TM 1-1520-238-23
Change 9
1-158.9
1.49.
CORROSION CONTROL/INSPECTION – continued
1.49.13. Initial Cleaning and Inspection
a. Clean suspected area thoroughly using a clean cloth (item 54, App F) dampened with dry cleaning solvent
(item 74, App F).
b. Inspect area using a 10X magnifying glass and flashlight.
(1) Examine edges of skin panels, rivet heads, and corrosion-prone areas. If there are blisters, bubbles, or
other coating irregularities present, attempt to dislodge the paint by carefully scraping using a sharp, plastic tool.
(2) When corrosion is suspected, but no irregularities are present, apply a strip of masking tape (item 206,
App F) over the suspected area and remove the tape with an abrupt lifting motion.
(3) Where paint is removed, inspect and determine extent of corrosion.
1.49.14. Degrees of Corrosion
a. Light corrosion
(1) Where the condition of the metal is characterized by discoloration and pitting to a depth of 0.001 INCH (1
mil). This type of damage can normally be removed by light hand sanding.
b. Moderate corrosion
(1) Where the condition of the metal is characterized by blisters, evidence of scaling, of the coating or paint
system, intergranular corrosion, and pitting to a depth of 0.001 INCH (1 mil) to 0.010 INCH (10 mils). This
type of damage shall be removed by extensive hand sanding, light mechanical sanding, or by deoxidizing
with a corrosion removing compound (item 64B, App F).
c. Severe corrosion
(1) Where the condition of the metal is characterized by blistering, evidence of scaling, flaking of the coating
or paint system, intergranular corrosion, and pitting to a depth greater than 0.010 INCH (10 mills). This type
of damage shall be removed by extensive mechanical sanding, grinding, or by deoxidizing with a corrosion
removing compound (item 64B, App F).
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