GB1044962A - Producing a protective coating on metal by cathodic coating - Google Patents

Producing a protective coating on metal by cathodic coating

Info

Publication number
GB1044962A
GB1044962A GB23025/63A GB2302563A GB1044962A GB 1044962 A GB1044962 A GB 1044962A GB 23025/63 A GB23025/63 A GB 23025/63A GB 2302563 A GB2302563 A GB 2302563A GB 1044962 A GB1044962 A GB 1044962A
Authority
GB
United Kingdom
Prior art keywords
coating
metal
salt
typically
sufficient
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
GB23025/63A
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.)
Yawata Iron and Steel Co Ltd
Original Assignee
Yawata Iron and Steel 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 Yawata Iron and Steel Co Ltd filed Critical Yawata Iron and Steel Co Ltd
Publication of GB1044962A publication Critical patent/GB1044962A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/38—Chromatising

Abstract

A tough protective coating is cathodically deposited on a metal base, e.g. of steel, zinc-electroplated steel, or aluminium sheet, from an aqueous solution of pH<1.5 containing a hexavalent chromium compound and a halogen oxyacid or a salt thereof. The halogen oxyacid or salt which may be present in an amount of 1 to 200 g/l is typically perchloric acid, sodium perchlorate, potassium chlorate, or sodium or potassium bromate, while the hexavalent chromium compound which may be in a concentration of 10 to 300 g/l is typically chromic acid but may be a soluble chromate or dichromate together with sufficient perchloric or nitric acid to obtain the necessary pH. Bath temperatures may be from 10 to 90 DEG C with cathode current densities up to 20 A/sq.dm. and treatment times of not more than 1 second. The colour of the coating varies with its thickness, endures working without peeling and accepts paint, for which purpose a coating thickness corresponding to 2 to 3 mg/sq.dm. is sufficient. Before coating the metal is degreased and if rust is present it is pickled, and after coating it is subjected to an alkali dip in dilute sodium hydroxide or ammonia solution.
GB23025/63A 1962-06-13 1963-06-10 Producing a protective coating on metal by cathodic coating Expired GB1044962A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2391062 1962-06-13

Publications (1)

Publication Number Publication Date
GB1044962A true GB1044962A (en) 1966-10-05

Family

ID=12123617

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23025/63A Expired GB1044962A (en) 1962-06-13 1963-06-10 Producing a protective coating on metal by cathodic coating

Country Status (3)

Country Link
US (1) US3288691A (en)
DE (1) DE1521098B2 (en)
GB (1) GB1044962A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1106292A (en) * 1963-12-04 1968-03-13 Ass Chem Co Improvements in or relating to the treatment of metals
US3535213A (en) * 1967-12-20 1970-10-20 Yawata Seitetsu Kk Method of surface-treating metals
JPS62107096A (en) * 1985-11-01 1987-05-18 Nippon Parkerizing Co Ltd Surface treatment of galvanized steel sheet
JPH03223472A (en) * 1990-01-25 1991-10-02 Nippon Parkerizing Co Ltd Surface treating liquid and surface treatment for galvanized steel sheet

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780592A (en) * 1951-08-22 1957-02-05 Bethlehem Steel Corp Electrolytic treatment of metal surfaces
US2769774A (en) * 1952-08-05 1956-11-06 Republic Steel Corp Electrodeposition method
FR1080914A (en) * 1953-06-16 1954-12-14 United States Steel Corp Electrochemical process for coating steel surfaces, products intended for its implementation and resulting products
GB915426A (en) * 1958-05-30 1963-01-09 Yawata Iron & Steel Co Electrolytic treatment of metal surfaces
US3032487A (en) * 1958-05-30 1962-05-01 Yawata Iron & Steel Co Electrolytic treatment of ferrous metal surfaces
US2998361A (en) * 1958-06-11 1961-08-29 Toyo Kohan Co Ltd Electrochemical treatment of metal surfaces and the products thereof
US3081238A (en) * 1958-09-03 1963-03-12 Quaker Chem Corp Electrolytic treatment of metal surfaces
US3138548A (en) * 1961-04-11 1964-06-23 Inland Steel Co Tin plate treatment

Also Published As

Publication number Publication date
DE1521098B2 (en) 1971-05-06
US3288691A (en) 1966-11-29
DE1521098A1 (en) 1970-08-20

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