GB568161A - A method and means for electrolytically providing metals with an improved hard wearing surface of chromium - Google Patents

A method and means for electrolytically providing metals with an improved hard wearing surface of chromium

Info

Publication number
GB568161A
GB568161A GB15031/43A GB1503143A GB568161A GB 568161 A GB568161 A GB 568161A GB 15031/43 A GB15031/43 A GB 15031/43A GB 1503143 A GB1503143 A GB 1503143A GB 568161 A GB568161 A GB 568161A
Authority
GB
United Kingdom
Prior art keywords
chromium
hard
grams
soft
bath
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
GB15031/43A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB15031/43A priority Critical patent/GB568161A/en
Publication of GB568161A publication Critical patent/GB568161A/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
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
    • C25D5/611—Smooth layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
    • C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/627—Electroplating characterised by the visual appearance of the layers, e.g. colour, brightness or mat appearance

Abstract

568,161. Electrodepositing chromium. PEACH, A. L. Sept. 14, 1943, No. 15031.. [Class 41] [Also in Group II] High-speed tool steels and other basis metals are given a hard wear-resisting, firmly-adherent, surface by depositing thereon an inner layer of soft chromium and then an outer layer of hard chromium ; or, if a wear-resistant surface is not essential, a further deposit of soft chromium may be applied and may be followed by another of hard chromium. The cleaned basis metal is first immersed in the "soft" bath for five minutes before current is passed, a current of 300 amps. /ft.<2> then being passed for 30 minutes at a temperature of 30-90‹ C., and preferably at 50‹ C. The article is then rinsed in water at 50‹ C. and treated in the '' hard " bath at 52‹ C. and 200 amps. density. The " hard " bath comprises 250 grams of pure chromic acid (Cr03) per litre and 2.5 grams of sulphuric acid. The " soft " bath additionally contains 15-42 grams of ferrous hydroxide or carbonate, 20 grams being the preferred figure, or 15-30 grams of nickel hydroxide or carbonate or aluminium hydroxide. Specification 566,218 is referred to. The Provisional Specification sets out temperatures of 70‹ and 50‹ C. for the '' soft and " hard baths, respectively, and gives the following ingredients for a tool-steel alloy : 12-22 per cent tungsten, 2-6 per cent chromium, 0.3-0.5 per cent vanadium, and traces of cobalt.
GB15031/43A 1943-09-14 1943-09-14 A method and means for electrolytically providing metals with an improved hard wearing surface of chromium Expired GB568161A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB15031/43A GB568161A (en) 1943-09-14 1943-09-14 A method and means for electrolytically providing metals with an improved hard wearing surface of chromium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15031/43A GB568161A (en) 1943-09-14 1943-09-14 A method and means for electrolytically providing metals with an improved hard wearing surface of chromium

Publications (1)

Publication Number Publication Date
GB568161A true GB568161A (en) 1945-03-21

Family

ID=10051826

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15031/43A Expired GB568161A (en) 1943-09-14 1943-09-14 A method and means for electrolytically providing metals with an improved hard wearing surface of chromium

Country Status (1)

Country Link
GB (1) GB568161A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873154A (en) * 1954-01-04 1959-02-10 Harold F Marker Piston packing rings and method of producing same
US3099609A (en) * 1961-09-11 1963-07-30 Katayose Kimiyoshi Method of electroplating aluminum or its alloy with porous hard chromium
US3157585A (en) * 1959-12-18 1964-11-17 Gen Motors Corp Chromium plating
US3753664A (en) * 1971-11-24 1973-08-21 Gen Motors Corp Hard iron electroplating of soft substrates and resultant product
US4039399A (en) * 1971-03-11 1977-08-02 Dana Corporation Method of making a bearing surface
USH543H (en) 1986-10-10 1988-11-01 The United States Of America As Represented By The Secretary Of The Army Laminated chromium composite

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873154A (en) * 1954-01-04 1959-02-10 Harold F Marker Piston packing rings and method of producing same
US3157585A (en) * 1959-12-18 1964-11-17 Gen Motors Corp Chromium plating
US3099609A (en) * 1961-09-11 1963-07-30 Katayose Kimiyoshi Method of electroplating aluminum or its alloy with porous hard chromium
US4039399A (en) * 1971-03-11 1977-08-02 Dana Corporation Method of making a bearing surface
US3753664A (en) * 1971-11-24 1973-08-21 Gen Motors Corp Hard iron electroplating of soft substrates and resultant product
USH543H (en) 1986-10-10 1988-11-01 The United States Of America As Represented By The Secretary Of The Army Laminated chromium composite

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