Reference

Use of thiourea derivatives for corrosion protection of carbon steels during chemical cleaning of boiler units

Use of thiourea derivatives for corrosion protection of carbon steels during chemical cleaning of boiler units. Shadrina, N. I.; Glikina, F. B.; Bychkova, N. A.; Vinogradov, Yu. A.; Kutikov, A. R. (Mosk. Gos. Pedagog. Inst., Moscow, USSR). Elektr. Stn., (1), 29-31 (Russian) 1978. CODEN: EKSTAP. ISSN: 0013-5372. DOCUMENT TYPE: Journal CA Section: 55 (Ferrous Metals and Alloys) The thiourea derivs. in a mixt. with surfactants or N-contg. acid-pickling inhibitors were useful in protecting boiler steel 20 [12725-36-9] from corrosion during cleaning with Trilon B [64-02-8] and different acids at 100-30°. The protective action of the inhibitors remained high with the mixt. circulation and the presence of 1 g Fe3+/kg and 0.3 g Cu2+/kg in the solns. The protection of the steel from corrosion during boiler cleaning with Trilon B with org. acids at ￡170° was achieved by adding inhibiting compns. contg. thiourea derivs. phenylthiourea [103-85-5], diphenylthiourea [102-08-9], o-tolylthiourea [614-78-8], and di-o-tolylthiourea [137-97-3] and acid-pickling inhibitors.

Pickling solution for steel wire

Pickling solution for steel wire. (Daikin Kogyo Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 59089779 A2 24 May 1984 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C23G001-06. APPLICATION: JP 82-199490 13 Nov 1982. DOCUMENT TYPE: Patent CA Section: 55 (Ferrous Metals and Alloys) A pickling soln. contains a mineral acid and/or org. acid, a surface-active agent contg. F, and a corrosion inhibitor. The soln. has an extended life. Thus, an aq. pickling soln. contg. HCl, quinoline [91-22-5], and o-tolylthiourea [614-78-8] and C9F19CH2CH2O(C2H4O)10H [92071-85-7] was used in pickling steel wires, and the soln. showed decreased consumption of HCl.