Cleaning and liquid contact with solids – Processes – Using sequentially applied treating agents
Patent
1974-06-25
1977-01-11
Yudkoff, Norman
Cleaning and liquid contact with solids
Processes
Using sequentially applied treating agents
134 3, 134 15, 134 41, 148 37, 156651, 156664, C23G 102, C23G 108
Patent
active
040024890
ABSTRACT:
A method of pickling metallic material particularly for the continuous treatment of material in strip or wire form and especially such material consisting of stainless steel, wherein the material after annealing is subjected in a first step to the chemical attack of a first aqueous solution which is heated to a temperature above room temperature, preferably to between 55.degree. - 60.degree. C, and which contains HF in contents of from 7 to 25%, or which contains HF in the contents mentioned above and H.sub.2 SO.sub.4 over 2%, or which contains HF in the contents mentioned above the NaCl up to 10%, but especially from 0.5 to 2.5%; or which contains HF in the contents mentioned above and H.sub.2 SO.sub.4 in the contents mentioned above and NaCl in the contents mentioned above, and in a second step the material is subjected to the chemical attack of a second aqueous solution heated to a temperature above room temperature, preferably to between 55.degree. - 60.degree. C, and containing HF and HNO.sub.3.
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Lyman, Taylor; Metals Handbook, vol. 2, 8th ed. American Society for Metals, 1964, pp. 349-352.
Flodin Benny
Gunnarsson Einar
Hedqvist Tore
Lovercheck Dale
NYBY Bruk AB
Yudkoff Norman
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