Chuetsu Metal Works Co., Ltd.

Oiles Corporation

Kenichi Ichida

Kunio Nakashima

Wataru Yago

Atsushi Yasukawa

Takashi Nakamaru

Ryouichi Ishigane

Shigeyuki Aburatani

Sumiko Sanuki

Satoshi Takamura

Kazuo Takeuchi

A synchronizer ringhas an annular ring body; a friction materialjoined integrally to a cylindrical inner peripheral surfaceof the ring body; a conical surfaceformed on an inner surface of the friction material; and a plurality of annular groovesformed in the conical surfaceof the friction material

Synchronizer ring

A lead-containing copper-based alloy is immersed into a weak acidic or neutral etching solution having a buffer effect which is formed by adding an organic acid into a complexing agent having a high ability to form a complexing ion with lead, and lead particles present on the surface of the lead-containing copper-based alloy are then removed. The complexing agent is one of an organic ammonium salt such as ammonium acetate, or ammonium citrate, or may be an organic sodium salt such as sodium acetate, sodium tartrate, and sodium citrate. Preferably, an immersion temperature of the alloy to the etching solution falls within a range of from 10 to 50&#xb0; C. The etching solution is agitated with oxygen or a gas containing oxygen blown thereinto during the immersion of the alloy into the etching solution. An extremely low voltage of &#x2212;0.3 to +0.2 V vs. NHE is applied from outside to the lead-containing copper-based alloy as an anode.

Method for preventing lead from dissolving from a lead-containing copper-based alloy

Growing community of inventors

Tateyama-machi, Japan

Kenichi Ichida