Brightening Chemical Polishing Solution for Harened Steel Article

Author:  Suzuki et al.
Source:  US Patent 5,256,316
Doc ID:  1991101
Year of Publication:  1991
Abstract:  
A brightening chemical polishing solution for 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, 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.