TO 35-1-3 - Robins Air Force Base
TO 35-1-3 - Robins Air Force Base
TO 35-1-3 - Robins Air Force Base
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<strong>TO</strong> <strong>35</strong>-1-3<br />
spray. The equipment recommended should be for high, field<br />
and depot level production levels. Organizations may use the<br />
Thermion 500 and the Thermion Bridgemaster or equivalent<br />
systems for metalizing operations. Thermion equipment may<br />
be procured from Thermion Metalizing System, Ltd., P.O. Box<br />
2136, Silverdale, WA 98383-2136. Table 3-3 lists currently<br />
authorized metalization materials and preferred sources of<br />
supply.<br />
Table 3-3. Metalization Material Sources of Supply<br />
Material Use Source of Supply<br />
85/15% zinc/aluminum alloy Best overall general purpose corrosion<br />
protection on abrasive blasted carbon<br />
steel surfaces.<br />
100% aluminum For coating hot sections of equipment,<br />
mufflers, and aluminum equipment.<br />
The Platt Brothers & Company<br />
P.O. Box 1030<br />
Waterbury, CT 06271<br />
AUFHAUSER Corporation<br />
39 West Mall<br />
Plainview, NY 11803<br />
Alcotec Wire Corporation<br />
2760 Aero Park Dr.<br />
Traverse City, MI 49686<br />
AUFHAUSER Corporation<br />
39 West Mall<br />
Plainview, NY 11803<br />
90/10% aluminum/aluminum oxide<br />
alloy<br />
For the application of a tough durable,<br />
long-term anti-slip coating to steel and<br />
aluminum surfaces.<br />
Alcotec Wire Corporation<br />
2760 Aero Park Dr.<br />
Traverse City, MI 49686<br />
AUFHAUSER Corporation<br />
39 West Mall<br />
Plainview, NY 11803<br />
100% zinc Excellent corrosion protection except in<br />
seawater immersion conditions.<br />
The Platt Brothers & Company<br />
P.O. Box 1030<br />
Waterbury, CT 06271<br />
AUFHAUSER Corporation<br />
39 West Mall<br />
Plainview, NY 11803<br />
3.16.5.1 Metalization Process Metal Wire Arc Spray<br />
(MWAS). MWAS is a thermally sprayed, sacrificial metalized<br />
coating for effective protection of structural iron and steel in<br />
corrosive environments. For ferrous metal surfaces, other than<br />
stainless/corrosion resistant steel, 85/15% zinc/aluminum<br />
alloy wire has shown the widest application and corrosion<br />
protection latitude. 85/15% zinc alloy, 1/8-inch diameter is the<br />
common wire diameter. Organizations may use this alloy for<br />
all application on properly prepared ferrous metals over 1/8-<br />
inch thick, except stainless/corrosion resistant steel alloys. For<br />
aluminum equipment or ferrous metal used in a high temperature<br />
zones use METCO Aluminum wire or equivalent, 99.0%<br />
purity, 1/8-inch diameter.<br />
3.16.5.1.1 In the MWAS process, two electrically isolated<br />
wires of the selected coating material are given opposite DC<br />
polarity using an arc-welder power supply. The wires are<br />
simultaneously fed to an application gun where they are<br />
brought into close proximity to initiate an electric arc. The arc<br />
between the two impinging wires results in a local region of<br />
high temperature plasma and molten metal. A jet of compressed<br />
air, directed through the arc region from behind, disperses<br />
and projects the molten metal to the surface being<br />
coated. The metal droplets impinge on the substrate; solidify<br />
and bond to form a continuous barrier/sacrificial metal coating<br />
for cathodic protection of the metal structure. The application<br />
gun remains 8-12 inches from the metal surface and negligible<br />
heat is imparted to the substrate even during extended coating<br />
activities.<br />
NOTE<br />
The air supply must be sufficiently free of oil and<br />
moisture so that no visible oil or moisture appears on<br />
the blasted surface.<br />
3.16.5.1.2 All surfaces to be thermal sprayed shall be abrasive<br />
blasted to a minimum of a near-white metal blasted surface<br />
and roughened to a minimum of a 2 mil surface profile. If<br />
paint, oil or bituminous materials are present they must be<br />
3-14