GB997980A - Improvements in processes for producing chemical conversion coatings on magnesium alloy surfaces - Google Patents

Improvements in processes for producing chemical conversion coatings on magnesium alloy surfaces

Info

Publication number
GB997980A
GB997980A GB9844/64A GB984464A GB997980A GB 997980 A GB997980 A GB 997980A GB 9844/64 A GB9844/64 A GB 9844/64A GB 984464 A GB984464 A GB 984464A GB 997980 A GB997980 A GB 997980A
Authority
GB
United Kingdom
Prior art keywords
solution
magnesium alloy
chemical conversion
water
processes
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
GB9844/64A
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.)
Henkel Corp
Original Assignee
Amchem Products Inc
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 Amchem Products Inc filed Critical Amchem Products Inc
Publication of GB997980A publication Critical patent/GB997980A/en
Expired legal-status Critical Current

Links

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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
    • C23C22/33—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds containing also phosphates
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/78—Pretreatment of the material to be coated

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

A chemical conversion coating is formed on a magnesium alloy containing between 6% and 9% by weight of aluminium by treating first with a solution having a pH from 7.0-11.0, and containing a fluoride and a phosphate, at a temperature between 55 DEG C. and 82 DEG C., rinsing with water and then treating at a temperature between 21 DEG C. and 88 DEG C. with a solution (pH 0.8-1.2) free from halide and sulphate ions and containing tri- and hexavalent chromium and a phosphate. The solutions may have non-ionic wetting agents, e.g. polyethoxylated phenols. In an example, the first solution (pH 9.5) contains (parts in grams) tetrasodium pyrophosphate 17, sodium fluoride 3.4, water to make 1 litre (pH 9.5). The second solution (pH 1) contains sodium dihydrogen phosphate 6.8, sodium dichromate 2.8, chromium trioxide 5.4, chromic nitrate 6, water 1 litre.
GB9844/64A 1963-03-12 1964-03-09 Improvements in processes for producing chemical conversion coatings on magnesium alloy surfaces Expired GB997980A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US264660A US3278343A (en) 1963-03-12 1963-03-12 Conversion coating of magnesium alloy surfaces

Publications (1)

Publication Number Publication Date
GB997980A true GB997980A (en) 1965-07-14

Family

ID=23007064

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9844/64A Expired GB997980A (en) 1963-03-12 1964-03-09 Improvements in processes for producing chemical conversion coatings on magnesium alloy surfaces

Country Status (2)

Country Link
US (1) US3278343A (en)
GB (1) GB997980A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180263A (en) * 1985-09-05 1987-03-25 Nihon Parkerizing Chromating solutions
CN115491666A (en) * 2022-09-07 2022-12-20 深圳市飞航精工科技有限公司 Conductive oxidation process for magnesium alloy high-salt-spray test

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477882A (en) * 1965-12-13 1969-11-11 Lubrizol Corp Method of and composition for preventing "white rust" formation
JP2001288580A (en) * 2000-03-31 2001-10-19 Nippon Parkerizing Co Ltd Surface treating method for magnesium alloy and magnesium alloy member
CN101130864B (en) * 2006-08-25 2010-10-06 佛山市顺德区汉达精密电子科技有限公司 Surface treating method for magnesium alloy
US20230279524A1 (en) * 2022-03-04 2023-09-07 Magnesium Products of America Inc. Cast magnesium alloy with improved ductility

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE563956A (en) * 1957-01-31
US3122457A (en) * 1961-09-18 1964-02-25 Dow Chemical Co Protective coating for magnesium and zinc

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180263A (en) * 1985-09-05 1987-03-25 Nihon Parkerizing Chromating solutions
GB2180263B (en) * 1985-09-05 1989-08-16 Nihon Parkerizing Processes for treating zinc surfaces
CN115491666A (en) * 2022-09-07 2022-12-20 深圳市飞航精工科技有限公司 Conductive oxidation process for magnesium alloy high-salt-spray test

Also Published As

Publication number Publication date
US3278343A (en) 1966-10-11

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