Accession Number:

AD0731789

Title:

Oxidation of Mercaptobenzothiazole to Benzothiazyl Disulfide in Coolant Media

Descriptive Note:

Final rept.

Corporate Author:

COATING AND CHEMICAL LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1971-09-01

Pagination or Media Count:

42.0

Abstract:

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.

Subject Categories:

  • Miscellaneous Materials
  • Reciprocating and Rotating Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE