Ferd/289 Posted April 17, 2007 Share Posted April 17, 2007 can you use regular 'naked' steel bolts on an aluminum piece like a fuel rail? I thought steel galvanically acts with aluminum so I have always avoided using plain steel on aluminum. But now I am thinking that fasteners that have a coating of cadmium or what to me looks like 'black paint' on automotive type fasteners are ok to use on AL. can someone list the 'basic compatibilities' Quote Link to comment Share on other sites More sharing options...
Twoeightnine Posted April 17, 2007 Share Posted April 17, 2007 Cad plated hardware will work with all types of applications. Stainless will work with most applications. Especially if you use a sealer with them. Bare steel will corrode aluminimum in a hurry. Grade eight with cad plate....winner. Quote Link to comment Share on other sites More sharing options...
Guest JMo Posted April 17, 2007 Share Posted April 17, 2007 Sounds like the ones you have are Black Oxide coated. they are better than bare but only for a while. Use CAD, or Zinc coated and you'll be fine. or buy stainless. that won't cause any galvanic corrosion issues either. John Quote Link to comment Share on other sites More sharing options...
Administrators RTz Posted April 18, 2007 Administrators Share Posted April 18, 2007 ... or buy stainless. that won't cause any galvanic corrosion issues either. I've done this on a number of occasions and probably will continue to do so in some instances BUT... according to this chart, some alloy's of aluminum don't play well with some alloy's of stainless. The farther apart the metals are (on the chart) the less compatible they are... 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 Noble (Less Active, Cathodic) Quote Link to comment Share on other sites More sharing options...
Ferd/289 Posted April 18, 2007 Author Share Posted April 18, 2007 great info thanks Quote Link to comment Share on other sites More sharing options...
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