Removal of Ferrous Sulfide Deposits

1,151,649. Cleaning ferrous surfaces. DOW CHEMICAL CO. Oct. 17, 1967, No. 47177/67. Heading C7E. Ferrous sulphide is removed from ferrous surfaces by treating with an aqueous solution containing 1-10% by weight of HCl and/or H 2 SO 4 , 0À1-1% by weight of copper ion, and at least one thiourea compou...

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Bibliographische Detailangaben
1. Verfasser:	FRED NORMAN TEUMAC
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY
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Zusammenfassung:	1,151,649. Cleaning ferrous surfaces. DOW CHEMICAL CO. Oct. 17, 1967, No. 47177/67. Heading C7E. Ferrous sulphide is removed from ferrous surfaces by treating with an aqueous solution containing 1-10% by weight of HCl and/or H 2 SO 4 , 0À1-1% by weight of copper ion, and at least one thiourea compound selected from thiourea, 1, 3 dimethyl thiourea, 1, 3 diethyl thiourea, alkyl thiourea, ethylene thiourea, 1, 3 diisopropyl thiourea, the thiorea compound being present in an amount equivalent to an amount of thiourea from 2-20 times the weight of copper ion. Suitable copper salts for providing the copper ions are copper sulphate, cupric nitrate, cupric acetate and cupric chloride. Treatment is effected at ambient temperatures and preferably at pressures above atmospheric.