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Wednesday, March 19, 2008 - 9:30 AM
Convention Center, Second Level, R05 (Ernest N. Morial Convention Center)
08378
Corrosion Performance of a Bio-Based Glycol for Process Cooling Applications
A bio-based 1,3-propanediol (BioPDO) product derived from corn sugar by bioprocess has been considered as a green alternative to regular petroleum-derived glycol products e.g., propylene glycol (PG), for heat transfer fluid and antifreeze applications. Electrochemical and glassware immersion (ASTM D1384) corrosion tests were performed to evaluate corrosion performance of various metals in the BioPDO aqueous (50%) solutions, uninhibited and inhibited with addition of a phosphate based corrosion inhibitor. The results showed that the corrosion performances of the uninhibited and inhibited BioPDO solutions were very similar and comparative to those of PG solutions formulated and tested at the same conditions. That is, both the inhibited BioPDO and PG solutions displayed excellent corrosion performances for all the metals tested, and yet both the uninhibited BioPDO and PG solutions were corrosive to ferrous metals and some nonferrous metals. The glassware immersion testing method was considered better than electrochemical testing method for evaluation of the effectiveness of the corrosion inhibitor over a long appearance period.