Use of Waste Coolant and Lubricant Concentrate for Protecting Steel from Seam Water Corrosive Action

Abstract

The component composition of lubrication and cooling fluid (LCF) concentrates is investigated. It is revealed that spent and fresh LCF mainly contain hydrocarbons and fatty acids, in particular stearic, palmitic, and oleic acid isomers that are used as emulsifiers and have the properties of steel corrosion inhibitors. Also within the concentrate of spent LCF presence of 2,6-di-tert-butyl-p-cresol (ionol) is revealed that is an antioxidant and is added to the oil composition to protect steel from corrosion. In this case a concentrate of spent cutting fluid of the Isanol VPS-2 grade, obtained by the method of membrane separation, is used as an inhibiting additive to protect steel (intended for pipeline manufacture) from the corrosive effects of seam water. As a result of corrosion tests it is determined that the degree of protection for steel 20 with a concentrate of spent LCF is 49 % (with a dosage of 800 mg/dm3), and with fresh cutting fluid concentrate it is 76 % (with dosage of 400 mg/dm3).