Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
  • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
  • C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
  • C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
  • C23G1/065—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors sulfur-containing compounds

Definitions

• the present invention relates to an improvement in the art of pickling iron, especially malleable iron, steel, iron alloys and articles therefrom, as wires, wire ropes, sheets, etc. It comprises the new pickling liquors, the process of making same, the application thereof, as well as the metal treated with the new pickling liquors.
• This invention is based on the observation that quite generally the products soluble in dilute mineral acids which are obtained by condensing aldehydes keiongsand suitable acid 'clil'orides such. as phosgene, w itlijalromaticjamiiid-comnounds glijromati q nitrocompounds and subsequent reduction arefiemarkably suitable additions to acid liquids for treating metals. They are particularly suitable as additions to pickling baths, liquid soldering fluxes or the like, which serve for removing from metals impurities, such as rust, scale or the like.
• These products comprise quite generally compounds containing at least two aryl nuceli which themselves contain an NH -group or a substituted NH -group and which are bound by a so-called central carbon atom.
• This central carbon atom itself may be bound with hydrogen, oxygen, alkyl or aryl residues.
• aminodinaplithylnieflfifiieoft e corresponding symmetrical and unsymmetrical primary or secondary N-substitution products, for example fl kfistatharnethyldiaminodiphenylmethane ;,further the corresponding products which may be obtained with acetaldehyde or acetone instead of with formaldehyde; as well as ketones, such as 4:4L-tet ramethyldiaminobenzophenone, also the triaifiifiotriphenylmethane or, quite generalTi,theleii'cocompounds of the triarylmethane dyestuifs containing amino-groups, such as l eucocr stalliolet or leuco malachite green, or'tlie corresponding quaternary ammonium bases of all these.
• the above mentioned compounds may be used not only alone or in mixture with each.
• Example 1 1000 parts of hydrochloric acid of 15 per cent. strength are mixed with 0.2 part of the hydrochloride of 4:4-tetramethyldiaminodiphenylmethane or with 0.1 part of the hydrochloride of 4:4'- or 2:2'-tetramethyldiaminodinaphthylmethane.
• the solution may c will i 1,778,634 p i I ent for treating 3.
• Sheet iron is immersed until it has been 5.
• V sheets are then removed and are ready for further treatment (ti ning, zincing, varnishing, soldering or the like). If for any reason the iron is not immediately removed rom the pickling liquor there is no appreciable 1c; further action of the acid and in consequence f practically no dissolution of the metal, such as is known to occur in a pickling bath of the ordinary kind.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
• Detergent Compositions (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=4495074

Family Applications (1)

Country Status (4)

Cited By (1)

• 0
  • BE BE361181D patent/BE361181A/xx unknown
• 1929
  • 1929-06-03 FR FR676096D patent/FR676096A/fr not_active Expired
  • 1929-06-04 US US368426A patent/US1778634A/en not_active Expired - Lifetime
  • 1929-06-07 GB GB17551/29A patent/GB313135A/en not_active Expired

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