C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
117/198, 117/95
C23C 22/82 (2006.01) B05D 3/10 (2006.01) B05D 7/14 (2006.01) B29C 63/06 (2006.01) B29C 63/48 (2006.01) C23C 22/24 (2006.01) C23C 22/78 (2006.01) C23C 22/83 (2006.01) F16L 58/10 (2006.01)
Patent
CA 1284443
20337-346 JACKETING STEEL OBJECTS ABSTRACT OF THE DISCLOSURE In a method for continuously jacketing steel objects particularly tubing including the steps of cleaning the object by means of blasting its surface; chromatizing the cleaned surface by exposing the surface to a silicate containing water solution of 3 and/or 6 valued chromium compound or compounds, drying the object at a temperature preferably between 105 degrees C and 130 degrees C which is well below the temperature necessary either for an application of a bonding and cover layer and/or for curing of the epoxy resin; a blend being applied prior to coversion of the chromatizing medium and any chromium iron compounds into a thermally stable intermediate layer including a chromium iron silicate oxide layer, the application of epoxy resin curing agent is carried out in two steps to obtain at least two sublayers, the first one of the layers being more reactive than the second one at temperatures below 170 degrees C and the two sublayers are cured together thereafter at a temperature between 170 to 240 degrees C, the first sublayer is applied in the liquidous state and the second layer is applied as a powder.
552084
Meyer Walter
Stucke Walter
Fetherstonhaugh & Co.
Mannesmann Aktiengesellschaft
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