Coating processes – With pretreatment of the base – Metal base
Patent
1998-01-26
1999-09-14
Dudash, Diana
Coating processes
With pretreatment of the base
Metal base
148247, 427305, 427309, 427328, 427353, 4273722, 4273884, 427405, 427409, 4274192, 427436, 427470, B05D 138, B05D 716, C23C 2248
Patent
active
059520493
ABSTRACT:
Processes for producing improved environmental protection, corrosion resistance and improved paint adhesion for metals; e.g., ferrous, aluminum, or magnesium alloys; and other surfaces upon contact is disclosed. The processes comprise use of one or more Group IV-A metals such as zirconium in an acidic solution with one or more oxyanions or other non-fluoanions to stabilize and solubilize the metal while fluorides are specifically excluded from the processes and compositions. The processes optionally contain pretreatment stages that serve to activate a surface and/or promote formation of a Group IV-A metal oxide matrices through use of an oxygen donor. The compositions are at a pH below about 5.0 and is preferably in a range between about 1.0 and about 4.0. The coatings may contain surfactants, sequestering agents, or organic additives for improved corrosion protection and paint adhesion. The substrate may be treated by immersion, spray, fogging or rollcoat.
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Dudash Diana
Natural Coating Systems, LLC
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