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102 records (took 0.031 seconds)

    92.
    发明专利
    未知

    公开(公告)号：FI63263C

    公开(公告)日：1983-05-10

    申请号：FI793514

    申请日：1979-11-09

    Applicant: IBM

    Inventor： BARCLAY DONALD JOHN ,  VIGAR JAMES MICHAEL LINFORD

    IPC: C25D3/06 ,  C25D5/14

    Abstract: A very low concentration (below 0.03 M) trivalent chromium plating bath in which the source of chromium is an equilibrated aqueous solution of a chromium (III) - thiocyanate complex gives a deposit of unexpectedly light color. Such a bath is employed to produce thin overcoatings of light colored chromium for decorative applications. The bath and process is also used to plate the initial layer of a thick (greater than 5 micron) deposit for engineering applications, the major part of which is plated from a higher chromium concentration bath. Such thick deposits from a higher concentration bath are more cohesive and smoother when plated over an initial layer from the low concentration bath.

    93.
    发明专利
    未知

    公开(公告)号：FI63263B

    公开(公告)日：1983-01-31

    申请号：FI793514

    申请日：1979-11-09

    Applicant: IBM

    Inventor： BARCLAY DONALD JOHN ,  VIGAR JAMES MICHAEL LINFORD

    IPC: C25D3/06 ,  C25D5/14

    Abstract: A very low concentration (below 0.03 M) trivalent chromium plating bath in which the source of chromium is an equilibrated aqueous solution of a chromium (III) - thiocyanate complex gives a deposit of unexpectedly light color. Such a bath is employed to produce thin overcoatings of light colored chromium for decorative applications. The bath and process is also used to plate the initial layer of a thick (greater than 5 micron) deposit for engineering applications, the major part of which is plated from a higher chromium concentration bath. Such thick deposits from a higher concentration bath are more cohesive and smoother when plated over an initial layer from the low concentration bath.

    Electrodeposition of bright chromium coatings - using chromium iii-thiocyanate complex bath, the chromium concn. being very low
    95.
    发明专利
    Electrodeposition of bright chromium coatings - using chromium iii-thiocyanate complex bath, the chromium concn. being very low 未知

    公开(公告)号：DE2944142A1

    公开(公告)日：1980-05-29

    申请号：DE2944142

    申请日：1979-11-02

    Applicant: IBM

    Inventor： BARCLAY DONALD JOHN ,  LINFORD JAMES MICHAEL

    IPC: C25D3/06

    Abstract: The Cr concn. is 0.03M and is sufficiently weak to give a deposit whose colour is at least as bright as that of vapour deposited Cr. Bright Cr coatings can be formed (without the attendant problems of using Cr6+ baths) for decorative applications, and thick, coherent, smooth coatings can be formed for structural and mechanical applications. The ratio of the molar concns. of Cr/thiocyanate is pref. 1 : 2-4. The soln. pref. also contains an amino-acid (pref. aspartic acid) as buffer, in a molar concn. 1.25 times that of Cr. The bath temp. for a bright coating is pref. 40-60 degrees C, the brightest coloured coatings being formed using a current density >50 mA/cm2. The Cr concn. is pref. =0.02M. The pH of the bath is pref. 3.8 - 4.5.

    97.
    发明专利
    未知

    公开(公告)号：FI793514A

    公开(公告)日：1980-05-12

    申请号：FI793514

    申请日：1979-11-09

    Applicant: IBM

    Inventor： BARCLAY DONALD JOHN ,  VIGAR JAMES MICHAEL

    IPC: C25D3/06 ,  C25D5/14 ,  C25D

    Abstract: A very low concentration (below 0.03 M) trivalent chromium plating bath in which the source of chromium is an equilibrated aqueous solution of a chromium (III) - thiocyanate complex gives a deposit of unexpectedly light color. Such a bath is employed to produce thin overcoatings of light colored chromium for decorative applications. The bath and process is also used to plate the initial layer of a thick (greater than 5 micron) deposit for engineering applications, the major part of which is plated from a higher chromium concentration bath. Such thick deposits from a higher concentration bath are more cohesive and smoother when plated over an initial layer from the low concentration bath.

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