Metal treatment – Compositions – Heat treating
Patent
1987-11-18
1988-11-22
Silverberg, Sam
Metal treatment
Compositions
Heat treating
138146, 138143, B05D 136, C23C 2224
Patent
active
047863390
ABSTRACT:
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 watery 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 conversion 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 layer being more reactive than the second one at temperature 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.
REFERENCES:
patent: 4548868 (1985-10-01), Yinezawa
Meyer Walter
Stucke Walter
Mannesmann AG
Siegemund Ralf H.
Silverberg Sam
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