| 摘要 |
This invention is related to a process for pickling metals, especially rust resistant steel materials, preferably for removing mill scale and other oxide layers, which is characterized in that the metal is brought into contact with a pickling agent comprising, in aqueous solution, in per cent by weight: H2SO4 5-35, H3PO4 5-35, fluoride ion (HF) at least 0.1, Fe<3+> at least 0.4, optionally other in pickling agents commonly used additives, such as surface active agents H2O up to the rest (up to 100 %) and additionally optionally thickening agents and fillers. The invention is also related to a pickling agent for said process and a concentrate for preparing said pickling agent. |
