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GB750966A - Improvements in or relating to the preparation of chromic compounds - Google Patents

Improvements in or relating to the preparation of chromic compounds

Info

Publication number
GB750966A
GB750966A GB12208/54A GB1220854A GB750966A GB 750966 A GB750966 A GB 750966A GB 12208/54 A GB12208/54 A GB 12208/54A GB 1220854 A GB1220854 A GB 1220854A GB 750966 A GB750966 A GB 750966A
Authority
GB
United Kingdom
Prior art keywords
bisulphite
ammonium
alkali metal
sulphite
sodium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB12208/54A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoyt Metal Co Ltd
Original Assignee
Hoyt Metal Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoyt Metal Co Ltd filed Critical Hoyt Metal Co Ltd
Publication of GB750966A publication Critical patent/GB750966A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/163—Phosphorous acid; Salts thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/37—Phosphates of heavy metals
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G37/00—Compounds of chromium
    • C01G37/14—Chromates; Bichromates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
    • C09D5/084—Inorganic compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Paints Or Removers (AREA)

Abstract

Chromic orthophosphate (suitable for use in wash primers or metal conditioners and having corrosion resistant properties), orthophosphite and orthoarsenate are prepared by adding an alkali metal or ammonium sulphite and an alkali metal or ammonium bisulphite to a mixture containing an alkali metal or ammonium bichromate and phosphoric, phosphorous or arsenic acid respectively, while maintaining a pH of 1.0-4.5 Stoichio-metric proportions for the reaction: Na2Cr2O7.2H20 + 2H3PO4 + Na2SO4 + 2NaHSO3 + 6H20 --> 2(CrPO4.6H2D) + 3Na2SO4, (or the corresponding reactions involving phosphorous or arsenic acids) are preferred. The initial mixtures of bichromate/acid and sulphite/bisulphite may have pH's of about 1 and 6.2 respectively, and the mixing of these solutions should take place slowly with agitation. Suitable sulphite/bisulphite solutions may be obtained by adding 1 mol of sodium hydroxide (or equivalent sodium carbonate) to 3 mols of sodium bisulphite: alkali metal or ammonium may alternatiively replace sodium. The chromic orthophosphate is in the form of very fine (e.g. 7m ) dark green amorphous particles.
GB12208/54A 1953-04-29 1954-04-27 Improvements in or relating to the preparation of chromic compounds Expired GB750966A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US750966XA 1953-04-29 1953-04-29

Publications (1)

Publication Number Publication Date
GB750966A true GB750966A (en) 1956-06-20

Family

ID=22123518

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12208/54A Expired GB750966A (en) 1953-04-29 1954-04-27 Improvements in or relating to the preparation of chromic compounds

Country Status (3)

Country Link
FR (1) FR1099739A (en)
GB (1) GB750966A (en)
NL (1) NL85725C (en)

Also Published As

Publication number Publication date
FR1099739A (en) 1955-09-08
NL85725C (en)

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