TM-1-1500-344-23-2
AIRCRAFT VOLUME II
TECHNICAL MANUAL; CLEANING AND CORROSION CONTROL
APRIL 2009
TM-1-1500-344-23-2 - Page 86 of 240
4-10
NAVAIR 01-1A-509-2
TM 1-1500-344-23-2
15 April 2009
Table 4-1. Recommended Non-Powered Abrasives for Corrosion Removal
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Fine) grades. Use of aluminum oxide is prohibited on
composite surfaces. Silicon carbide is usually more
effective than aluminum oxide on harder metals such as
ferrous alloys. Other abrasives are available on paper
or cloth (emery and flint) but suffer from poor efficiency
and short working life.
4-9.1.4. Metallic Wools. Metallic wool is an abrasive
material used for removing corrosion that is not tightly
bonded to a metal surface. The four major types of
metallic wools are: aluminum, copper, stainless steel,
and steel. Metallic wools are available in five grades,
ranging from very fine to extra coarse. Table 4-3 is a
guide to help select the correct grade of metallic wool.
These materials are very good for corrosion removal on
tubing or extruded parts.
CAUTION
The use of metallic wools which are not
galvanically compatible with the metal surface
being treated is not authorized.
a. The type of corroded metal must be known before
using metallic wool. Steel wool is used on ferrous
metals; aluminum wool is used on aluminum, aluminum
alloys, magnesium, and magnesium alloys; copper
wool is used on copper alloys, bronze, and brass; and,
stainless steel wool is used on stainless steel.
b. After using metallic wools, remove all residue
from the metal surface with a vacuum cleaner.
4-9.1.5. Wire Brushes. Wire brushes are used to
remove heavy corrosion deposits or paint that is not
tightly bonded to the metal surface. They are available
with aluminum, steel, stainless steel, or brass bristles.
Thick, short, and/or stiff bristles are more effective for
rapid corrosion removal. The brushes must be
compatible with the metal surface to prevent galvanic
corrosion. Stainless steel can be considered to be
neutral, and can be used on all aviation equipment. Do
not use a wire gage or diameter above 0.010 inch, as
gouging of the surface may occur. Remove the corrosion
with a linear motion; do not cross-hatch. This will
unnecessarily damage the surface. After wire brushing
soft metal (such as aluminum or magnesium) the surface
areas must be polished with fine abrasive paper.
4-9.1.6. Pumice Powder. Pumice powder is a very fine
and soft abrasive used to remove stains or to remove
corrosion on thin metal surfaces where minimum metal
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