Dipsol Chemicals Co., Ltd.

Honda Motor Co., Ltd.

Konami Digital Entertainment Co., Ltd.

Threebond Co., Ltd.

Ihi Infrastructure Systems Co., Ltd.

Manabu Inoue

Tomitaka Yamamoto

Tadahiro Ohnuma

Toshiki Inomata

Katsuhide Oshima

Shigemi Tanaka

Tsutomu Miyadera

Akira Hashimoto

Go Sato

Kimitaka Watanabe

Satoshi Yuasa

Tadahiro Onuma

Mitsutada Kaneta

Keisuke Nonomura

Naruaki Konno

Yasuhiro Kato

Toshihiro Niikura

Kazuhiro Watanabe

Hiroyuki Yoshida

Hitomi Ito

Hisakazu Shimizu

Takashi Nemoto

Kenichi Horie

Hitoshi Sakurai

Ryo Nakajima

Shinsuke Mochizuki

Yoshihide Arai

Tetsuya Sekine

Yuko Nishiyama

Junko Ozawa

Ryuta Kashio

Takashi Koike

Hiroshi Hirayama

Takahiro Fujino

Toshiyasu Nagai

Takahiro Fujimori

Keita Ishizu

Motoi Nakatani

Go Nagata

Yasuhiro Arai

Toshimi Chiba

Ryouji Iwanaga

Hirofumi Shiga

Mitsuhiro Yamane

Nayomon Uno

An object is to provide a trivalent chromium chemical conversion treatment liquid for a zinc or zinc alloy base capable of forming an environmentally-friendly chemical conversion coating with high corrosion resistance. The present invention provides a hexavalent chromium-free trivalent chromium chemical conversion treatment liquid for zinc or zinc alloy, the liquid comprising trivalent chromium ions, zirconium ions, nitrate ions, and chain colloidal silica, in which the pH of the treatment liquid is 2.5 to 5.0.

Trivalent chromium chemical conversion treatment liquid for zinc or zinc alloy base and chemical conversion treatment method using the same

A trivalent-chromium chemical conversion coating from which substantially no hexavalent chromium is released. The trivalent-chromium chemical conversion coating is one formed on the surface of a zinc or zinc-alloy deposit. In a brine spray test, the chemical conversion coating has unsusceptibility to corrosion (time required for white-rust formation) of 96 hours or longer. The chemical conversion coating has a hexavalent-chromium concentration less than 0.01 &#x3bc;g/cmin terms of metal atom amount. The amount of hexavalent chromium released after 30-day standing in a thermo-hygrostatic chamber at a temperature of 80&#xb0; C. and a humidity of 95% (amount of hexavalent chromium released when the coating is immersed in 100&#xb0; C. water for 10 minutes) is smaller than 0.05 &#x3bc;g/cm.

Corrosion-resistant trivalent-chromium chemical conversion coating and solution for trivalent-chromium chemical treatment

The purpose of the present invention is to provide an electrical Al plating bath that poses little danger of exploding or igniting as a result of contacting air or water, and contains no benzene, toluene, xylene, naphthalene, or 1,3,5-trimethylbenzene, which have detrimental effects to humans. The present invention provides an electrical aluminum or aluminum alloy fused salt plating bath that is obtained by heat treatment of an electrical aluminum or aluminum alloy fused salt plating bath containing (A) a halogenated aluminum as the primary component and (B) at least one other type of halide after adding (C) one, two or more reducible compounds selected from the group consisting of hydrides of elements in Group 1 Periods 2 through 6 of the Periodic Table of Elements and/or hydrides of Group 13 Periods 2 through 6 of the Periodic Table of Elements and amine borane compounds.

Aluminum or aluminum alloy molten salt electroplating bath having good throwing power, electroplating method using the bath, and pretreatment method of the bath

Provided is a black coupling member for vehicles, comprising a trivalent chromium black chemical conversion film and a black coating film upon the trivalent chromium black chemical conversion film, on the surface of a zinc-plated metal substrate. The trivalent chromium black chemical conversion film is formed using a hexavalent chromium-free trivalent chromium black chemical conversion treatment solution having a Zn ion concentration of no more than 20 g/L. The lightness (L) of the trivalent chromium black chemical conversion film is no more than 33. The black coating film includes a black chemical conversion component, a modified organopolysiloxane, and a friction coefficient-adjustment component. The black chemical conversion component content is 2-25 wt % relative to 100 wt % of the black coating film. The lightness (L) is no more than 28.

Black coupling member for vehicles, having excellent corrosion resistance and black appearance

The present invention provides a zinc alloy electroplating method comprising applying a current through an alkaline zinc alloy electroplating bath comprising a cathode and an anode, wherein a cathode region including the cathode and an anode region including the anode are separated from each other by an anion exchange membrane, a catholyte contained in the cathode region is an alkaline zinc alloy plating liquid, and an anolyte contained in the anode region is an aqueous alkaline solution.

Zinc alloy plating method

The present invention provides a method for producing a coated stainless steel member, comprising: performing Wood's strike nickel plating on a stainless steel substrate, and then performing cationic electrodeposition on a formed Wood's strike nickel plating layer.

Coated stainless steel member

Disclosed is an electric Al&#x2014;Zr alloy plating bath containing an aluminum halide (A), one or more compounds (B) selected from the group consisting of N-alkylpyridinium halides, N-alkylimidazolium halides, N,N'-alkylimidazolium halides, N-alkylpyrazolium halides and N,N&#x2032;-alkylpyrazolium halides, and a zirconium halide (C). The molar ratio between the aluminum halide (A) and the compounds (B) is from 1:1 to 3:1. The electric Al&#x2014;Zr alloy plating bath further contains an aromatic organic solvent (D), an organic polymer (E) and one or more additives (F) selected from brightening agents.

