|
 |
|
This type of corrosion occurs when dissimilar (different) metals or alloys
are in the presence of an electrolyte (Moisture can be classified as an
electrolyte). All carbons, graphites, metals, & alloys have different
electrical voltage potential. Galvanic corrosion occurs when dissimilar
metals or alloys are in intimate contact near to or in an electrolyte. When
similar metals are used galvanic corrosion is eliminated. When it is
necessary to use dissimilar metals within a system the materials should be
selected as near to each other on the galvanic series list as possible to
reduce the potential voltage between the materials. The current density
corresponds to the level of voltage between the materials. When the current
density is lower, the rate of galvanic corrosion is less. The galvanic
series is a list of metals in descending order of electrical potential. The
list starts at the top with the least noble materials (lowest resistance to
galvanic corrosion), and ends with the most noble materials. In product
design the portion of the product with the largest exposed surface area
should be comprised of the least noble material. |
Magnesium
Magnesium Alloys
Zinc
Beryllium
Aluminum 1100, 3003, 3004, 5052, 6053
Cadmium
Aluminum 2017, 2024, 2117
Steel 1018,1038, or Wrought Iron
HSLA Steel, Cast Iron
Chrome Iron (active)
430 Stainless (active)
302, 303, 321, 347, 410, 416 Stainless Steel (active)
Ni-Resist Cast Iron
316, 317 Stainless (active)
Carpenter 20Cb-3 Stainless (active)
Aluminum Bronze (CA 687)
Hastelloy C, Inconcel 625, Titanium (active)
Tin
Inconel 600 (active)
Nickel (active)
Inconel Nickel-Chromium Alloy (active)
Hastelloy B (active)
|
Naval Brass (CA 464), Yellow Brass (CA 268)
Red Brass (CA 230), Admiralty Brass (CA 443)
Copper (CA 102)
Manganese Bronze (CA 675), Tin Bronze (CA 903 & CA 905)
410, 416 Stainless (passive) Phosphor Bronze (CA 521 & CA 524)
Silicon Bronze (CA 651 & CA 655)
Nickel Silver (CA 732, 735, 745, 752, 754, 757, 765, 770, 794)
Copper Nickel 90-10
Copper Nickel 80-20
430 Stainless (passive)
Copper Nickel 70-30
Nickel Aluminum Bronze (CA 630 & CA 632)
Monel 400, K500
Nickel (passive)
60% Ni 15% Cr (passive)
Inconcel 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, Incoloy 825 (passive)
Silver
Titanium, Hastelloy C & C276, Inconel 625 (passive)
Graphite
Zirconium
Gold
Platinum |
|
|
|
|
"Seal It With SEALTIGHT®Technology"
Protected By Multiple U.S. and
International Patents
All Contents ©1990 - 2009 Sealtight® Fastener, a subsidiary of B&B Hardware, Inc.
Sealtight® Fastener U.S. Patent NOS: 5,957,641; 6,231,286; 6,283,691; 08/683, 83 |
 |
|
