Patent ID: 8883073
Filing Date: 2014-11-11
Classification: C02F,C23C,C23F

Abstract:
1. A method of inhibiting corrosion on a galvanized metal surface wherein the galvanized metal surface is part of an industrial water system that is at least partially full of water, the method comprising: (a) adjusting the water in the industrial water system to have a pH from about 6.5 to about 8.2; (b) introducing an effective amount of a corrosion-inhibiting composition into the water of the industrial water system when said system is either under load or not under load, said corrosion-inhibiting composition including a sulfide-based white rust corrosion-inhibiting compound selected from the group consisting of bismuthiols and dimerized bismuthiols; (c) circulating the water of the industrial water system for a time interval to contact the sulfide-based white rust corrosion-inhibiting compound with the galvanized metal surface to form a barrier on the galvanized metal surface, if the system was not under load; (d) operating the system for a time interval to contact the corrosion-inhibiting composition with the galvanized metal surface to form a barrier on the galvanized metal surface, if the system was under load; (e) overlaying the barrier by: (f) operating the industrial water system under load for one or more additional time intervals and repeating step (e) after one or more of the additional time intervals.