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Influence of Powder Size of the Vapor Corrosion Inhibitor on Inhibiting Effectiveness

Protection effectiveness of commercially available vapor corrosion inhibitors powders with different particle size was evaluated. Conventional powder size of and nano-particle powder inhibiting effectiveness was compared using the vapor-inhibiting ability (VIA) NACE TM 208.

Product Number: 51317--8851-SG
ISBN: 8851 2017 CP
Author: Behzad Bavarian
Publication Date: 2017
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The protection effectiveness of commercially available vapor corrosion inhibitors powders with different particle size was evaluated. Conventional powder size of and nano-particle powder inhibiting effectiveness was compared using the vapor-inhibiting ability (VIA) NACE TM 208† . Optical microscopy post VIA corrosion tests revealed that the particle size of inhibitor powder has a significant influence on the degree of protection. The nano-particle inhibitor showed a corrosion rating grade 4 and more than 41% decrease on the corrosion rate both in electrochemical tests and continuous exposure tests compared with the inhibitor with coarse particle size inhibitor. Surface coverage also showed improvement mainly due to increase of effective surface area and the partial pressure of vapor inhibitors as powder particle size decreased. Adsorption energy was roughly -16,740 J/mol for the nano-particle size inhibitor, while, adsorption energy is roughly -13,660 J/mol for the coarse-particle size inhibitor, indicative of a stronger physical adsorption to the metal surface for nano-particle than the coarse inhibitor, leading to better corrosion protection. Laser Doppler Anemometry (LDA) measurement using the Doppler shift in a laser beam to measure the flow velocity showed a velocity of 6 ft/sec for nano-particle and uniform flow. While coarse particle inhibitor had a lower velocity of 3-4 ft/sec and non-uniform flow.
Key words: corrosion inhibitor, vapor corrosion inhibitor, nanoparticles, localized corrosion, adhesion model, Laser Doppler Anemometry

The protection effectiveness of commercially available vapor corrosion inhibitors powders with different particle size was evaluated. Conventional powder size of and nano-particle powder inhibiting effectiveness was compared using the vapor-inhibiting ability (VIA) NACE TM 208† . Optical microscopy post VIA corrosion tests revealed that the particle size of inhibitor powder has a significant influence on the degree of protection. The nano-particle inhibitor showed a corrosion rating grade 4 and more than 41% decrease on the corrosion rate both in electrochemical tests and continuous exposure tests compared with the inhibitor with coarse particle size inhibitor. Surface coverage also showed improvement mainly due to increase of effective surface area and the partial pressure of vapor inhibitors as powder particle size decreased. Adsorption energy was roughly -16,740 J/mol for the nano-particle size inhibitor, while, adsorption energy is roughly -13,660 J/mol for the coarse-particle size inhibitor, indicative of a stronger physical adsorption to the metal surface for nano-particle than the coarse inhibitor, leading to better corrosion protection. Laser Doppler Anemometry (LDA) measurement using the Doppler shift in a laser beam to measure the flow velocity showed a velocity of 6 ft/sec for nano-particle and uniform flow. While coarse particle inhibitor had a lower velocity of 3-4 ft/sec and non-uniform flow.
Key words: corrosion inhibitor, vapor corrosion inhibitor, nanoparticles, localized corrosion, adhesion model, Laser Doppler Anemometry

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