| 摘要 |
<p>A C layer is removed from a solid surface, pref. a metal or ceramic, by (a) contacting with a gaseous fluid contg. SO3; pref. under anhydrous conditions; (b) rinsing, pref. with water; and (c) pref. contacting the surface with a passivating soln., esp. contg. a chelating agent. Alternatively, rinsing may be by contacting with a passivating soln. The gaseous fluid is pref. gaseous SO3, or is nonreactive with SO3. - The process effectively removes C, e.g. formed on steel plates by lubricant residue, avoiding interference with subsequent processing. Most of the C may be removed in a few seconds contact. Metal surfaces may be left activated, and corrosion is avoided by passivating. EPAB- EP-108819 B A process for removing a carbon layer from a solid surface having such layer thereon, characterised by contacting the surface with an anhydrous fluid consisting of sulfur trioxide vapour or of a mixture thereof with dry air, nitrogen or a chlorinated solvent or a fluorinated hydrocarbon and thereafter rinsing the surface. - (7pp)</p> |
