Request for Quote:

Galvanic Corrosion

Galvanic corrosion potential is a measure of how dissimilar metals will corrode when placed against each other in an assembly. 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 (eg. water) is necessary to promote galvanic corrosion. Please see chart below.

Galvanic Corrosion Chart
Magnesium Anodic
Magnesium Alloys (least noble)
Zinc Corroded
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) Direction
Red Brass (CA230), Admiralty Brass (CA443) of attack
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)  
Zirconium Cathodic
Gold (most noble)
Platinum Protected