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41. 发明专利

JP2001247977A CHROMIUM-FREE COMPOSITION FOR METAL SURFACE TREATMENT 失效
公开(公告)号：JP2001247977A
公开(公告)日：2001-09-14
申请号：JP2000063280
申请日：2000-03-03
申请人： HITACHI LTD
发明人： MABUCHI KATSUMI , ARAI YUKO , HONBO MICHIKO , FUJII KAZUMI
IPC分类号： C25D11/36 , C23C22/40 , C23C22/42 , C23C22/46 , C23C22/47
摘要： PROBLEM TO BE SOLVED: To form a film having satisfactory and uniform appearance and excellent corrosion resistance properties without using chromium harmful to the environment and the human body when forming a protective film on the surface of steel, a galvanized steel, aluminum or the like. SOLUTION: In this chromium-free composition for metal surface treatment, a film formed by surface treatment to a metallic surface contains plural metallic elements, and, at least one above metallic element has plural valences.

42. 发明专利

JPH11158699A METHOD FOR DESCALING STAINLESS STEEL STRIP AND ITS CONTINUOUS PRODUCTION DEVICE 失效
公开(公告)号：JPH11158699A
公开(公告)日：1999-06-15
申请号：JP32268597
申请日：1997-11-25
申请人： HITACHI LTD , HITACHI KYOWA ENGINEERING KK
发明人： MABUCHI KATSUMI , KIKUCHI TOMOKO , KANI YASUNORI , NAKAMURA TSUNEO , HIRAGA MAKOTO , ITO MASAHIKO
IPC分类号： C21D1/70 , C25F1/06
摘要： PROBLEM TO BE SOLVED: To provide a method for descaling stainless steel strip without need for high-temp. treatment in cold rolling and with good brightness and smoothness and to furnish its continuous production device. SOLUTION: A cold rolling mill 11, an annealing furnace 12 and a descaler are included in a continuous production line, and the annealing furnace is controlled to a weakly acidic atmosphere. The descaler consists of neutral brine electrolysis-nitric acid electrolysis, dipping in aq. nitric acid-hydrofluoric acid mixed soln., neutral brine electrolysis-aq. alkali soln. electrolysis-nitric acid electrolysis, dipping in aq. nitric acid-hydrofluoric acid mixed soln., neutral brine electrolysis-aq. sulfuric acid electrolysis-nitric acid electrolysis or dipping in aq. nitric acid-hydrofluoric acid mixed soln.

43. 发明专利

JPH09159326A ABSORPTION TYPE REFRIGERATION MACHINE AND ITS MANUFACTURE 失效
公开(公告)号：JPH09159326A
公开(公告)日：1997-06-20
申请号：JP26274996
申请日：1996-10-03
申请人： HITACHI LTD
发明人： MABUCHI KATSUMI , MIDORIKAWA HEIHACHIRO , KIKUCHI TOMOKO , HONDA TAKU , AIZAWA MICHIHIKO , ITO MASAHIKO
IPC分类号： F25B15/00 , C23C8/18 , F25B33/00 , F25B47/00
摘要： PROBLEM TO BE SOLVED: To prevent the cooling efficiency form dropping due to hydrogen gas generation during operation of a refrigerating machine, and ensure a high corrosion resistance by a corrosion-preventive layer by forming an oxide layer with a specified thickness at least on the surface of either a heat exchanger or a high-temperature regenerator. SOLUTION: An oxide layer with a thickness of 0.02-5.0μm is formed at least on the surface of either a heat exchanger 2 or a high-temperature regenerator 1. This oxidation treatment is carried out in such a way that a refrigeration machine is temporarily assembled without non-heat resistance equipment such as pumps and others, an air fan 6 with a heater 5 is connected to a gas supply pipe 4 that is installed near the high-temperature regenerator 1, a valve 7a is closed, a valve 7b is opened to feed high-temperature hot air into the refrigerating machine. Thereby, as the high-temperature hot air is sent into an absorber 3 through the high-temperature regenerator 1 and the heat exchanger 2, the corrosion-preventive effect is enhanced and the reliability of the product is improved.

44. 发明专利

JPH09157828A SURFACE TREATMENT OF CARBON STEEL MEMBER FOR ATOMIC POWER PLANT 失效
公开(公告)号：JPH09157828A
公开(公告)日：1997-06-17
申请号：JP31995695
申请日：1995-12-08
申请人： HITACHI LTD
发明人： TAKAMORI YOSHIYUKI , HONDA TAKU , ONAKA NORIYUKI , MABUCHI KATSUMI , MIKI MINORU
IPC分类号： G21D1/00 , C23C8/14
摘要： PROBLEM TO BE SOLVED: To suppress the sticking of radioactive substance to the surface of a carbon steel member by previously grinding the surface of a carbon steel member to be contacted with cooling water in which radioactive substance is dissolved and thereafter heating the same to a specified temp. in an oxidizing atmosphere. SOLUTION: The inside face always to be contacted with a radioactive substance-contg. liq. of piping made of carbon steel used for a primary cooling water system of an atomic power plant is previously subjected to mechanical grinding so as to regulate the surface roughness to

