primer color for USMC Huey 1-N

Yes, the primer color is zinc chromate yellow.  As Hawkeye noted, they do chip a bit, but it is quickly touched up to prevent corrosion.

There was some chipping...anytime you introduce moving metal parts into and environment that produces flying debris.

These aircraft depending on service area faded and oxidized a lot. Any bare metal would be quickly treated (spray can) to prevent corrosion.