Why is corrosion sometimes worse under nuts and washersSolut

Why is corrosion sometimes worse under nuts and washers?

Solution

Some times corrosion under nuts and washers become worse because

1) There is no space for sufficient lubricant oil in nuts and washers

2) There is no sufficient air passage.

3) Nuts,bolts and wahers are fixed with a high strength.

4) These are affected by varying loads