JPS5616696A - Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength - Google Patents

Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength

Info

Publication number
JPS5616696A
JPS5616696A JP8980379A JP8980379A JPS5616696A JP S5616696 A JPS5616696 A JP S5616696A JP 8980379 A JP8980379 A JP 8980379A JP 8980379 A JP8980379 A JP 8980379A JP S5616696 A JPS5616696 A JP S5616696A
Authority
JP
Japan
Prior art keywords
steel sheet
aqueous solution
treatment
chromate
cathode
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.)
Pending
Application number
JP8980379A
Other languages
Japanese (ja)
Inventor
Noritsugu Miyake
Takashi Ichikawa
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
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP8980379A priority Critical patent/JPS5616696A/en
Publication of JPS5616696A publication Critical patent/JPS5616696A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To inexpensively obtain the electrolytic chromic acid treated steel sheet having a superior adhesive property, by electrolytically treating the steel sheet in aqueous solution of chromic anhydride etc. making the steel sheet as cathode and next, electrolytically treating it again after carrying out nonelectrolytic dippling treatment in the same aqueous solution at a fixed time and then, washing by water and drying.
CONSTITUTION: ≥0.5sec nonelectrolytic treatment is carried out in the following component aqueous solution and the upper chromate layer having a high hydration degree, is eluted and exfoliated after electrolytically treating the steel sheet in aqueous solution of chromic anhydride, chromate, etc. making the steel sheet as cathode, at the time of manufacturing the above-mentioned steel sheet having the coating composed of metallic Cr inner layer and chromate outer layer. Next, chromate layer having a low hydration degree is forme by electrollytically treating the steel sheet with a suitable current density in the same bath again and 0.5W15sec treatment is carried out by 65W100°C, ≥4pH high temperature water and then, the above-mentioned steel sheet having a low deteriorating property on standing, is inexpensively obtaned. 2.5coulomb/dm2 cathode electrolytic treatment is allowed to carry out in aqueous solution of alkali metal etc. controlled >1.5pH, <0.5g/l sulfuric acid ion in the state of wetting the surface by flushing after carrying out the above-mentioned second electrolytic treatment.
COPYRIGHT: (C)1981,JPO&Japio
JP8980379A 1979-07-17 1979-07-17 Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength Pending JPS5616696A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8980379A JPS5616696A (en) 1979-07-17 1979-07-17 Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8980379A JPS5616696A (en) 1979-07-17 1979-07-17 Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength

Publications (1)

Publication Number Publication Date
JPS5616696A true JPS5616696A (en) 1981-02-17

Family

ID=13980867

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8980379A Pending JPS5616696A (en) 1979-07-17 1979-07-17 Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength

Country Status (1)

Country Link
JP (1) JPS5616696A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01219194A (en) * 1988-02-27 1989-09-01 Nkk Corp Pretreatment of electrolytically chromated steel sheet

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5157646A (en) * 1974-11-18 1976-05-20 Nippon Kokan Kk MITSUCHAKURYOKUNOTAKAISUIWAKUROMUSANKABUTSUSOOMOTSU TADENKAIKUROMEETOSHORIKOHANNOSEIZOHO

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5157646A (en) * 1974-11-18 1976-05-20 Nippon Kokan Kk MITSUCHAKURYOKUNOTAKAISUIWAKUROMUSANKABUTSUSOOMOTSU TADENKAIKUROMEETOSHORIKOHANNOSEIZOHO

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01219194A (en) * 1988-02-27 1989-09-01 Nkk Corp Pretreatment of electrolytically chromated steel sheet

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