Coating processes – Spray coating utilizing flame or plasma heat – Metal or metal alloy coating
Patent
1996-07-11
1997-11-25
Bareford, Katherine A.
Coating processes
Spray coating utilizing flame or plasma heat
Metal or metal alloy coating
427456, 427236, 427328, 427292, C23C 402, C23C 406
Patent
active
056910045
ABSTRACT:
A method of treating a light metal cylinder bore wall to adherently receive a thermally sprayed metallic coating, that comprises (a) honing the wall to produce a net cylinder shape surface by use of spiral overlapping cross-abrasions having certain peaks and valleys of the abrasions folded over and molded to create tears, folds and undercuts rendering a hook and ladder effect, the honing being carried out with the use of a machining coolant to prevent burnishing of the walls; (b) either concurrently or shortly after step (a), washing the honed surface with a hot alkaline solution comprising (i) a non-soaping aluminate forming agent (sodium xanthate) that produces a residue on the walls, and (ii) surfactants that facilitate wetting of the walls even when some steam bubbles may be present; (c) rinsing the washed surfaces without disturbing the residue; and (d) thermally spraying a metallic bond coat and top coat on the honed and washed surface to render adhesion between the coating and prepared surface that is at least 6000 psi.
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Nageswar Rao V. Durga
Palazzolo Christopher K.
Shepley Barry E.
Bareford Katherine A.
Ford Global Technologies Inc.
Malleck Joseph W.
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