GB503903A - Improvements in or relating to chromium plating - Google Patents

Improvements in or relating to chromium plating

Info

Publication number
GB503903A
GB503903A GB29755/38A GB2975538A GB503903A GB 503903 A GB503903 A GB 503903A GB 29755/38 A GB29755/38 A GB 29755/38A GB 2975538 A GB2975538 A GB 2975538A GB 503903 A GB503903 A GB 503903A
Authority
GB
United Kingdom
Prior art keywords
layer
chromium
relating
oct
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
GB29755/38A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB503903A publication Critical patent/GB503903A/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
    • C25D5/10—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

503,903. Electrodeposition of chromium. BOSCH GES., R. Oct. 14,1938, No. 29755. Convention date, Oct. 27, 1937. (Class 41] Metals are given a corrosion resisting, highly polished chromium coating, by electrodepositing a layer of chromium, polishing it and then depositing a second layer of chromium which is not polished. The first layer is, e.g. 2 to 10 Á, and of greater thickness than the second layer which may be 0À05 to 0À5 Á. The bath for the first coating is chromic acid-sulphuric acid at 40 to 45‹ C., and to achieve brilliancy and adhesiveness of the second layer, the bath is raised to 54 to 56‹ C. or the articles being coated are heated.
GB29755/38A 1937-10-27 1938-10-14 Improvements in or relating to chromium plating Expired GB503903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE503903X 1937-10-27

Publications (1)

Publication Number Publication Date
GB503903A true GB503903A (en) 1939-04-17

Family

ID=6546108

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29755/38A Expired GB503903A (en) 1937-10-27 1938-10-14 Improvements in or relating to chromium plating

Country Status (2)

Country Link
FR (1) FR845205A (en)
GB (1) GB503903A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421986A (en) * 1964-10-28 1969-01-14 Teves Kg Alfred Method of electroplating a bright adherent chromium coating onto cast-iron
US4039399A (en) * 1971-03-11 1977-08-02 Dana Corporation Method of making a bearing surface

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421986A (en) * 1964-10-28 1969-01-14 Teves Kg Alfred Method of electroplating a bright adherent chromium coating onto cast-iron
US4039399A (en) * 1971-03-11 1977-08-02 Dana Corporation Method of making a bearing surface

Also Published As

Publication number Publication date
FR845205A (en) 1939-08-16

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