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Ageing of Quenching Oil
Author(s): 
Pages: 40-46,47
Year: Issue:  4
Journal: Heat Treatment

Keyword:  quenching oilageingoxidizingcooling characteristics;
Abstract: Quenching oil would experience an ageing problem in service. The ageing of quenching oil is substantially an oxidizing process,and the ageing mechanism lies in initiation,propagation,branching and termination of free radical.The related tests reveal that a criterion of quenching oil aging is its total acid value up to 1 .0~1 .5 mgKOH/g.Variations in cooling characteristics of quenching oil resulting from the ageing are as follows:decrease in the vapor film stage,increase in the maximum cooling speed,moving of the cooling curve right and up, as a result,and a change of the cooling power for the worse.The oxidation resistance of quenching oil can be effectively increased by using hydrogenated base oil or composite antioxidant.To improve ageing resistance of quenching oil,matters needing attention in the application of quenching oil are:to leave the oil in circulating state, to filter the oil promptly,to keep water out the oil,don’t change the oil partially,to reduce operating temperature of the oil as much as possible,to decrease pollutant in the oil,etc.
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