JPS57101697A - Passivation of steel - Google Patents
Passivation of steelInfo
- 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
Links
Landscapes
- 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
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)
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 |
-
1980
- 1980-12-15 JP JP17687180A patent/JPS57101697A/en active Pending
Cited By (1)
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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