Coating processes – Roller applicator utilized
Patent
1988-06-30
1990-06-19
Lawrence, Evan
Coating processes
Roller applicator utilized
420 12, 420 63, B05D 110
Patent
active
049352660
ABSTRACT:
A process for producing a corrosion-resistant protection on stabilizing wall surfaces and superheater tubes in sulfur-bearing hot gases which are used at surfaces temperatures of over 400.degree. C. in combustion installations, and a material in powder form which is suitable for that process, are intended to make it possible to use such wall surfaces and superheater tubes in sulfur-bearing hot gases in a good and durable fashion.
For that purpose, to form a protective layer which is preferably from 0.2 to 1.5 mm in thickness, a metal powder which is sprayed out of a molten state, of a given composition, with a surface area of more than 200 cm.sup.2 /g, is applied with an autogenous flame spray torch, with a quantitative gas flow rate of between about 1000 to 3000 NL/h, or 1500 to 2500 NL/h, for the combustion gas. The preferred composition of the metal powder used in Cr 15% to 35%, Mn 0.05% to 3%, Mo 0.05% to 5.0%, C 0.1% to 3%, Si 0.1% to 3%, Al 2% to 15%, with the balance Fe.
REFERENCES:
patent: 4019875 (1977-04-01), Dittrich et al.
patent: 4348433 (1982-09-01), Kammer et al.
patent: 4361604 (1982-11-01), Kushner et al.
Steine Hans-Theo
Wasserman Christopher
Castolin S.A.
Lawrence Evan
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