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61. 发明专利

JPH03260044A HOT DIP GALVANIZED STEEL SHEET EXCELLENT IN DARKISH DISCOLORATION RESISTANCE 失效
公开(公告)号：JPH03260044A
公开(公告)日：1991-11-20
申请号：JP6045590
申请日：1990-03-12
申请人： NIPPON STEEL CORP
发明人： SHINDO YOSHIO , KABEYA MOTOO , SAITO KATSUSHI , TAIRA TAKETOSHI
IPC分类号： C23C2/06 , C23C28/02
摘要： PURPOSE:To produce a hot dip galvanized steel sheet excellent in darkish discoloration resistance by forming a hot dip Zn-Al coating layer on a steel sheet under specific conditions and then forming a Co-Ni alloy plating layer on the above layer under specific conditions. CONSTITUTION:A hot dipping layer having a composition which consists of, by weight, 0.2-10% Al, 0.001-0.1%, in total, of tertiary elements consisting of Ti, B, and Si, and the balance Zn and in which the amounts of inevitable impurities, such as Pb, are regulated to coating weight. Subsequently, a Co-Ni alloy plating layer in which the eutectoid ratio of Co to Ni is regulated to 1-100 and also the total coating weight is regulated to 1-10mg/m is formed on the above hot dipping layer. By this method, the hot dip galvanized steel sheet in which discoloration of the plating surface is prevented over a long period in the air or even in a high temp. and humidity environment can be obtained.

62. 发明专利

JPH0369993B2 失效
公开(公告)号：JPH0369993B2
公开(公告)日：1991-11-06
申请号：JP1746788
申请日：1988-01-29
申请人： NIPPON STEEL CORP
发明人： SAITO KATSUSHI , MYAUCHI JUJIRO , MURATA TOSHIMICHI
IPC分类号： C23C22/00 , C23C22/24 , C23C22/78 , C25D3/56 , C25D5/48 , C25D9/10 , C25D11/34 , C25D11/38

63. 发明专利

JPH0366392B2 失效
公开(公告)号：JPH0366392B2
公开(公告)日：1991-10-17
申请号：JP10372687
申请日：1987-04-27
申请人： NIPPON STEEL CORP
发明人： SAITO KATSUSHI , MYAUCHI JUJIRO
IPC分类号： C23C22/28 , C23C22/30 , C23C22/33

64. 发明专利

JPH03202480A PRODUCTION OF PLATED STEEL SHEET HAVING CORROSION-RESISTING CHROMIUM CHELATE FILM 失效
公开(公告)号：JPH03202480A
公开(公告)日：1991-09-04
申请号：JP34222589
申请日：1989-12-29
申请人： NIPPON STEEL CORP
发明人： SAITO KATSUSHI , MIYAUCHI YUJIRO
IPC分类号： C23C22/28 , C23C22/30 , C23C22/82
摘要： PURPOSE:To improve corrosion resistance, coating suitability, and chemical resistance by applying an acidic aqueous solution containing specific chromic acid and multifunctional polyol to the surface of a plated steel sheet and then carrying out baking. CONSTITUTION:An acidic aqueous solution which contains 1-100g/l of chromic acid reduced so that (trivalent Cr)/(sexivalent Cr) is 0.1/0.9 to 0.7/0.3 by the previous addition of reducing agent to chromic acid and also contains multifunctional polyol composed of novolak-type phenolic resin being a skeleton so that the ratio of the multifunctional polyol to the chromic acid is (0.01-5) to 1 is used as a chromating solution. This solution is applied to the surface of a plated steel sheet by 5-100mg/m expressed in terms of chromium coating weight, followed by baking. If necessary, one or more kinds among phosphoric acid, fluorine compound, metal metal compound, and oxide sol are incorporated to the above chromating solution so that the ratio of them to the chromic acid is (0.01-5) to 1. By this method, superior corrosion resistance and coating suitability can be obtained while reducing film thickness.

65. 发明专利

JPH0343357B2 失效
公开(公告)号：JPH0343357B2
公开(公告)日：1991-07-02
申请号：JP7706187
申请日：1987-03-30
申请人： NIPPON STEEL CORP
发明人： SAITO KATSUSHI , YAMAZAKI FUMIO , WADA KOICHI , SHINDO YOSHIO
IPC分类号： C25D15/00 , C25D3/22 , C25D15/02