Electric Al&#x2014;Zr alloy plating bath using room temperature molten salt bath and plating method using the same

The purpose of the present invention is to provide an electrical Al plating bath that poses little danger of exploding or igniting as a result of contacting air or water, and contains no benzene, toluene, xylene, naphthalene, or 1,3,5-trimethylbenzene, which have detrimental effects to humans. The present invention provides an electrical aluminum or aluminum alloy fused salt plating bath that is obtained by heat treatment of an electrical aluminum or aluminum alloy fused salt plating bath containing (A) a halogenated aluminum as the primary component and (B) at least one other type of halide after adding (C) one, two or more reducible compounds selected from the group consisting of hydrides of elements in GroupPeriodsthroughof the Periodic Table of Elements and/or hydrides of GroupPeriodsthroughof the Periodic Table of Elements and amine borane compounds.

The present invention provides a zinc alloy electroplating method comprising applying a current through an alkaline zinc alloy electroplating bath comprising a cathode and an anode, wherein a cathode region including the cathode and an anode region including the anode are separated from each other by a separator comprising an electrically conductive electrolyte gel.

The present invention provides a copper-nickel alloy electroplating bath which is characterized by containing (a) a copper salt and a nickel salt, (b) a metal complexing agent, (c) a plurality of conductivity-imparting salts that are different from each other, (d) a compound that is selected from the group consisting of disulfide compounds, sulfur-containing amino acids and salts of these compounds, (e) a compound that is selected from the group consisting of sulfonic acid compounds, sulfimide compounds, sulfamic acid compounds, sulfone amides and salts of these compounds, and (f) a reaction product of a glycidyl ether and a polyhydric alcohol. This copper-nickel alloy electroplating bath is also characterized by having a pH of 3-8.

Copper-nickel alloy electroplating bath and plating method

Provided is a friction modifier for a top coating agent for a hexavalent chromium-free trivalent chromium chemical conversion coating film or chromium-free chemical conversion coating film, said friction modifier including a polyoxyalkylene fatty acid ester.

Friction modifier for top coating agent for trivalent chromium chemical conversion coating film or chromium-free chemical conversion coating film, and top coating agent including same

The purpose of the present invention is to provide a water-soluble finishing agent for a trivalent chromium chemical conversion coating film, which has low insulation, no problems with tightening properties, outstanding gloss and high corrosion resistance, and can obtain a trivalent chromium chemical conversion coating film, especially a black trivalent chromium chemical conversion coating film, having few scratches and flaws. The finishing agent for a trivalent chromium chemical conversion coating film is characterized by containing a trivalent chromium source, a phosphate ion source, a zinc ion source, a chelating agent which can form a complex with trivalent chromium, and a non-ionic water-soluble polymer compound selected from a group comprising poly(vinyl alcohol) and derivatives thereof, poly(vinyl pyrrolidone) and derivatives thereof, poly(alkylene glycol)s and derivatives thereof, and cellulose ethers and derivatives thereof.

Finishing agent for trivalent chromium chemical conversion coating film, and method for finishing black trivalent chromium chemical conversion coating film

A treating solution for forming on a surface of either zinc or a zinc alloy a hexavalent-chromium-free trivalent-chromium chemical conversion coating which has an even black appearance and satisfactory corrosion resistance. The treating solution has a long treating-bath life. Also provided is a method of forming a black trivalent-chromium chemical conversion coating. The aqueous treating solution, which is for forming a black trivalent-chromium chemical conversion coating on zinc or a zinc alloy, contains trivalent chromium ions, a phosphoric ester and/or phosphorous ester, and a sulfur compound. The method is a method of chemically treating zinc or a zinc alloy which comprises using the aqueous treating solution to chemically treat the zinc or zinc alloy at a solution temperature of 10-60&#xb0; C., whereby a black trivalent-chromium chemical conversion coating is formed on the zinc or zinc alloy. Furthermore provided is a coated zinc or zinc alloy metal which comprises zinc or a zinc alloy and, formed thereon, a black trivalent-chromium chemical conversion coating formed by a chemical treatment with the aqueous treating solution.

Aqueous treating solution for forming black trivalent-chromium chemical conversion coating on zinc or zinc alloy and method of forming black trivalent-chromium chemical conversion coating

It is an object of the present invention to provide a processing solution used for forming a hexavalent chromium free, black conversion film, which is applied onto the surface of zinc or zinc alloy plating layers, and which has corrosion resistance identical to or higher than that achieved by the conventional hexavalent chromium-containing conversion film.

Processing solution for forming hexavalent chromium free, black conversion film on zinc or zinc alloy plating layers, and method for forming hexavalent chromium free, black conversion film on zinc or zinc alloy plating layers

To provide a barrel electroplating method which is less prone to bare spots and adhesion failure such as blisters and peeling, and which makes it possible to obtain uniform plated coatings free from burnt deposits and poor brightness, irrespective of the amount of workpieces. The present invention provides a method for performing barrel electroplating by use of an aluminum or aluminum alloy plating bath, the method comprising rotating, swinging, or vibrating an anode () placed inside a barrel () receiving workpieces, and simultaneously rotating, swinging, or vibrating the barrel, with a voltage being applied between the anode and a cathode provided on an inner wall surface of the barrel.

Aluminum or aluminum alloy barrel electroplating method

Growing community of inventors

Tokyo, Japan

Manabu Inoue