PROCESS OF ETCHING OF THIN-SHEET STEEL IN STACKS Russian patent published in 2003 - IPC

FIELD: etching of sheet steel, metal finishing. SUBSTANCE: during process of carbon steel etching with thickness under 4.0 mm bars-spacers which length equals 0.80-0.85 width of sheet are positioned in advance between sheets with formation of clearance between sheets over entire their surfaces within limits of 3-4 thicknesses of sheet. While stack is stood up-edge for installation in cassette stack bottom is freed from contact with lifting chains and installed in cassette, after this etching is started in 22-26% solution of sulfuric acid containing inhibitor and under 9% of iron sulfate. Metal is washed after etching in the course of time inversely proportional to duration of etching. EFFECT: expanded technological potential of process of etching of thin-sheet steel in stacks without any deterioration of sheet steel and profitability of process.