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<< Lancair Builders' Mail List >>
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Regarding corrosion and the results of using various materials next to one
another I thought I’d pass on the listing below which should be of interest
to builders.
Avoid having materials next to each other that are widely separated on the
listing below. Note too that the material at the corroded end of the chart
will do just that, corrode, when placed next to a material at the other end
of the chart.
Naturally anything that acts as an electrolyte only aggravates the process.
When I was in A&P school I had to build an aluminum wing rib as a project.
As an experiment I asked a commercial fisherman friend of mine to toss it
in the bow of his boat for a week. The result was almost no corrosion. I
took it back and riveted a copper penny to it and sent it back to the bow
of the boat. A week later the rib was badly corroded, particularly between
the penny and the aluminum.
Hope everyone finds this useful.
Ted Stanley - A&P-IA
GALVANIC SERIES OF METALS AND ALLOYS
CORRODED END ( ANODIC OR LEAST NOBLE)
MAGNESIUM
MAGNESIUM ALLOYS
ZINC
ALUMINUM 5052, 3004, 3003, 1100, 6053
CADMIUM
ALUMINUM 2117, 2017, 2024
MILD STEEL (1018), WROUGHT IRON
CAST IRON, LOW ALLOY HIGH STRENGTH STEEL
CHROME IRON (ACTIVE)
STAINLESS STEEL, 430 SERIES (ACTIVE)
302, 303, 321, 347, 410,416, STAINLESS STEEL (ACTIVE)
NI - RESIST
316, 317, STAINLESS STEEL (ACTIVE)
CARPENTER 20CB-3 STAINLESS (ACTIVE)
ALUMINUM BRONZE (CA 687)
HASTELLOY C (ACTIVE) INCONEL 625 (ACTIVE) TITANIUM (ACTIVE)
LEAD - TIN SOLDERS
LEAD
TIN
INCONEL 600 (ACTIVE)
NICKEL (ACTIVE)
60 NI-15 CR (ACTIVE)
80 NI-20 CR (ACTIVE)
HASTELLOY B (ACTIVE)
BRASSES
COPPER (CA102)
MANGANESE BRONZE (CA 675), TIN BRONZE (CA903, 905)
SILICONE BRONZE
NICKEL SILVER
COPPER - NICKEL ALLOY 90-10
COPPER - NICKEL ALLOY 80-20
430 STAINLESS STEEL
NICKEL, ALUMINUM, BRONZE (CA 630, 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 STEEL (PASSIVE)
316, 317, STAINLESS STEEL (PASSIVE)
CARPENTER 20 CB-3 STAINLESS (PASSIVE), INCOLOY 825NICKEL - MOLYBDEUM -
CHROMIUM - IRON ALLOY (PASSIVE)
SILVER
TITANIUM (PASS.) HASTELLOY C & C276 (PASSIVE), INCONEL 625(PASS.)
GRAPHITE
ZIRCONIUM
GOLD
PLATINUM
PROTECTED END (CATHODIC OR MOST NOBLE)
The Mc Nally Institute
1986 S. Belcher Rd. Clearwater, Florida 33764
Phone 727 535 6450 Fax 727 535 8150
E mail mcnally@earthlink.net
http://www.mcnallyinstitute.com/Charts/galvanic-series.html
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LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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