45. 发明专利

JPH0892800A TREATMENT OF NEUTRAL SALT ELECTROLYTE, AND TREATING DEVICE THEREFOR, DESCALING OF STAINLESS STEEL AND DEVICE THEREFOR 失效
公开(公告)号：JPH0892800A
公开(公告)日：1996-04-09
申请号：JP15297895
申请日：1995-06-20
申请人： HITACHI LTD
发明人： MABUCHI KATSUMI , MIDORIKAWA HEIHACHIRO , NAKAMURA TSUNEO , ITO MASAHIKO
IPC分类号： C25F1/06 , C25F7/02
摘要： PURPOSE: To efficiently recover heavy metal ions from an electrolyte by using one of sulfoxylic acid, dithionous acid, sulfurous acid, pyrosulfurous acid, pyrosulfuric acid, peroxosulfuric acid, peroxodisulfuric acid, polythionic acid and hydrosulfurous acid as a reducing agent. CONSTITUTION: Stainless steel 1 is dipped into an electrolytic bath using a neutral salt aq. solution of sodium sulfate as the electrolyte 21 and is descaled by electrolysis. The electrolyte 21 in the electrolytic bath 2 is received in a reducing vessel 4 through a reserve tank 3. The electrolyte 21 in the reducing vessel 4 is adjusted in pH to 1-2 by adding sulfuric acid and sodium hydroxide and is reduced by adding an acid or a metallic salt of the acid. Sodium hydroxide is added into the reduced electrolyte 21 transported to a neutralizing vessel 5 to make pH >=5 and to convert the heavy metal into the hydroxide. The electrolyte 21 is passed through a precipitator 6 and a filter 7 to remove the heavy metal and is fed to the reserve tank 3 as the clean electrolyte 21.

46. 发明专利

JPH07270371A INTERNAL REFERENCE ELECTRODE AND ABSORPTION TYPE REFRIGERATOR 失效
公开(公告)号：JPH07270371A
公开(公告)日：1995-10-20
申请号：JP6306194
申请日：1994-03-31
申请人： HITACHI LTD
发明人： KIKUCHI TOMOKO , FUJII KAZUMI , MABUCHI KATSUMI , ITO MASAHIKO
IPC分类号： G01N27/26 , F25B49/02 , F25B49/04 , G01N27/30 , G01N27/416
摘要： PURPOSE:To obtain an internal reference electrode capable of stably measuring potential over a long period of time by providing an aq. soln. of which the vapor pressure at a specific temp. is set to a specific value or less as an internal soln. CONSTITUTION:Silver bromide 2 is welded to the periphery of the lower end part of a silver rod 2 to be inserted in a main body container 3 and the upper end of the silver rod 2 is held with a nut 4 and the container 3 is filled with an LiBr aq. soln. 5 wherein silver bromide 1 forms a complex along with Br . A lower connector 6 and a liquid junction 7 composed of porous sintered zirconia are attached to the container 3. When the LiBr aq. soln. is used in an electrode and vapor pressure at about 100 deg.C is adjusted to about 80-170mmHg, the inner and outer pressures of a reference electrode are balanced and the outflow of the internal soln. and the inflow thereof from use environment can be suppressed. When the corrosive state of an absorption type refrigerator is monitored by using this internal reference electrode, the reliability and durability of the freezer can be enhanced.

47. 发明专利

JPH0649686A MANUFACTURE OF THIN FILM SEMICONDUCTOR ELEMENT 失效
公开(公告)号：JPH0649686A
公开(公告)日：1994-02-22
申请号：JP20904792
申请日：1992-08-05
申请人： HITACHI LTD
发明人： MABUCHI KATSUMI , SAKAI MASANORI , ONAKA NORIYUKI , TAKAHASHI TAKUYA , NAGAE KEIJI , MIKAMI YOSHIAKI
IPC分类号： C25D7/12 , H01L21/336 , H01L29/78 , H01L29/786 , H01L31/04 , H01L29/784
摘要： PURPOSE:To easily obtain a semiconductor element with which the film thickness and conductivity are uniformly controlled by impressing the pulse signal of a fixed current or voltage on a substrate forming a conductive layer thereon and electrodepositing the semiconductor in a short time in an electrolytic bath. CONSTITUTION:After importing a noble metal catalyst, such as Au or Pt on the surface of a substrate 12, the surface is plated to form a conductive layer 13. Next, the substrate 12 is charged into the electrolytic bath containing elements for dope to electrodeposit the n-type or p-type semiconductor (amolphous semiconductor) 14 having an optional conductivity on the conductive layer 13. The electrodeposition is performed by using an external circuit provided on the outside of the electrolytic bath and impressing the pulse signal of a constant or constant voltage between the substrate 12 and a counter electrode at a fixed interval of time. Then, electrodes 20a, 20b are formed on the semiconductor 14.

