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

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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51318-11008-Impact of Wash Water Injection on Corrosion Control in a Gas Recovery Unit

Product Number: 51318-11008-SG
Author: Chloe Lins / Cesar Espinoza / Sudhakar Mahajanam / Bruce Copple / Joanna Folse / Gillian Sayegh / Melissa Meneses
Publication Date: 2018
$20.00