Oblon, Spivak, McClelland, Maier & Neustadt
Brightening chemical polishing solution for hardened steel article
 A brightening chemical polishing solution for a hardened steel article (e.g., a carburized and quenched gear) comprises hydrofluoric acid having a molar concentration of from 0.2 to 2 mol/l, hydrogen peroxide having a molar concentration of from 0.4 to 4 mol/l, and water, a molar ratio of the hydrofluoric acid to the hydrogen peroxide being from 1:1.5 to 1:2.8. The steel article is quench hardened and is chemically polished in the solution. A shot-peening is additionally performed, prior to the polishing. 
Kabushiki Kaisha Toyota Chuo Kenkyusho Toyota Jidosha Kabushiki Kaisha
C
C23F
inventional
Masazumu Fumio Mineo Yasuyuki Kenichi Masaki Hideo Takashi Kazuyoshi
Onishi Shimizu Ogino Suzuki Suzuki Kajino Aihara Asano Ogawa