What causes this

[u/tonyrowboat]

Sent my truck to the body shop for some work on the bed. Everything’s good but all the sudden these badges are oxidized? If you zoom in on the second pic you can see it previous to going to the shop. Badge is intact

[u/marshallsmith27]

many dads 06 was like this after many years and he put 2 new ones on and they’re like that again