Increased power input on aluminum heat-transfer surfaces: The effect on the corrosion protection provided by selected engine coolants
- Texaco Inc., Beacon, NY (United States). Fuels and Lubricants Research Dept.
- Huntsman Corp., Austin, TX (United States)
Modern automotive engines require an efficient heat-dissipation at the heat-transfer surfaces in the engines. The coolant has to cope with increased engine power and consequently higher engine temperatures, while engine coolant volumes are decreasing. Heat-transfer has to be assured without compromising the other requirements for the engine coolant such as corrosion protection. A selection of ethylene glycol based engine coolants, representative of current coolant technologies, were tested in a dynamic heat-transfer test. They include a silicate based american coolant, a nitrite-containing and nitrite-free european formulation and a carboxylate based coolant. A propylene glycol based version of the carboxylate based coolant was also included in the test. The input-power into the hot coupon was varied from 38 W/cm{sup 2} to 115 W/cm{sup 2}. The effect on the corrosion protection was evaluated by weight loss measurements. Heat-transfer characteristics could be correlated to mid-section coupon temperatures. The results indicate that only the carboxylate based coolants provide corrosion protection over the whole heat-input range tested. The results also indicate that the performance by these coolants is only slightly affected by heat-input/metal temperature and that they do not impede the heat-transfer from metal to liquid.
- OSTI ID:
- 458385
- Report Number(s):
- CONF-9604188--; ISBN 0-7918-1766-0
- Country of Publication:
- United States
- Language:
- English
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