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A Process Lfor Enhancing The Resistance To Darkening Of Hot Dip Galvanized Sheet, Chromating Bath And Resulted Chromated Galvanized Sheet Thereof
The invention relates to a process for enhancing the resistance to darkening of hot dip galvanized sheet comprising the steps of chromatising the galvanized sheet in a chromating bath solution at 25degreeC-60degreeC having Cr+6 ion of 2.5 to 4.5 gm/I and Cr+3 ion of 2 to 4 gm//I, having PH of 1.65 wherein in the bath nitric acid is added drop by drop until PH of the lbath reaches 1.00 to 1.60; followed by addition of cobalt nitrate in the bath; chromating the galvanized sheet in the bath for 0.5-4 seconds and drying the sheet after chromating in forced hot air at 75degree-150degreeC.The invention also relates to a chromating bath solution for treatment of GA steel sheet and the chromatized GA sheet resulted thereof.
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Notices, Deadlines & Correspondence
Notices, Deadlines & Correspondence
Patent Information
Application #
Filing Date
24 June 2002
Publication Number
22/2007
Publication Type
Invention Field
CHEMICAL
Status
Email
Parent Application
Patent Number
Legal Status
Grant Date
2008-07-03
Renewal Date
Applicants
SINGH, A.K.
RESEARCH AND DEVELOPMENT DIVISION, THE TATA IRON AND STEEL COMPANY LIMITED, JAMSHEDPUR 831001
JHA G.
RESEARCH AND DEVELOPMENT DIVISION, THE TATA IRON AND STEEL COMPANY LIMITED, JAMSHEDPUR 831001
SHOME M.
RESEARCH AND DEVELOPMENT DIVISION, THE TATA IRON AND STEEL COMPANY LIMITED, JAMSHEDPUR 831001
ROUT T.K.
RESEARCH AND DEVELOPMENT DIVISION, THE TATA IRON AND STEEL COMPANY LIMITED, JAMSHEDPUR 831001
BANDYOPADHYAY N.
RESEARCH AND DEVELOPMENT DIVISION, THE TATA IRON AND STEEL COMPANY LIMITED, JAMSHEDPUR 831001
THE TATA IRON AND STEEL COMPANY LIMITED
BOMBAY HOUSE 24 HOMI MODY STREET, MUMBAI 400001
Inventors
1. SINGH, A.K.
RESEARCH AND DEVELOPMENT DIVISION, THE TATA IRON AND STEEL COMPANY LIMITED, JAMSHEDPUR 831001
2. JHA, G.
RESEARCH AND DEVELOPMENT DIVISION, THE TATA IRON AND STEEL COMPANY LIMITED, JAMSHEDPUR 831001
3. SHOME, M.
RESEARCH AND DEVELOPMENT DIVISION, THE TATA IRON AND STEEL COMPANY LIMITED, JAMSHEDPUR 831001
4. ROUT, T.K.
RESEARCH AND DEVELOPMENT DIVISION, THE TATA IRON AND STEEL COMPANY LIMITED, JAMSHEDPUR 831001
5. BANDYOPADHYAY N.
RESEARCH AND DEVELOPMENT DIVISION, THE TATA IRON AND STEEL COMPANY LIMITED, JAMSHEDPUR 831001
Specification
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 383-cal-2002-granted-specification.pdf | 2011-10-06 |
| 2 | 383-cal-2002-granted-reply to examination report.pdf | 2011-10-06 |
| 3 | 383-cal-2002-granted-letter patent.pdf | 2011-10-06 |
| 4 | 383-cal-2002-granted-gpa.pdf | 2011-10-06 |
| 5 | 383-cal-2002-granted-form 3.pdf | 2011-10-06 |
| 6 | 383-cal-2002-granted-form 2.pdf | 2011-10-06 |
| 7 | 383-cal-2002-granted-form 18.pdf | 2011-10-06 |
| 8 | 383-cal-2002-granted-form 13.pdf | 2011-10-06 |
| 9 | 383-cal-2002-granted-form 1.pdf | 2011-10-06 |
| 10 | 383-cal-2002-granted-examination report.pdf | 2011-10-06 |
| 11 | 383-cal-2002-granted-description (complete).pdf | 2011-10-06 |
| 12 | 383-cal-2002-granted-correspondence.pdf | 2011-10-06 |
| 13 | 383-cal-2002-granted-claims.pdf | 2011-10-06 |
| 14 | 383-cal-2002-granted-abstract.pdf | 2011-10-06 |
| 15 | 383-CAL-2002-FORM-27.pdf | 2013-04-15 |
| 16 | 383-CAL-2002-11-01-2023-RELEVANT DOCUMENTS.pdf | 2023-01-11 |
| 17 | 383-CAL-2002-08-02-2023-LETTER OF PATENT.pdf | 2023-02-08 |