TO 1-1-700 - Robins Air Force Base
TO 1-1-700 - Robins Air Force Base
TO 1-1-700 - Robins Air Force Base
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<strong>TO</strong> 1-1-<strong>700</strong><br />
Table 8-8. Preservative Compounds for Electronic Equipment - Continued<br />
Description Characteristics Application Restriction<br />
Corrosion preventive<br />
compound MIL-DTL-<br />
85054 (Non-ODS type)<br />
Temporary repair of paint<br />
damage to exterior surfaces<br />
such as cracks and<br />
scratches preservative for<br />
non-moving metal parts<br />
not requiring a lubricated<br />
surface.<br />
Apply by brush or spraying<br />
an even thin film to<br />
surface.<br />
Do not use on interior surfaces of<br />
electronic equipment, electrical connectors,<br />
coaxial connectors, or receptacles.<br />
Do not use around oxygen, oxygen<br />
fittings, or oxygen regulators, since<br />
fire or explosion may result.<br />
8.7 CORROSION REMOVAL.<br />
This paragraph outlines the materials, equipment, and techniques<br />
involved in corrosion control. It is important that personnel<br />
analyze the problem and select the correct corrosion<br />
removal and preservation materials. In addition, each case<br />
should be followed up where possible to see if the corrosion<br />
has been arrested. It is also extremely important that personnel<br />
correctly identify the material substrate of each component in<br />
question.<br />
8.7.1 Materials. Whenever corrosion is detected, corrective<br />
action is required. If the corrosion is within repair limits as<br />
established by equipment system specific technical manuals,<br />
corrective action shall be taken. This action shall consist of<br />
cleaning, corrosion removal and treatment, and preservation as<br />
required. In all cases, the mildest effective methods shall be<br />
used for cleaning and corrosion removal. The following methods<br />
are approved for use on C-E-M equipment:<br />
8.7.1.1 Hand Rubbing/Abrasion. The nature of some surfaces<br />
such as chrome, nickel, gold and silver plated contacts,<br />
cadmium and tin plated connectors and accessories, limit the<br />
use of highly abrasive methods. Tarnish and light corrosion<br />
can be removed from such surfaces by rubbing with<br />
• an eraser;<br />
• A-A-3077 and/or A-A-2074 Brushes;<br />
• non-abrasive pad;<br />
• A-A-58054, Abrasive Mat; or<br />
• ANSI-B74.18, Abrasive Cloth.<br />
8.7.1.2 Portable Mini-Abrasive Unit. The portable miniabrasive<br />
unit is a hand-held miniature abrasive tool used to<br />
remove light corrosion products from small electronic components.<br />
For example, printed circuit board (PCB) edge connector<br />
pins, small structural components. This abrasive unit<br />
should not be used on plated surfaces.<br />
8.7.1.2.1 AWWA-B504, Monobasic Sodium Phosphate, is<br />
the specified abrasive material for use in the mini-abrasive<br />
unit.<br />
8.7.1.2.2 The portable mini-abrasive unit shall be operated<br />
only in a blast cleaning cabinet. The monobasic sodium phosphate<br />
abrasive may contaminate other equipment and components<br />
if allowed to blow freely into the surrounding shop.<br />
8.7.1.3 Hand-Held Abrasive Tool. This unit is used with a<br />
blast cleaning cabinet to remove corrosion products from electronic<br />
equipment structures and housings.<br />
8.7.1.3.1 SAE-AMS-2431/6 Glass Beads are the required/<br />
allowed abrasive material for use in the hand-held abrasive<br />
tool.<br />
8.7.1.3.2 The hand-held abrasive tool shall be operated only<br />
in a blast cleaning cabinet. The glass beads may contaminate<br />
other equipment and components if allowed to blow freely<br />
into the surrounding shop.<br />
8.7.1.4 Chemical Paint Removers. Paint removers specified<br />
in Chapter 2 of <strong>TO</strong> 1-1-8 shall be used to chemically<br />
remove paint and may be applied by brush. When used, care<br />
should be exercised in handling to avoid contact with the skin.<br />
The directions on the container and procedures in Chapter 2 of<br />
<strong>TO</strong> 1-1-8 shall be followed to ensure safe handling and best<br />
results. Whenever a chemical paint remover has been used, the<br />
surface should be thoroughly washed with fresh water and<br />
detergent prior to any paint application.<br />
8.8 SURFACE TREATMENT.<br />
Proper surface treatment is essential to preventing corrosion<br />
from returning after it has been removed.<br />
8.8.1 Chemical Conversion Coatings. Chemical conversion<br />
coatings are aqueous acid solutions of active inorganic<br />
compounds which combine with aluminum or magnesium surfaces<br />
to form a corrosion resistant film. In addition, they also<br />
improve the adhesion of paints or primers. Guidance regarding<br />
the use of chemical conversion coatings can be found in Chapter<br />
7 of this manual.<br />
Change 2 8-33