GE Water & Process Technologies (GE) developed a new organic based mild steel corrosion
inhibitor for use in closed recirculating cooling systems to effectively replace benchmark
Molybdate / Nitrite treatments. Laboratory data comparing the corrosion inhibition obtained
with the new product, with the benchmark, and with other organic mild steel inhibitors used for
closed cooling loops are presented. The corrosion inhibition efficacy in the laboratory was
established by standard electrochemical tests, linear polarization, and under heat transfer
conditions with an apparatus that simulates a closed loop recirculating system. In the
apparatus corrosion is monitored by: coupon weight loss measurement, corrosion rate meters,
and the visual appearance of a heat exchanger tube.
Hypothetical mechanisms by which the new product inhibits corrosion of mild steel are also
discussed.