Stanardized tests are common for corrosion.
A High Humidity and or a Salt fog chamber (5% salt fog is common)
So basicically time and type of chamber, evaluated to a specification, so much rust pits or what ever the spec indicates.
I would ASSUME that the bolts were submerged in salt water all at the same time to corrode the parts and them the product indicated (WD-40) was sprayed on and let sit for a specified amout of time and then a break away torque was applied and measured.
"WALLA" a number to throw out to argue about. LOL
OTAY?
Bubber