Fault Phenomenon: Zoomlion marine crane in a marine environment, the paint on structural parts bubbles and peels extensively, rusting.

Troubleshooting Process:
– Checked coating process: primer not fully dried before topcoat application.
– Checked salt spray corrosion: salt penetration.
– Thoroughly derusted, re-applied heavy-duty anti-corrosion coating.

Root Cause: The coating application quality was substandard, failing to meet anti-corrosion standards for the marine environment.

Required Parts: Anti-corrosion paint, derusting materials.