Maybe it's not a corrosion thing but rather wear. Back in the late Eighties the DH Dash 8-100 series had a heap of main gear gear collapses.
In July 1995 a Dash 8-100 operated by Ansett NZ had a CFIT, but what was behind the crash was that the crew were distracted by failure of main gear to deploy from the well.
Turns out the RH uplock latch was worn beyond tolerance and the type was intolerant of wear.