Materials Performance Supplements

CORTEC 2017

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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VAPOR PHASE CORROSION INHIBITORS ticle inhibitor had a lower velocity of 3 to 4 ft/s and nonuniform flow. References 1. B.A. Miksic, Preservation, Lay-up and Moth- balling Handbook, 3rd ed . (St. Paul , MN : Cortec Corp., 2014). 2. M. Kharshan, C. Cracauer, "Applications for Biodegradable Vapor Phase Corrosion Inhib- itors," MP 50, 3 (2011). 3. B.A. Miksic, M. Kharshan, R . Camp, " Wa- ter-Based Coatings Powered by Nanoparticle Vapor Corrosion Inhibitors," MP 54, 6 (2015). 4. B.A. Miksic, R.H. Miller, "Fundamental Prin- cipals of Corrosion Protection with Vapor Phase Inhibitors," 5th European Symposium on Corrosion Inhibitors, Italy, 1980. 5. J. Holden, A. Hansen, A. Furman, R. Kharshan, E. Austin, " Vapor Corrosion inhibitors in Hy- dro-testing and Long Term Storage Applica- tions," CORROSION 2010, paper no. 10405 (Houston, TX: NACE International, 2010). 6. Z. Li, C. Zhang, J. Zhu, "Numerical Study of the Effect of Particle Size on the Coating Effi- ciency and Uniformity of an Electrostatic Powder Coating Process," The Canadian J. of Chemical Engineering 83, 10 (2005). 7. L. Czepirski, M.R . Balys, E. Komorowska- Czepirska, "Some Generalization of Lang- muir Adsorption Isotherm ," Internet J. of Chemistry 14, 3 (2000). 8. M. Lagrenée, B. Mernari, M. Bouanis, M. Trais- nel, F. Bentiss, "Study of the Mechanism and Inhibiting Efficiency of 3,5-bis(4-methylthio- phenyl)-4H-1,2,4-triazole on Mild Steel Corro- sion in Acidic Media," Corr. Sci. 44, 3 (2002). 9. B. Bavarian, Y. Ikder, B. Samimi, L. Reiner, B.A. Miksic, "Implementation of Vapor Cor- rosion Inhibitors to Improve Corrosion Pro- tection Effectiveness of Dry Air System," Eu- rocorr 2015, Graz, Austria, Sept. 2015. 10. B. Bavarian, L. Reiner, H. Youssefpour, "Vapor Phase Inhibitors to Extend the Life of Aging Aircraft," CORROSION 2005, paper no. 05329 (Houston, TX: NACE 2005). 11. A. Trunschke, Surface Area and Pore Size De- termination ; Modern Methods in Heteroge- neous Catalysis Research (2007). 12. NACE TM0208-2013, "Standard Test Method L aborator y Test to Evaluat e th e Vapor - Inhibiting Ability of Volatile Corrosion Inhib- itor Materials for Temporary Protection of FIGURE 9 SEM micrographs of steel sample after VIA tests. Superior performance for VCI-A nano exposed samples. The black dots on the VCI-A nano samples are mainly alloy inclusions. FIGURE 10 Comparison of corrosion behavior of UNS G10180 steel, continuous exposure (120 days above mist sand corrosion tests, 200 ppm Cl- solution added to sand bed every 72 h). Conclusions The effectiveness of commercially avail- able VCI powders with different particle size was evaluated. Conventional powder size and nanoparticle powder inhibiting effec- tiveness was compared. Optical micros- copy post VIA corrosion tests revealed that the particle size of inhibitor powder has a significant influence on the degree of pro- tection. The nanoparticle inhibitor showed a corrosion rating of Grade 4 and >41% decrease on the corrosion rate. Surface cov- erage also appeared to improve, mainly due to the increase of effective surface area and the partial pressure of VCIs as powder par- ticle size is reduced. Adsorption energy was roughly –16,740 J/mol for the nanoparticle size inhibitor, while adsorption energy was roughly –13,660 J/mol for the coarse-par- ticle-size inhibitor, indicative of a strong physical adsorption to the metal surface for both inhibitors. But VCI-A-Nano showed a stronger interaction with the steel surface than the coarse inhibitor, leading to better corrosion protection. Continuous expo- sure in mist sand corrosion tests verified the corrosion rate reduction by a factor of 10. The laser Doppler anemometry mea- surement using the Doppler shift in a laser beam to measure the flow velocity showed a velocity of 6 ft/s for the nanoparticle inhibi- tor and uniform flow, while the coarse-par- 8 JUNE 2017 MATERIALS PERFORMANCE CORTEC SUPPLEMENT TO MP 8 JUNE 2017 MATERIALS PERFORMANCE CORTEC SUPPLEMENT TO MP

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