KAPLAN
- Aluminum
- Zinc
- Iron/Steel
- Stainless Steel
- Tin
- Lead
- Brass
- Copper
- Bronze
- Gold
- Zinc
- Galv. Steel
- Alum.
- Steel
- Stainless Steel
- Lead
- Tin
- Copper Alloys - Bronze/Brass
- Copper
Which list is correct?
The Ballast book question 36 on the practice exam then asks, "Aluminum windows are specified for installation in a masonry wall. Which material is the least desirable choice for flashing at the head of the window?
A. Alum.
B. Copper
C. Stainless Steel
D. Lead
Answer: stainless steel
But if you look at either list copper is the furthest away so shouldn't the answer be copper?
Stainless steel is the least desirable. copper has less galvanic action than SS.
Dissimilar metal corrosion is the name given to the corrosion which results when two different metals are coupled together to form a basic wet corrosion cell. It is also frequently called bimetallic corrosion, or galvanic corrosion, because the corrosion is primarily galvanic in nature. However, the last name is something of a misnomer because all aqueous corrosion is caused by the galvanic effect. The corrosion problems associated with the coupling of dissimilar metals have been appreciated for over two hundred years yet dissimilar metal corrosion is still rife throughout the engineering world. In a report to the Admiralty in 1763 it was suggested that when it was necessary to couple dissimilar metals they should be insulated from each other, but even when this sound advice is carried out, problems still arise.
Originally published August 1997
Listed below is the latest galvanic table from MIL-STD-889. I have numbered the materials for future discussion of characteristics. However, for any combination of dissimilar metals, the metal with the lower number will act as an anode and will corrode preferentially.
The table is the galvanic series of metals in sea water from Army Missile Command Report RS-TR-67-11, "Practical Galvanic Series."
The Galvanic Table
Active (Anodic)
Inspectapedia
Galvanic Corrosion Chart
1958 Seagram Building Mies Van Der Roe, Philip Johnson
1889 The Eifel Tower
1885 1931 William Le Baron Home Insurance Company Building
1851 Joseph Paxton: Crystal Palace
1850 Henry Bessemer inventions
List of materials properties
Dissimilar metal corrosion is the name given to the corrosion which results when two different metals are coupled together to form a basic wet corrosion cell. It is also frequently called bimetallic corrosion, or galvanic corrosion, because the corrosion is primarily galvanic in nature. However, the last name is something of a misnomer because all aqueous corrosion is caused by the galvanic effect. The corrosion problems associated with the coupling of dissimilar metals have been appreciated for over two hundred years yet dissimilar metal corrosion is still rife throughout the engineering world. In a report to the Admiralty in 1763 it was suggested that when it was necessary to couple dissimilar metals they should be insulated from each other, but even when this sound advice is carried out, problems still arise.
Corrosion Control - Galvanic Table
Lee ErbOriginally published August 1997
Listed below is the latest galvanic table from MIL-STD-889. I have numbered the materials for future discussion of characteristics. However, for any combination of dissimilar metals, the metal with the lower number will act as an anode and will corrode preferentially.
The table is the galvanic series of metals in sea water from Army Missile Command Report RS-TR-67-11, "Practical Galvanic Series."
The Galvanic Table
Active (Anodic)
- Magnesium
- Mg alloy AZ-31B
- Mg alloy HK-31A
- Zinc (hot-dip, die cast, or plated)
- Beryllium (hot pressed)
- Al 7072 clad on 7075
- Al 2014-T3
- Al 1160-H14
- Al 7079-T6
- Cadmium (plated)
- Uranium
- Al 218 (die cast)
- Al 5052-0
- Al 5052-H12
- Al 5456-0, H353
- Al 5052-H32
- Al 1100-0
- Al 3003-H25
- Al 6061-T6
- Al A360 (die cast)
- Al 7075-T6
- Al 6061-0
- Indium
- Al 2014-0
- Al 2024-T4
- Al 5052-H16
- Tin (plated)
- Stainless steel 430 (active)
- Lead
- Steel 1010
- Iron (cast)
- Stainless steel 410 (active)
- Copper (plated, cast, or wrought)
- Nickel (plated)
- Chromium (Plated)
- Tantalum
- AM350 (active)
- Stainless steel 310 (active)
- Stainless steel 301 (active)
- Stainless steel 304 (active)
- Stainless steel 430 (active)
- Stainless steel 410 (active)
- Stainless steel 17-7PH (active)
- Tungsten
- Niobium (columbium) 1% Zr
- Brass, Yellow, 268
- Uranium 8% Mo.
- Brass, Naval, 464
- Yellow Brass
- Muntz Metal 280
- Brass (plated)
- Nickel-silver (18% Ni)
- Stainless steel 316L (active)
- Bronze 220
- Copper 110
- Red Brass
- Stainless steel 347 (active)
- Molybdenum, Commercial pure
- Copper-nickel 715
- Admiralty brass
- Stainless steel 202 (active)
- Bronze, Phosphor 534 (B-1)
- Monel 400
- Stainless steel 201 (active)
- Carpenter 20 (active)
- Stainless steel 321 (active)
- Stainless steel 316 (active)
- Stainless steel 309 (active)
- Stainless steel 17-7PH (passive)
- Silicone Bronze 655
- Stainless steel 304 (passive)
- Stainless steel 301 (passive)
- Stainless steel 321 (passive)
- Stainless steel 201 (passive)
- Stainless steel 286 (passive)
- Stainless steel 316L (passive)
- AM355 (active)
- Stainless steel 202 (passive)
- Carpenter 20 (passive)
- AM355 (passive)
- A286 (passive)
- Titanium 5A1, 2.5 Sn
- Titanium 13V, 11Cr, 3Al (annealed)
- Titanium 6Al, 4V (solution treated and aged)
- Titanium 6Al, 4V (anneal)
- Titanium 8Mn
- Titanium 13V, 11Cr 3Al (solution heat treated and aged)
- Titanium 75A
- AM350 (passive)
- Silver
- Gold
- Graphite
Inspectapedia
Galvanic Corrosion Chart
1958 Seagram Building Mies Van Der Roe, Philip Johnson
1889 The Eifel Tower
1885 1931 William Le Baron Home Insurance Company Building
1851 Joseph Paxton: Crystal Palace
1850 Henry Bessemer inventions
List of materials properties
