Corrosion resistance
Corrosion resistance
(OP)
I have two choices for some shafts that some linear bearings will run along. The parts will be immersed in a saline solution at 98 deg F for 14 days. I have both 440C and 17-4 hardened shafts readily available. Any guesses on whether either I should expect corrosion of either stainless steel alloy. If so, is one material more prone to corrosion than the other in this environment.
I quickly perused a bunch of galvanic series charts, but didn't find any listing 440C and 17-4 stainless in comparison to one another.
I quickly perused a bunch of galvanic series charts, but didn't find any listing 440C and 17-4 stainless in comparison to one another.





RE: Corrosion resistance
RE: Corrosion resistance
What are the bearings?
They may be what corrodes the worst.
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Plymouth Tube
RE: Corrosion resistance
RE: Corrosion resistance
RE: Corrosion resistance
Even though 17/4 is, Aqualoy 17 or Aquamet 17, is a common boat shafting material it is normally used used on very active vessels, it doesn't like stagnant conditions. For intermittent operation in salt water Aqualoy 22 or Aquamet 22 is a far better choice.
If you use boat shafting it is ready to go, already finished and straightened.
Aqualoy 22 or Aqualoy 22 High Strength
Click on the shafting data brochure.
http://www.aqualoy.com/
Aquamet 22 or Aquamet 22 or Aquamet 22 High Strength
http://www.aquamet.com/aquamet22.nxg