BRUSHING / PASSIVATION OF METAL SURFACES WITHOUT HAZARD OF NITROGEN OXIDE EMISSIONS.

摘要

A process of brightening and passivating a stainless steel surface by contacting said surface with a brightening and passivating liquid of a composition containing water and the following dissolved components: (A) at least one acid; (B) at least one substance that contains a peroxy fraction; and (C) at least one organic substance selected from the group consisting of: where substances consisting of molecules that contain both at least one ether fraction and at least one hydroxyl fraction in each molecule; The acid component (A) comprises an acid selected from the group consisting of sulfuric, sulfurous, hydrofluoric and hydrochloric acids in a concentration of at least 5 grams of acid per liter of the total brightening and passivation liquid, and, additionally, also comprises an acid containing phosphorus in an amount of no more than 25 grams per liter of the brightener and total passivation liquid.