JPS57101697A - Passivation of steel - Google Patents

Passivation of steel

Info

Publication number
JPS57101697A
JPS57101697A JP17687180A JP17687180A JPS57101697A JP S57101697 A JPS57101697 A JP S57101697A JP 17687180 A JP17687180 A JP 17687180A JP 17687180 A JP17687180 A JP 17687180A JP S57101697 A JPS57101697 A JP S57101697A
Authority
JP
Japan
Prior art keywords
film
steel
solution
current density
value
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
JP17687180A
Other languages
Japanese (ja)
Inventor
Tomihiko Yamada
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.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors 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 Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Priority to JP17687180A priority Critical patent/JPS57101697A/en
Publication of JPS57101697A publication Critical patent/JPS57101697A/en
Pending legal-status Critical Current

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  • Electrochemical Coating By Surface Reaction (AREA)

Abstract

PURPOSE: To carry out the passivation of steel without excessive elution of iron and with a small consumption of an agent, by carrying out the formation of a phosphate film on steel through an electrolytic treatment.
CONSTITUTION: Steel is dipped into an aqueous solution containing one or more phosphate compounds represented by the formula where X is alkali metal or NH4; and (n) is 0.5W2.5, and a current of 0.1W5.0A/dm2 is sent through the solution. With X other than the above-mentioned substances, precipitation is formed in the solution itself. Further, (n) is resticted to adjust the pH value of the solution in a range enabling the formation of a passivated film. If n<0.5, the pH value is too small so that the base metal is dissolved and the passivated film cannot be formed. If n>2.5, the pH value is too large for the film to be formed. The current density is restricted to form the passivated film efficiently. If the current density is less than the lower limit, it takes too long a time to form the film. If the current density exceeds the upper limit, large electrical equipment is required, a temperature rise of the solution becomes high and a large amount of energy is lost.
COPYRIGHT: (C)1982,JPO&Japio
JP17687180A 1980-12-15 1980-12-15 Passivation of steel Pending JPS57101697A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17687180A JPS57101697A (en) 1980-12-15 1980-12-15 Passivation of steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17687180A JPS57101697A (en) 1980-12-15 1980-12-15 Passivation of steel

Publications (1)

Publication Number Publication Date
JPS57101697A true JPS57101697A (en) 1982-06-24

Family

ID=16021247

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17687180A Pending JPS57101697A (en) 1980-12-15 1980-12-15 Passivation of steel

Country Status (1)

Country Link
JP (1) JPS57101697A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092342A2 (en) * 1982-04-17 1983-10-26 Nippon Steel Corporation Method for producing a steel strip having an excellent phosphate-coating property

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092342A2 (en) * 1982-04-17 1983-10-26 Nippon Steel Corporation Method for producing a steel strip having an excellent phosphate-coating property

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