| 摘要 |
chemical cleaning of metal surface, more particularly removing scale and rust from welded seams of products from stainless steel and impacting decorative appearance to them. SUBSTANCE: paste comprises mixture of nitric acid with ammonium fluoride, binder and water. Binder includes dextrins prepared by thermolysis of starch, ratios of components being as follows, g/l: nitric acid (d= 1.4), 250-350; ammonium fluoride, 175-108; dextrin, 250-350; and water, 350-500. EFFECT: fewer components in paste composition, greater efficiency of suing reagents, increased labor safety, improved wettability and simplified removal of past form surface being treated. 2 cl, 2 ex |
