Abstract
Corrosion inhibition of stainless steel (type 304, (UNS S30400)) and mild steel (SS 41 (UNS K02600)) in the CO 2 absorption process was investigated by corrosion tests and physicochemical measurements in an aqueous potassium carbonate solution containing 1-(hydroxyethylidene)-1,1-diphosphonic acid (HEDP). The maximum value of the inhibition efficiency (η) of corrosion for SS 41 was ca. 80% in the test solution containing 200 ppm of HEDP under air atmosphere by the corrosion weight loss test and approached those values obtained in the test solutions with Na 2 CrO 4 (>99%) and V 2 O 5 (>99%). The corrosion rate result obtained with the corrosion weight loss test corresponded to that obtained with electrochemical measurements. By scanning tunneling microscopy (STM), the molecules of HEDP were adsorbed on the surface of SS 41 to inhibit its corrosion. In the application test, using a Benfield apparatus as a bench-scale system, the η value for type 304 was ca. 80-90% in the test solution containing HEDP at high pressure and temperature. The HEDP also depressed the formation of scale as well as depressed the result in the water-cooling process
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