The washer of 1976 actually went under 2 feet of salt water in Katrina in 2005 too. My dad bought the 1976 washer brand new, its front bearing gone noisy about 1999, it went until the summer of 2005 before the cage broke in the bearing. I was rebuilding it before Katrina. There is some rust on the bottom frame where salt sat for a few weeks. There is a small 1/4" hole that in the back tub below the bearing housing that got filled with goop and painted with rust bullet.
The only other washer my folks had was the 1947 Westinghouse, that got scrapped in 1976. As far as rust there seems to be really no difference in the build quality.
The basket on the 1976 machine is now out to replace the worn shaft. The machine was rebuilt in 2006 and just taken apart last month.
The 1976 Westinghouse dryer went under 2 feet of salt water too, only thing I did was remove the AC motor and washing it in a bath tub and relubed the bearings. The front dryer vent's "screen" one sees when one opens the door rusted out after Katrina. A new one was a few bucks off of Ebay. All I did with the dryer is wiped the insides and outsides with windex and towels. The heater element broke a few years after katrina, a new old stock one was 20 bucks from ebay. The element broke were a replacement standoff is added in the repair kit.
As far as functional rust on the 1976 washer; the rebuild of 2006 had me doing a repair to the lower part of the "tub front" piece with some marine epoxy. This still looks good after 4 years of usage, but I scored a new tub front from a Hunstsville repair place as a spare.
The aluminum trim on the 1976 has the typical aluminum pock marks due to living right by the water, and the house being flooded.
The 4 steel adjustment feet got rusted alot after Katrina; I just got new ones. The washer was apart when the house flooded, the spin basket, two pulleys and AC motor went under water too. I had a brand new motor I used in the 2006 rebuild, the old motor still works but why chance it.
About the worst concern with my 1976 westinghouse is the back tub right below the bearings small hole. I am going to grind of the patch of 2006 and re do it and use POR15 and exoxy paint.
In my house that got 2 feet of water, the 1990? dishwasher works, its solenoid was stuck. The wtser heater in the garage had to have its jet cleaned, it did this a few days after the storm. It is from 1990 thus the salt probably has me on borrowed time.
The 6" micrometer in this video has a rust stain since it went under salt water too!