Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1995-06-21
1996-03-05
Silverberg, Sam
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148285, C23C 810
Patent
active
054964172
ABSTRACT:
A conversion coating process for pretreating an aluminum or aluminum alloy surface in order to increase overlying coating adhesion and diminish corrosion and abrasion. The process involves delivering a flow of pure steam produced from deionized feedwater into a chamber. The flow of pure steam is directed against a baffle within the chamber causing the flow to diffuse. That is, the flow of steam is diverted from its initial direction of travel and caused to swirl. The surface of the aluminum or aluminum alloy metal is subjected to the swirling flow of pure steam so as to generate an oxide layer on the metal. The swirling pure steam subjects the resulting oxide layer to a pressure across its face which prevents the crystallization of the oxide layer in a defined and orderly pattern. The workpiece surface is preferably preheated to a threshold temperature prior to delivering the steam. In an alternate embodiment, the swirled flow of steam is circulated through the chamber and out of an exit port so as to maintain a non-static flow environment. The flow of steam exits the exit port and contacts the workpiece surface so as to generate the oxide layer. The process can be used as an intermediate step in a multi-step conversion coating process. The resulting aluminum-oxide film has superior work-environment performance and a high quality finish without any associated health or environmental risks. The process is designed to comply with U.S. military specification MIL-C-5541.
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Burrell Hugh B.
Farrugia Marvin A.
Electro-Steam Generator Co.
Silverberg Sam
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