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Development of a New Vapor Phase Corrosion Inhibitor for Steam Generating and Boilers

The presence of dissolved oxygen in boiler feed water and steam generating systems can present serious problems in a steam generating plant by promoting corrosion and thick scale formation in the feed water system the boiler and the steam condensate system. Therefore it is important to remove oxygen from the feed water and also from the condensate where in-leakage can occur. The first step in the elimination of oxygen from the boiler feed water is mechanical deaeration. The second step involves chemical oxygen scavenging to remove the residual oxygen. Hydrazine is used as an oxygen scavenger to control corrosion in steam generating systems despite being a genotoxic carcinogen. Alternative chemicals nontoxic corrosion inhibitors or new oxygen scavenger-free water treatment technologies are preferred. A newly developed amine based vapor phase corrosion inhibitor was investigated. Electrochemical tests were conducted and showed a significantly lower corrosion rate in boiling water. Short term corrosion tests in boiling water showed a decreased corrosion rate from 5.3 mpy to 1.93 mpy for 50 ppm VCI and 1.32 mpy for 100 ppm VCI addition. Long term corrosion tests in the hot steam generating closed loop system showed a decreased corrosion rate from 8.2-8.9 mpy for the control sample to 0.72-0.74 mpy when washed with 500 ppm VCI solution and subsequently maintained at 100 ppm inhibitor for the test remainder. When inhibitor added at beginning of test resulted in corrosion rate of 1.09-1.24 mpy (with 100 ppm VCI). XPS analysis showed that the amine based inhibitor promoted and stabilized a protective (Fe3O4) magnetite oxide on the pipe internals.

Product Number: 51319-12773-SG
Author: Behzad Bavarian
Publication Date: 2019
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