JPS5616697A - Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strength - Google Patents

Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strength

Info

Publication number
JPS5616697A
JPS5616697A JP9096379A JP9096379A JPS5616697A JP S5616697 A JPS5616697 A JP S5616697A JP 9096379 A JP9096379 A JP 9096379A JP 9096379 A JP9096379 A JP 9096379A JP S5616697 A JPS5616697 A JP S5616697A
Authority
JP
Japan
Prior art keywords
steel sheet
adhesive strength
standing
treating
chromic acid
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
JP9096379A
Other languages
Japanese (ja)
Inventor
Yukinobu Higuchi
Yukio Tsukamoto
Minoru Kamata
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 JP9096379A priority Critical patent/JPS5616697A/en
Publication of JPS5616697A publication Critical patent/JPS5616697A/en
Pending legal-status Critical Current

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  • Electrochemical Coating By Surface Reaction (AREA)

Abstract

PURPOSE: To obtain the above-mentioned steel sheet having no deterioration on standing of adhesive strength, by electrolytically treating in Cr acid bath having a specified ratio of SO4 --/Cr+6 at a specified electric current density and moreover, treating by a high temperature water at a specified condition after forming a fixed quantity of chromate coating on the surface of the steel sheet.
CONSTITUTION: 5W50mg/m2 chromate coating is formed on the surface of steel sheet by electrolytic Cr acid treatmtnet in the aqueous solution of chromic anhydride, etc. making the steel sheet as cathode and cathodic electrolytic treatment is carried out in chromic acid of ≥1/75, ≤1/4 SO4 --/Cr+6 ratio at ≥50°C temperature and ≤5A/dm2 electric current density as it is or after washing by water. Moreover, elution of Cr+6 and anion, such as SO4 --, etc., eluted from the chromate coating in a short time, is carried out by treating by a high temperature water of 65W100°C temperature and ≥4pH for 0.3W10sec. Thus, the above-mentioned treated steel sheet useful for adhesion can etc. and having a superior adhesive strength not deteriorated by the secular change, is obtaned.
COPYRIGHT: (C)1981,JPO&Japio
JP9096379A 1979-07-19 1979-07-19 Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strength Pending JPS5616697A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9096379A JPS5616697A (en) 1979-07-19 1979-07-19 Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strength

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9096379A JPS5616697A (en) 1979-07-19 1979-07-19 Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strength

Publications (1)

Publication Number Publication Date
JPS5616697A true JPS5616697A (en) 1981-02-17

Family

ID=14013143

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9096379A Pending JPS5616697A (en) 1979-07-19 1979-07-19 Preparation of chromic acid treaded steel sheet having low deterioration on standing of adhesive strength

Country Status (1)

Country Link
JP (1) JPS5616697A (en)

Cited By (2)

* 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
JPH04308093A (en) * 1991-04-03 1992-10-30 Nkk Corp Silicon steel sheet having electrolytic-treated insulating film and its production

Cited By (2)

* 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
JPH04308093A (en) * 1991-04-03 1992-10-30 Nkk Corp Silicon steel sheet having electrolytic-treated insulating film and its production

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