48. 发明专利

JPH04127046A PH MEASUREMENT METHOD USING TUNNEL PHENOMENON 失效
公开(公告)号：JPH04127046A
公开(公告)日：1992-04-28
申请号：JP24749090
申请日：1990-09-19
申请人： HITACHI LTD
发明人： YAMAUCHI HIROSHI , SAKAI MASANORI , MABUCHI KATSUMI , TAKAHASHI TAKUYA , ONAKA NORIYUKI
IPC分类号： G01N27/06 , G01N37/00 , G01Q60/10
摘要： PURPOSE:To enable measurement of pH in a very small area in addition to a normal pH measurement by a method wherein a potential of a metal electrode is fixed at a certain value and the potential of a semiconductor electrode is scanned in a wide range to determine a flat and band potential at which a tunnel current is down to zero. CONSTITUTION:Potential of a metal probe electrode 1 is so set as not to allow an electrochemical reaction and with a coarsely moving mechanism 10, the probe electrode 1 is brought closer to 1mum from the surface of a sample semiconductor electrode 3 and a voltage is applied to a piezo-electric element 2. Then, the probe electrode 1 is further brought closer to the surface of the sample pole 3 until the current value reaches a specified one and the distance is kept constant between the electrodes 1 and 3 as it is. Thereafter, the potential of the sample pole 3 is scanned with an arbitrary-waveform generator 9 linearly in a noble direction at a fixed speed to record a tunnel current then observed as function of the potential. Potential at which current is down to zero is defined as flat band potential Efb and pH of a solution to be tested in an electrochemical cell 6 is determined from the relation of Efb: pH determined previously. Thus, the determination of pH in a very small area is possible and is very effective for clarifying a reaction mechanism in an electrochemical field including corrosion phenomenon.

49. 发明专利

JPH03154858A METHOD AND DEVICE FOR MATERIAL EVALUATION USING OPTICAL MEASUREMENT 失效
公开(公告)号：JPH03154858A
公开(公告)日：1991-07-02
申请号：JP29386689
申请日：1989-11-14
申请人： HITACHI LTD
发明人： MABUCHI KATSUMI , TAKAHASHI TAKUYA , SAKAI MASANORI , IZUMITANI MASAKIYO
IPC分类号： G01N21/00 , G01N27/00
摘要： PURPOSE:To evaluate the anticorrosiveness of a material in its use state by measuring a photocurrent which flows by scanning irradiation with a light spot, comparing measured values and evaluating the homogeneity of the material according to the comparison result. CONSTITUTION:Scanning spot light emitted by a light generating device 9 and an optical converging device 17 which are controlled by the remote operation control command device 25 of the evaluating device 7 is passed through an optical cable fiber 17 to irradiate a material piece 15 to be measured which is made of the same material with piping 3 provided to reactor water recirculation system piping 3 coupled with a nuclear reactor pressure container 1 and contacts water as well as the piping 3. The photocurrent flows between the material piece 15 to be tested and a counter electrode 19 and measured by a photocurrent measuring instrument 27 and an arithmetic process compares measured values for respective light scanning irradiation positions to evaluate the homogeneity of the material piece 15 to be tested, so that the evaluation result is displayed on a display device 15. Consequently, the anticorrosiveness, etc., of the reactor water recirculation piping material, etc., of the nuclear reactor pressure container can be evaluated in the use state.

50. 发明专利

JPH02242146A METHOD AND APPARATUS FOR LOCAL CORROSION REACTION ANALYSIS 失效
公开(公告)号：JPH02242146A
公开(公告)日：1990-09-26
申请号：JP6336489
申请日：1989-03-15
申请人： HITACHI LTD
发明人： SAKAI MASANORI , ONAKA NORIYUKI , KIRINO FUMIYOSHI , NAKAGAWA YUSAKU , KIKUCHI EIJI , MABUCHI KATSUMI , TAKAHASHI TAKUYA
IPC分类号： G01N27/26 , G01N17/02
摘要： PURPOSE:To enable the clarification of a mechanism with the obtaining of information on the substance of a local corrosion reaction by a method wherein a current distribution map of the surface of material to be measured is prepared to detect a location of a local corrosion reaction and corrosion causative material qualitatively and quantitatively. CONSTITUTION:A micro electrode 6 for detection is set on a sample 1 and vibrated with a Z-axis fine adjusting mechanism 7 being swept on a YX surface to detect potentials at points of the sample 1. A computer system 18 determines a current by a corrosion reaction from a potential difference to generate a current distribution map at XY coordinate points and it is shown on a CRT. A location of a local corrosion is detected from the map and the electrode 6 is set at the location. Then, a current and potential generated by molecules and ions produced and eluted by the corrosion reaction progressing are measured to analyze a causative material qualitatively while it is analyzed quantitatively by a peak current value and a limit current value of a current/potential curve. Thus, the substance of the local corrosion reaction is clarified, thereby providing an analysis with a higher performance accuracy of measurement.

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