Magnesium Magnesium Alloys Zinc Beryllium Aluminium 1100, 3003, 3004, 5052, 6053 Cadmium Aluminium 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) Ni-Resist 316, 317 Stainless (active) Carpenter 20Cb-3 Stainless (active) Aluminium Bronze (CA687) Hastelloy C (active) Inconel 625 (active) Titanium (active) Lead/Tin Solder Lead Tin 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 Aluminium Bronze (CA630, 632) Monel 400, K500 Silver Solder Nickel (passive) 60% Ni 15% Cr (passive) Inconel 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) Silver Titanium (passive), Hastelloy C & C276 (passive) Graphite Zirconium Gold Platinum

LEAST NOBEL - ANODIC / ACTIVE (MOST LIKELY TO CORRODE)

MOST NOBEL - CATHODIC / PASSIVE (LEAST LIKELY TO CORRODE)

Galvanic Corrosion is an electrochemical process in which one metal corrodes preferentially to another when both metals are in electrical contact, in the presence of an electrolyte. Metals close to one another on the chart generally do not have a strong effect on one another, but the farther apart any two metals are separated, the stronger the corroding effect on the one higher in the list.   This list represents the potential available to promote a corrosive reaction, however the actual corrosion in each application is difficult to predict. Typically, the presence of an electrolyte (water for example) is necessary to promote galvanic corrosion (order may change depending on the actual environment).