Dipsol Chemicals Co., Ltd.

Honda Motor Co., Ltd.

Yasuhiro Kato

Manabu Inoue

Toshiki Inomata

Hiroyuki Yoshida

Shinsuke Mochizuki

Toshiyasu Nagai

Hiroshi Hirayama

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

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

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Funabashi, Japan

Yasuhiro Kato