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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

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