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JPS56158876A - Control method for coloring of stainless steel - Google Patents

Control method for coloring of stainless steel

Info

Publication number
JPS56158876A
JPS56158876A JP6149280A JP6149280A JPS56158876A JP S56158876 A JPS56158876 A JP S56158876A JP 6149280 A JP6149280 A JP 6149280A JP 6149280 A JP6149280 A JP 6149280A JP S56158876 A JPS56158876 A JP S56158876A
Authority
JP
Japan
Prior art keywords
stainless steel
time
coloring
potential difference
change
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
JP6149280A
Other languages
Japanese (ja)
Inventor
Takeshi Takeuchi
Kiyoshi Takatsu
Hidehiro Shibata
Hideo Minafuji
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 Nisshin Co Ltd
Original Assignee
Nisshin Steel Co Ltd
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 Nisshin Steel Co Ltd filed Critical Nisshin Steel Co Ltd
Priority to JP6149280A priority Critical patent/JPS56158876A/en
Publication of JPS56158876A publication Critical patent/JPS56158876A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/77—Controlling or regulating of the coating process

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

PURPOSE:To perform optimum controlling of immersion time in coloring liquid and uniformly color the surface of stainless steel by differentiating the secular change of the potential difference between the reference electrode and stainless steel in the coloring liquid by time, and controlling the slope of the differentiation curve thereof at the time of coloring the surface of the stainless steel. CONSTITUTION:Stainless steel 3 to be colored and a reference electrode 2 made of platinum are immersed in coloring liquid 1 consisting of a mixed aqueous soln. of chromic acid and sulfuric acid, whereby the surface of the stainless steel is subjected to coloring treatment. In this case, the potential difference generating across both electrodes 2 and 3 is measured at every 30-100sec with an mV meter 4, and the change of the potential difference with time is determined. With the slope alpha of the curve formed by differentiating said value by time as a change rate per unit time of a potential difference-time curve, arithmetic processing is performed rapidly. The point of time when the slope alpha switches from a decreasing tendency to an increasing tendency is made the coloring start point, and the potential difference change after this is correspondended to the change in coloring tone of the stainless steel. When it attains the preset value, the stainless steel is pulled from the coloring liquid, whereby it is uniformly colored.
JP6149280A 1980-05-09 1980-05-09 Control method for coloring of stainless steel Pending JPS56158876A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6149280A JPS56158876A (en) 1980-05-09 1980-05-09 Control method for coloring of stainless steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6149280A JPS56158876A (en) 1980-05-09 1980-05-09 Control method for coloring of stainless steel

Publications (1)

Publication Number Publication Date
JPS56158876A true JPS56158876A (en) 1981-12-07

Family

ID=13172640

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6149280A Pending JPS56158876A (en) 1980-05-09 1980-05-09 Control method for coloring of stainless steel

Country Status (1)

Country Link
JP (1) JPS56158876A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6135274A (en) * 1984-07-27 1986-02-19 Brother Ind Ltd Color printer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6135274A (en) * 1984-07-27 1986-02-19 Brother Ind Ltd Color printer

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