Carbon Composites bolted to Aluminum (The Head)
12-19-2003, 12:51 AM
#11
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Originally posted by ninegrand
Interesting info on the CF corrosion.
FWIW the top link you provided is for a heatshield that is fairly similar to the one offered by Nzaizar/Ricks. The mounting bracket is made of aluminum and bolts up to the aluminum head. The only CF to Aluminum contact is between the shield and the mounting bracket.
Not seeing a CF valve cover??
Interesting info on the CF corrosion.
FWIW the top link you provided is for a heatshield that is fairly similar to the one offered by Nzaizar/Ricks. The mounting bracket is made of aluminum and bolts up to the aluminum head. The only CF to Aluminum contact is between the shield and the mounting bracket.
Not seeing a CF valve cover??
As far as the heat shield, if there is a braket seperating it from the head, it should not be made of Al. Ti or Stianless Steel is better.
12-19-2003, 12:57 AM
#12
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Blitz,
What's your take on brass and aluminum? I have the Fumoto oil drain valve which is made of brass, but decided any migration would happen over a long time (at least longer than the life of the car) due to their proximity on the galvanic chart.
What's your take on brass and aluminum? I have the Fumoto oil drain valve which is made of brass, but decided any migration would happen over a long time (at least longer than the life of the car) due to their proximity on the galvanic chart.
12-19-2003, 10:21 AM
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MacGyver,
As far as corrosion goes a Brass plug bolted to an Steel Oil Pan (if its Steel, didn't check), the plug is protected against corrosion by the steel!!!
Yes, the steel will corrode prefencially, but the area of the oil pan is much greater then the plug. So the Steel corrosion will neglegable. Your oil pan will be okay.
Brass usually fails due to dezincification, pitting, or stress corrosion cracking. The oil plug experiences very low or none of these conditions. The Brass Plug will be okay.
As far as corrosion goes a Brass plug bolted to an Steel Oil Pan (if its Steel, didn't check), the plug is protected against corrosion by the steel!!!
Yes, the steel will corrode prefencially, but the area of the oil pan is much greater then the plug. So the Steel corrosion will neglegable. Your oil pan will be okay.
Brass usually fails due to dezincification, pitting, or stress corrosion cracking. The oil plug experiences very low or none of these conditions. The Brass Plug will be okay.
12-19-2003, 10:24 AM
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[QUOTE]Originally posted by BlitzSRM
MacGyver,
As far as corrosion goes a Brass plug bolted to an Steel Oil Pan (if its Steel, didn't check), the plug is protected against corrosion by the steel!!!
MacGyver,
As far as corrosion goes a Brass plug bolted to an Steel Oil Pan (if its Steel, didn't check), the plug is protected against corrosion by the steel!!!
12-19-2003, 11:58 AM
#15
If you are installing a Fumoto valve, you are probably using a gasket washer, and not the crush washer used with the stock drain plug. The gasket washer acts as an insulator, preventing galvanic corrosion from the atmosphere. The threads are immersed in oil, but this will not cause a galvanic corrosion problem.
If you are using the stock crush washer, any galvanic corrosion will attack the zinc plating on the washer. But remember that the engine is warm when you are driving, not allowing any aqueous chloride solution to do its damage. You'd have to literally be immersed in a very salty puddle to get the salt to do any damage even to the crush washer.
Interesting info on Graphite/Aluminum galvanic corrosion, Blitz. I didn't know there was a problem with any non-metallic material, although it does make sense since graphite is highly conductive. As a metallurgist, I've been involved with galvanic corrosion issues relating to design, and graphite was never mentioned.
If you are using the stock crush washer, any galvanic corrosion will attack the zinc plating on the washer. But remember that the engine is warm when you are driving, not allowing any aqueous chloride solution to do its damage. You'd have to literally be immersed in a very salty puddle to get the salt to do any damage even to the crush washer.
Interesting info on Graphite/Aluminum galvanic corrosion, Blitz. I didn't know there was a problem with any non-metallic material, although it does make sense since graphite is highly conductive. As a metallurgist, I've been involved with galvanic corrosion issues relating to design, and graphite was never mentioned.
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