GB1235893A - A method of treating iron and steel products having a film containing chromium on the surface - Google Patents

A method of treating iron and steel products having a film containing chromium on the surface

Info

Publication number
GB1235893A
GB1235893A GB1889768A GB1889768A GB1235893A GB 1235893 A GB1235893 A GB 1235893A GB 1889768 A GB1889768 A GB 1889768A GB 1889768 A GB1889768 A GB 1889768A GB 1235893 A GB1235893 A GB 1235893A
Authority
GB
United Kingdom
Prior art keywords
chromium oxide
april
bath
hydrated chromium
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
GB1889768A
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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
Priority claimed from JP2626367A external-priority patent/JPS4637404B1/ja
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of GB1235893A publication Critical patent/GB1235893A/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

1,235,893. Improving corrosion resistance of ferrous bodies. NIPPON STEEL CORP. April 22, 1968 [April 21, 1967 (2); April 26, 1967], No.18897/68. Heading C7B. A method of improving the resistance to corrosion of an iron or steel body having a film on its surface of metallic chromium and/or hydrated chromium oxide comprises dipping the body into an aqueous bath containing one or more of sulphurcontaining anions, halogen-containing anions, and nitric acid ions and substantially free from ions which plate out as metal from the bath and electrolytically treating it as cathode so that a hydrogen discharge occurs which modifies the chromium or hydrated chromium oxide film. Typically this cathodic hydrogen treatment is effected in an IN bath of sodium sulphate at 20‹ C. or 50‹ C., or from IN solutions of sodium fluoride, sodium chloride or ammonium sulphate at 50‹ C., the current density and treatment time varying over wide ranges. The chromium and hydrated chromium oxide films may be electro-deposited on the iron or steel body from the usual baths or the hydrated chromium oxide may be cathodically deposited from a low concentration chromic acid bath containing sodium perchlorate. The hydrogen treated bodies readily receive synthetic resin paints.
GB1889768A 1967-04-21 1968-04-22 A method of treating iron and steel products having a film containing chromium on the surface Expired GB1235893A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2547467 1967-04-21
JP2547367 1967-04-21
JP2626367A JPS4637404B1 (en) 1967-04-26 1967-04-26

Publications (1)

Publication Number Publication Date
GB1235893A true GB1235893A (en) 1971-06-16

Family

ID=27285032

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1889768A Expired GB1235893A (en) 1967-04-21 1968-04-22 A method of treating iron and steel products having a film containing chromium on the surface

Country Status (3)

Country Link
BE (1) BE713899A (en)
FR (1) FR1562485A (en)
GB (1) GB1235893A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2748099A1 (en) * 1996-04-25 1997-10-31 Mitsubishi Heavy Ind Ltd Heat exchange tube support plate for Electro-thermal installation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2465011A1 (en) * 1979-09-06 1981-03-20 Carnaud Sa MATERIAL CONSISTING OF A PROTECTED STEEL SHEET, METHOD FOR MANUFACTURING SAME, AND APPLICATIONS THEREOF, IN PARTICULAR TO PRESERVE BOXES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2748099A1 (en) * 1996-04-25 1997-10-31 Mitsubishi Heavy Ind Ltd Heat exchange tube support plate for Electro-thermal installation

Also Published As

Publication number Publication date
DE1771207A1 (en) 1972-03-09
BE713899A (en) 1968-09-16
FR1562485A (en) 1969-04-04
DE1771207B2 (en) 1976-09-09

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