From my related question, I want to know about sea spray being ingested into a piston engine during flight. Will this immediately corrode the engine unless there are special materials?
I'm asking this for piston engines, not jets or turboprops. I'm especially interested in WW2-era planes.
Obviously this is primarily about naval aircraft built for saltwater environments, but I'd like to know the protection measures so I can see if a land-based aircraft can be easily modified, or if it's going to need an entirely new engine.
Note: At very high temperatures, corrosion is much faster. I don't know the math for corrosion, but my worry is that sea spray in the engine could cause some cracks somewhere after just a few flights, unless things are made from a much higher (more expensive) grade of stainless steel or aluminum alloy.