EROSION: Results when a moving fluid (liquid or gas) flows across a metal surface, particularly when solid
particles are present in the fluid. Corrosion actually occurs on the surface of the metal, but the moving fluid washes
away the corrosion and exposes a new metal surface, which also corrodes.
FRETTING: Occurs as result of small, repetitive movements (e.g., vibration) between two surfaces in contact with
each other. It's usually identified by a black powder corrosion product or pits on the surface.
GALVANIC: Occurs when two different types of metal come in contact with each other, like steel bolts on
aluminum, for example. This is a common problem on aircraft because of their mix of metals.
STRESS: Term used to describe corrosion cracking and corrosion fatigue. Where an item is not ready/available
due to one of these forms of corrosion, it shall be recorded as a corrosion failure in the inspection record and the
appropriate code (170) for corrosion shall be used when requesting/performing maintenance.
SF Form 368, Product Quality Deficiency Report should be submitted to the address specified in DA PAM
750-8, The Army Maintenance Management System (TAMMS) Users Manual.
DESTRUCTION OF ARMY MATERIEL TO PREVENT ENEMY USE
For destruction of Army materiel to prevent enemy use, refer to TM 750-244-3.
PREPARATION FOR STORAGE AND SHIPMENT
Refer to Operator's Manual (TM 5-3805-296-10) for information on preparation for storage and shipment, and
preparation for transport.
The Military 621G Scraper is warranted for 12 months. The warranty starts on the date found in block 23 of DA
Form 2408-9, Equipment Control Record. Report all defects to your supervisor, who will take appropriate action.