METHOD OF REMOVAL OF SCALE, OXIDES, RUST FROM METAL SURFACES OF PARTS Russian patent published in 1997 - IPC

FIELD: chemical cleaning of metal surfaces, in particular, metal surfaces of parts in the process of fabrication of semiconductor devices, radio engineering articles, for instance metallized surfaces of printed-circuit boards for installation, service lines and power-generating plants of municipal utility. SUBSTANCE: the method consists in treatment of metal surfaces to be cleaned with an aqueous solution of sulfomaleic anhydride, whose concentration makes up 10 to 30 percent by mass, for 10 to 20 min at 50 to 80 C. EFFECT: facilitated procedure.