Methods and compositions for reducing stress corrosion cracking

摘要

Compositions and methods for reducing stress corrosion cracking in steel vessels used for storing and/or transporting ethanol-containing fluids. Additives including oxygen scavengers and film-forming additives can be employed together in such ethanol-containing fluids (e.g., fuel grade ethanol) to mitigate stress corrosion cracking in steel vessels, such as pipelines, storage tanks, rail cars, and/or tanker trucks.

主权项

1. A method for reducing stress corrosion cracking in a steel vessel used for storing and/or transporting fuel grade ethanol, said method comprising: pretreating said steel vessel by introducing an oxygen scavenger and a film-forming additive into said steel vessel either concurrently or sequentially with said fuel grade ethanol in a combined concentration of 500 parts per million by weight (“ppmw”) based on the weight of said fuel grade ethanol, thereby forming a pretreated vessel;
wherein said oxygen scavenger is selected from the group consisting of carbohydrazide, N,N′-diethylhydroxylamine, ascorbic acid, and mixtures thereof, and wherein said film-forming additive is diisopropanol amine.