Pickling agent

Details Pickling agent Pickling agent

C - Chemistry, Metallurgy

23

G

253/1

C23G 5/00 (2006.01) C10M 103/00 (2006.01) C23G 1/14 (2006.01) C23G 1/28 (2006.01)

Patent

CA 1239139

PICKLING AGENT ABSTRACT OF THE DISCLOSURE An agent is disclosed for pickling, lubricating and as an antioxidant for workpieces made of iron or steel which are subjected to non-cutting, hot transformation. The agent contains (a) from 20 to 80 percent by weight of at least one pickling effective compound selected from Na2B4O7.10H2O, Na2B4O7.5H2O, anhydrous Na2B4O7, sodium metaborate, boric acid, boric acid anhydride, soluble sodium silicate with a SiO2/Na2O ration of from 2.5 to 3.3 and sodium metasilicate (anhydrous or having from 5 to 9 molecules of water of crystal- lization); (b) from 1 to 80 percent by weight of at least one dry lubricant selected from graphite, calcium fluoride, cryolite, antimony oxide, molybdenum disulfide, boron nitride, and the phosphates trisodium phosphate (hydrated or anhydrous), tripotassium phosphate (hydrated or anhydrous), sodium meta- phosphate [(NaPO3)3 or (NaPO3)4], potassium metaphosphate [(KPO3) or (KPO3)4], polymetaphosphate, sodium tripolyphos- phate (hydrated or anhydrous), sodium polyphosphate and zinc phosphate; and (c) from 0 to 79 percent by weight of at least one substance selected from group (d), group (e) and/or group (f) described below. From 0 to 35 percent by weight of group (d) can be used as substance (c). The substances of group (d) are additives which act as antioxidants and which in- fluence the formation of a layer in the workpiece, e.g., a bloom. Substance (c) can be at least one of the additives of group (d) selected from coke, powdery carbon, powdered cellulose, sawdust, starch, derivatives of starch, paraffin, a wax, a fatty acid, a fatty acid salt, colophonium, a derivative of colophonium, a synthetic resin based on hydrocarbons having 5 to 10 C atoms, a terpene resin and an indene-coumaron resin. From 0 to 50 percent by weight of group (e) can be used as substance (c). The substances of group (e) are substances which control the physical characteristics of the invention agent. Substance (c) can be at least one of the substances of group (e) selected from magnesium chloride (MgC12.6H2O), sodium chloride, potassium chloride, calcium chloride, sodium sulfate, sodium acetate, potassium acetate and a clay. From 0 to 5 percent by weight of group (f) can be used as substance (c). The substances of group (f) are substances which act in the reduction of the oxides of group (a) and in a separating manner. Substances (c) can be at least one of the substances of group (f) selected from ammonium chloride, urea, ammonium carbonate, a urea-formaldehyde resin and sodium carbonate.

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