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51318-11012-Amine base Vapor Phase Corrosion inhibitor Alternatives to Hydrazine for Steam generating system and

Picture for Amine base Vapor Phase Corrosion inhibitor Alternatives to Hydrazine for Steam generating system and Powwr Plants
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Hydrazine is used as an oxygen scavenger to control corrosion in steam generating systems, despite being a genotoxic carcinogen. This investigation confirmed an Amine Base Vapor Phase Corrosion Inhibitor can be an effective replacement for toxic hydrazine.

Product Number: 51318-11012-SG
Author: Behzad Bavarian / Lisa Reiner / James Holden / Boris Miksic
Publication Date: 2018
Industry: Process Industries
$0.00
$20.00
$20.00

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 steam generating boilers and boiling water. Short term (720 hours) corrosion tests in boiling water showed a decreased corrosion rate from 5.3 mpy to 1.93 mpy for 50 mg/L VCI and 1.32 mpy (0.001 metal loss per year) for 100 mg/L VCI (Volatile Corrosion Inhibitor) addition. Long term (2,200 hour) 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 mg/L VCI solution. The closed loop system was subsequently maintained at 100 mg/L inhibitor for the test remainder. Inhibitor added at beginning of test resulted in corrosion rate of 1.09-1.24 mpy (with 100 mg/L VCI). XPS (X-Ray Photoelectron Spectroscopy) analysis showed that the amine based inhibitor promoted and stabilized a protective (Fe3O4) magnetite oxide on the pipe internals. This investigation confirmed the inhibitor can be an effective replacement for toxic hydrazine.

Keywords: corrosion inhibitor, hydrazine, steam generating closed loop system, boilers

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 steam generating boilers and boiling water. Short term (720 hours) corrosion tests in boiling water showed a decreased corrosion rate from 5.3 mpy to 1.93 mpy for 50 mg/L VCI and 1.32 mpy (0.001 metal loss per year) for 100 mg/L VCI (Volatile Corrosion Inhibitor) addition. Long term (2,200 hour) 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 mg/L VCI solution. The closed loop system was subsequently maintained at 100 mg/L inhibitor for the test remainder. Inhibitor added at beginning of test resulted in corrosion rate of 1.09-1.24 mpy (with 100 mg/L VCI). XPS (X-Ray Photoelectron Spectroscopy) analysis showed that the amine based inhibitor promoted and stabilized a protective (Fe3O4) magnetite oxide on the pipe internals. This investigation confirmed the inhibitor can be an effective replacement for toxic hydrazine.

Keywords: corrosion inhibitor, hydrazine, steam generating closed loop system, boilers

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Author: Behzad Bavarian / Akinbosede Oluwaseye / Lisa Reiner / Jessica Meyer
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