| 摘要 |
This etching agent for iron and steel materials is an acidic aqueous solution containing ferrous ions, ferric ions, and a water-soluble compound containing acetylene groups. When the concentration of ferrous ions in the etching agent is A wt% and the concentration of ferric ions is B wt%, the A/B value is preferably 0.1 to 2.5. This replenishing liquid is a replenishing liquid that is added to the etching agent when the etching agent is continuously or repeatedly used, and is an aqueous solution containing a water-soluble compound containing acetylene groups. |
