It is the hydrochloric acid sulfuric acid solution where the darkening treatment item null tellurium dioxide which uses metal darkening treatment manner and the particular metal darkening treatment manner which use the metal

摘要

PROBLEM TO BE SOLVED: To provide a metal blackening liquid which can easily form a blackened layer having antireflective properties on a metal surface in a short period of time; a treatment method for blackening a metal by using the metal blackening liquid; and a product which has been blackened by using the treatment method for blackening the metal and has the blackened layer excellent in adhesiveness formed thereon.;SOLUTION: The metal blackening liquid is a hydrochloric acid solution containing tellurium dissolved therein, and includes 0.01 to 0.45 wt.% of tellurium by concentration (in terms of oxide) and 0.05 to 8 wt.% of hydrochloric acid by concentration.;COPYRIGHT: (C)2008,JPO&INPIT