SBIR-STTR Award

The objective of the proposed program is to prepare and evaluate a series of oxidation, corrosion, and wear-inhibiting additives for ctfe fluids effective at >275f. The candidate additives are mono- and diphospha-s-triazines substituted on the phosphorus atoms by phenyl and/or thio-groups and by perfluoroalkyl or perfluoroalkylether groups on the carbon ring atoms. The materials containing phenyl-substituted phosphorus ring atoms were shown to be effective anti-corrosion and anti-oxidation agents in perfluoroalkylether fluids; the presence of perfluoroalkyl or perfluoroalkylether chains is believed to assure solubility in ctfe. Additive-ctfe fluid formulations will be evaluated using selected metals and alloys in a micro-oxidation-corrosion test assembly, as well as "dip-coated" metal specimens exposed to a 100% humidity environment at 158f. Selected formulations will furthermore be subjected to 4-ball wear tests to evaluate the lubricity and film forming characteristics of the developed additives. Based on the test results, optimum additives will be developed.

The objective of the proposed program is to develop improved performance, thermal oxidative stability up to 400 degrees f, corrosion, oxidation, and wear-inhibiting additives for CTFE fluids based on the concepts established under Phase I efforts. The candidate additives are phosphastriazines, perfluoroalkyl groups containing phosphazenes, perfluoroalkyl-substituted aromatic sulfonic acid salts, perfluoroalkyl sulfonate salts, perfluoroalkyl-substituted aromatic carboxylic acid salts, and perfluorinated acid salts. The additives will be evaluated in different CTFE fluids alone and in combination to determine the presence of synergistic and complimentary action. The screening test procedures to be used are modified CREP, humidity chamber, micro-oxidation corrosion, and 4-ball wear test. Of all candidates, 20-40 g samples will be synthesized; of the five most promising, up to 200 g; of the two best, up to 3 lbs. Another objective of the program is to optimize and scale-up the synthesis processes so as to be amenable to pilot plant operations by industrial concerns under Phase III.