66. 发明专利

JPH0324295A PRODUCTION OF BLACK SURFACE-TREATED STEEL SHEET 失效
公开(公告)号：JPH0324295A
公开(公告)日：1991-02-01
申请号：JP15833289
申请日：1989-06-22
申请人： NIPPON STEEL CORP
发明人： SAITO KATSUSHI , MIYAUCHI YUJIRO , SHIBATA KAZUMI , WADA KOICHI
IPC分类号： C25D11/38 , C23C22/24 , C23C28/02 , C25D3/56 , C25D5/48 , C25D9/08 , C25D9/10 , C25D15/00
摘要： PURPOSE:To produce the black surface-treated steel sheet excellent in appearance, workability and corrosion resistance by electroplating a cold-rolled steel sheet, a zinc alloy electroplated steel sheet, etc., in an aq. soln. consisting essentially of Zn , >=1 kind of ion among Fe , Co and Ni , an oxidizing ion and an oxy-compd. with the sheet as a cathode and then chromating the sheet as required. CONSTITUTION:The cold-rolled steel sheet, a Zn-based metal plated steel sheet, Sn plated steel sheet, etc., are electrolyzed as a cathode in an aq. soln. contg. Zn ion as the first component, the Fe , Co and Ni ions as the second component and further contg. the ions of Cr , Fe , Pb , In , Ag , Sn , Ti , Al , Cu , Mo , V , V , Mn , Mn , Mn , Bi , sulfite, thiosulfite, thiocyanate, sulfamate, sulfonate, etc., an oxidizing ion and an oxy-compd. such as phenol. The sheet is washed with water, the surface is chromated, as required, and a surfacetreated steel sheet having a blackish color tone and excellent in workability and corrosion resistance is easily produced.

67. 发明专利

JPH0251995B2 失效
公开(公告)号：JPH0251995B2
公开(公告)日：1990-11-09
申请号：JP15333486
申请日：1986-06-30
申请人： NIPPON STEEL CORP
发明人： SHINDO YOSHIO , YAMAZAKI FUMIO , SAITO KATSUSHI
IPC分类号： C25D5/18 , C25D5/26

68. 发明专利

JPH0232360B2 失效
公开(公告)号：JPH0232360B2
公开(公告)日：1990-07-19
申请号：JP14926585
申请日：1985-07-09
申请人： NIPPON STEEL CORP
发明人： SHINDO YOSHIO , SAITO KATSUSHI , TSUTSUMI MASAYA
IPC分类号： C25D3/56 , C25D5/26

69. 发明专利

JPH0278540A BLACK SURFACE TREATMENT STEEL PLATE 失效
公开(公告)号：JPH0278540A
公开(公告)日：1990-03-19
申请号：JP21973588
申请日：1988-09-02
申请人： NIPPON STEEL CORP
发明人： SHINDO YOSHIO , SAITO KATSUSHI , MIYAUCHI YUJIRO , MURATA TOSHIMICHI
IPC分类号： B05D7/14 , B32B15/08
摘要： PURPOSE:To realize high-grade external appearance by a method wherein a black inorganic film and a resin film layer, which is produced by dispersing the specified amount of black fine particles in resin and has the specified thickness, are produced on steel plate or plated steel plate. CONSTITUTION:Black inorganic film mainly consists of black compound such as hydrated oxide or sulfide of Fe, Ni, Co, Mn, Mo, Cr, Cu, Bi, V or the like and is obtained by heat treatment, chemical oxidation in solution, electrical anodic oxidation, cathodic electrolytic deposition or the like or consists of hydrated oxide or composite component of hydrated oxide and metal. The bonded amount of the film is controlled to be 0.1-3.0g/m . Further, the bonded amount of the resin film layer, in which black fine particles are dispersed, is set to be 3mum or less. The film is produced by hardening water-soluble, water- dispersible or solvent-soluble organic polymeric compound. As the black fine particle to be dispersed in the resin, carbon black having particle diameter of 50-200nm can be used. As a result, new type steel plate, the reflectance of which is low and which has gloss-controlled external appearance and is excellent in workability and corrosion resistance, can be obtained.

70. 发明专利

JPH01219193A PRODUCTION OF WHITE CHEMICAL CONVERSION-TREATED GALVANIZED STEEL SHEET 失效
公开(公告)号：JPH01219193A
公开(公告)日：1989-09-01
申请号：JP4288688
申请日：1988-02-25
申请人： NIPPON STEEL CORP
发明人： SAITO KATSUSHI , WADA KOICHI , YAMAZAKI FUMIO
IPC分类号： B05D7/14 , C25D11/36
摘要： PURPOSE:To produce the title white chemical conversion-treated galvanized steel sheet having excellent corrosion resistance by depositing the composite oxide film of phosphorus and metal on a galvanized steel sheet by cathodic electrolysis, and coating the film with a clear coating film contg. silica and resin. CONSTITUTION:A zinc or zinc alloy-plated steel sheet is cathodically electrolyzed in an aq. soln. consisting essentially of a polycondensated phosphorus compd. and a colloidal compd. Aluminum diphosphate, magnesium diphosphate, etc., can be exemplified as the polycondensated phosphorus compd., and alumina sol, silica sol, etc. as the colloidal compd. By this method, the white chemical conversion coating film of the composite oxide of phosphorus and metal is formed on the plating surface periphery in the deposition amt. of >=about 100mg/m , expressed in terms of phosphorus. A clear coating film consisting essentially of silica and resin is coated on the coating film in about 0.1-3.0mu thickness. As a result, a chemical conversion-treated galvanized steel sheet with a uniform white appearance, having excellent weldability and resistance to heat and corrosion, and difficult to flaw is obtained.

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