Galvanic corrosion in glycol solution
Galvanic corrosion in glycol solution
(OP)
I'm designing a thermoswitch adapter that will be used to control an electric fan in automobiles. The adapter mounts in a header tank, which can be steel, aluminum, or brass depending on model and vintage. The switches are always brass cased, and screw into the adapter.
The adapter is (or should be) immersed in a 50/50 antifreeze mix when the motor is hot, but can be exposed to air when the motor cools. At this point, my thinking is that brass would be the best material for the adapter, since it's important that the switch not corrode to the adapter. But if the tank is aluminum, would I be causing damage elsewhere? I can only choose aluminum or brass for the adapter.
The adapter is (or should be) immersed in a 50/50 antifreeze mix when the motor is hot, but can be exposed to air when the motor cools. At this point, my thinking is that brass would be the best material for the adapter, since it's important that the switch not corrode to the adapter. But if the tank is aluminum, would I be causing damage elsewhere? I can only choose aluminum or brass for the adapter.





RE: Galvanic corrosion in glycol solution
RE: Galvanic corrosion in glycol solution
RE: Galvanic corrosion in glycol solution
Source: http://downloads.pennnet.com/pnet/misc/sst/tuma.pd...
"The best attainable resistivities for DI water and DI/glycol are about 107 and 108 ohm-cm, respectively. The resistivity of DI/glycol fluids can degrade quickly if the deionizing bed is not
properly maintained or if the fluid is spilled. The dielectric constants of ethylene glycol and water are 38 and 78, respectively [13], at 25°C."
RE: Galvanic corrosion in glycol solution