When placed together the more active metal of the two will dissolve (ionize). The farther apart the two metals are on the galvanic series, the greater the difference in potential and the stronger the dissolution process will be. For example: Steel pipe, without the protection of a galvanic insulator, will show the highest rate of corrosion at connections to copper.

ANODIC END (Most Likely to Corrode)
Magnesium Alloys
Aluminum 1100, 3003, 3004, 5052, 6053
Aluminum 2017, 2024, 2117
Mild Steel 1018, Wrought Iron
HSLA Steel, Cast Iron
Chrome Iron (active)
430 Stainless (active)
302, 303, 321, 347, 410, 416 Stainless Steel(active)
316, 317 Stainless (active)
Carpenter 20Cb-3 Stainless (active)
Aluminum Bronze (CA687)
Hastelloy C(active) Inconel 625(active) Titanium(active)
Lead/Tin Solder
Inconel 600 (active)
Nickel (active)
60% Ni 15% Cr (active)
80% Ni 20% Cr (active)
Hastelloy B (active)
Naval Brass (CA464), Yellow Brass (CA268)
Red Brass (CA230), Admiralty Brass (CA443)
Copper (CA102)
Manganese Bronze(CA675), Tin Bronze(CA903, 905)
410, 416 Stainless(passive) Phosphor Bronze(CA521, 524)
Silicon Bronze (CA651, 655)
Nickel Silver (CA 732, 735, 745, 752, 754, 757, 765, 770, 794
Cupro Nickel 90-10
Cupro Nickel 80-20
430 Stainless (passive)
Cupro Nickel 70-30
Nickel Aluminum Bronze (CA630, 632)
Monel 400, K500
Silver Solder
Nickel (passive)
60% Ni 15% Cr (passive)
Iconel 600 (passive)
80% Ni 20% Cr (passive)
Chrome Iron (passive)
302, 303, 304, 321, 347 Stainless (passive)
316, 317 Stainless (passive)
Carpenter 20Cb-3 Stainless (passive), Incoloy 825 (passive)
Titanium (passive), Hastelloy C & C276 (passive)
CATHODE END (Least Likely to Corrode)