Oxidation of Mercaptobenzothiazole to Benzothiazyl Disulfide in Coolant Media.

摘要

Higher concentrations of mercaptobenzothiazole (MBT) are required in coolants to inhibit corrosion of metals in cooling systems of higher horsepower engines against corrosion. Since thiols such as MBT are easily oxidized,the mechanism of this reaction and the contributing factors of light,oxygen,and heat are evaluated. It is demonstrated that MBT is readily oxidized to the less soluble,terminal molecule of benzothiazyl disulfide by way of free radicals,and that this conversion is irreversible in coolant media. The possibility of deleterious operational effect of this conversion is considered. (Author)