Permelec Electrode Ltd.

Almex Inc.

Kazuhiro Hirao

Takayuki Shimamune

Hiroshi Asano

Ryuta Hirayama

Kenichi Ueno

Yoshinori Nishiki

Yukiei Matsumoto

Takanobu Hayashi

Genzo Yamane

Hitoshi Usuda

Ryoei Yamakawa

A method of copper-plating a material whereby electrolysis is performed using an electrolytic plating cell including a diaphragm which separates an anode chamber having therein an insoluble metal electrode as an anode from a cathode chamber having therein the material to be plated as a cathode, and further using an electrolyte solution containing copper ions and an additive, wherein the electrolyte is fed to the cathode chamber in a manner such that the copper ion concentration in the electrolyte within the cathode chamber is kept constant and electrolyte is further fed to the anode chamber at a rate of from about 0.2 to 11 ml/KAh.

Method of copper plating

According to the present invention, an upper electrode and a lower electrode are integrally assembled with insoluble electrodes and diaphragmn in diaphragm electrode structure. Small holes are furnished on the upper electrode, and the diaphragm of the upper electrode is installed obliquely with degassing means. By simply carrying the objects to be plated in horizontal direction, uniform and high quality electroplating can be continuously performed with extensive increase in productivity, while enjoying all of the benefits such as shorter interpolar distance between two electrodes, compact design of the apparatus, saving of expensive additives, etc. Further, the inspection of the diaphragm and the like can be rapidly and easily accomplished, and perfect protection of the diaphragm is assured, thus providing a horizontal carrying type electroplating apparatus suitable for practical use.

Horizontal carrying tape electroplating apparatus

An electrode for use in electrolysis is disclosed, which comprises a metallic substrate having formed on the surfaces thereof, in sequence, an amorphous layer free of grain boundaries, and an active electrode material coating. The electrode shows excellent durability even when used in electrolysis accompanied by oxygen evolution. A process for producing the electrode is also disclosed.

Durable electrode for use in electrolysis and process for producing the

A method of electrolytically treating metals with an a.c. current or alternating pulsive current using an electrode comprising a metal substrate having a coating that comprises an oxide of ruthenium, iridium or rhodium as a counter electrode.

Method of electrolytic treatment of metals

An electrolytic electrode which exhibits high durability when used in electrochemical processes in which the generation of oxygen is involved and a process for the production of the same. The electrolytic electrode comprises

Durable electrode for electrolysis and process for production thereof

A method for electrolyzing a dilute caustic alkali aqueous solution in an electrolytic cell partitioned by a cation exchange membrane using iron, nickel or their base alloys as an electrode, and an apparatus thereof whereby the polarities of the electrodes are periodically reversed.

Method for electrolyzing dilute caustic alkali aqueous solution by

An electrode comprising a substrate of a conducting metal, a coat of an electrode active substrate, and a layer interposed between the substrate and the coat to serve as a protective barrier for the substrate acquires improved durability by using, as the intermediate layer, a layer having platinum dispersed in a mixed oxide consisting of an oxide of at least one metal selected from the group consisting of titanium and tin, each having a valence of 4, and an oxide of at least one metal selected from the group consisting of tantalum and niobium, each having a valence of 5. The electrode of improved durability is produced by a process which comprises the steps of preparing a substrate of a conducting metal, depositing a solution containing salts of Ti and/or Sn, Ta and/or Nb, and Pt on the substrate, heating the resultant coated substrate under the blanket of an oxidizing gas thereby forming an intermediate layer on the substrate, and subsequently coating the intermediate layer with a layer of an electrode active substance.

A process for the production of electrolytic ion exchange membranes with a coating, comprising coarsening the surface of an ion exchange membrane by an ion-etching treatment and, thereafter, coating the coarsened surface with a substance with a low electrochemical activity. The use of these ion exchange membranes greatly reduces the electrolytic voltage while maintaining a high current efficiency, and enables electrolysis to be performed in a stable manner over a long period of time.

Growing community of inventors

Kanagawa, Japan

Kazuhiro Hirao