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4-Chloro-benzoic acid [1,2,4]triazol-1-ylmethyl ester as an effective inhibitor of mild steel corrosion in HCl solution / Z. Tao in Materials and corrosion, Vol. 61 N° 10 (Octobre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 10 (Octobre 2010) . - pp. 877–884 Titre : 4-Chloro-benzoic acid [1,2,4]triazol-1-ylmethyl ester as an effective inhibitor of mild steel corrosion in HCl solution Type de document : texte imprimé Auteurs : Z. Tao, Auteur ; S. Zhang, Auteur ; W. Li, Auteur Année de publication : 2011 Article en page(s) : pp. 877–884 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion  inhibition;  corrosion  test;  electrochemical  techniques;  electron  microscopy Résumé : 4-Chloro-benzoic acid [1,2,4]triazol-1-ylmethyl ester (CBT) was synthesized and its inhibiting action on the corrosion of mild steel in 1 M hydrochloric acid solutions was investigated by means of weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM). The results showed that CBT is an excellent inhibitor for mild steel in acid medium and its inhibition efficiency (IE%) is up to 90.2% at a concentration of 10−3 M at 298 K. EIS showed that the charge transfer controls the corrosion process in the uninhibited and inhibited solutions. Potentiodynamic polarization studies clearly reveal that CBT acts essentially as mixed-type inhibitor. Thermodynamic parameters such as adsorption heat (), adsorption entropy (), and adsorption free energy En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905291/abstract [article] 4-Chloro-benzoic acid [1,2,4]triazol-1-ylmethyl ester as an effective inhibitor of mild steel corrosion in HCl solution [texte imprimé] / Z. Tao, Auteur ; S. Zhang, Auteur ; W. Li, Auteur . - 2011 . - pp. 877–884. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 10 (Octobre 2010) . - pp. 877–884 Mots-clés : Corrosion  inhibition;  corrosion  test;  electrochemical  techniques;  electron  microscopy Résumé : 4-Chloro-benzoic acid [1,2,4]triazol-1-ylmethyl ester (CBT) was synthesized and its inhibiting action on the corrosion of mild steel in 1 M hydrochloric acid solutions was investigated by means of weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM). The results showed that CBT is an excellent inhibitor for mild steel in acid medium and its inhibition efficiency (IE%) is up to 90.2% at a concentration of 10−3 M at 298 K. EIS showed that the charge transfer controls the corrosion process in the uninhibited and inhibited solutions. Potentiodynamic polarization studies clearly reveal that CBT acts essentially as mixed-type inhibitor. Thermodynamic parameters such as adsorption heat (), adsorption entropy (), and adsorption free energy En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905291/abstract

Corrosion performance of epoxy coatings modified by nanoparticulate SiO2 / W. Li in Materials and corrosion, Vol. 63 N° 1 (Janvier 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 1 (Janvier 2012) . - pp. 44–53 Titre : Corrosion performance of epoxy coatings modified by nanoparticulate SiO2 Type de document : texte imprimé Auteurs : W. Li, Auteur ; H. Tian, Auteur ; B. Hou, Auteur Année de publication : 2012 Article en page(s) : pp. 44–53 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion  performance  Epoxy  coating  Modification  Nanoparticulate  SiO2 Résumé : Electrochemical impedance spectroscopy (EIS) was employed to investigate the corrosion performance of nanoparticulate SiO2 modified epoxy coatings on carbon steel in 3.5 wt% NaCl solution, coupled with salt spray test. Capacitance-gravimetric methods and delamination tests were performed to analyze the water uptake behavior and interface stability against delamination of modified coatings, respectively. Four systems were studied, including a clear coating and three pigmented coatings (with 1, 2, and 3 wt% nanoparticulate SiO2). The experimental results showed that nanoparticulate SiO2 particles can improve the anti-corrosion performance of the coatings and the optimal addition content is 2 wt%. The results obtained with capacitance-gravimetric measurements showed that the diffusion process of water through epoxy coatings with different pigment volume concentration (PVC) obeyed the second Fick's diffusion law in the initial period. Adding nanoparticulate SiO2 into epoxy coatings can act effectively. The positive influence is attributed to the reaction between nanoparticles and epoxy resin which is confirmed by FTIR, improving the barrier and dispersion effectiveness of coatings. The negative one is increasing the number of pores in the coatings when the adding amount is beyond the critical PVC. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905620/abstract [article] Corrosion performance of epoxy coatings modified by nanoparticulate SiO2 [texte imprimé] / W. Li, Auteur ; H. Tian, Auteur ; B. Hou, Auteur . - 2012 . - pp. 44–53. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 1 (Janvier 2012) . - pp. 44–53 Mots-clés : Corrosion  performance  Epoxy  coating  Modification  Nanoparticulate  SiO2 Résumé : Electrochemical impedance spectroscopy (EIS) was employed to investigate the corrosion performance of nanoparticulate SiO2 modified epoxy coatings on carbon steel in 3.5 wt% NaCl solution, coupled with salt spray test. Capacitance-gravimetric methods and delamination tests were performed to analyze the water uptake behavior and interface stability against delamination of modified coatings, respectively. Four systems were studied, including a clear coating and three pigmented coatings (with 1, 2, and 3 wt% nanoparticulate SiO2). The experimental results showed that nanoparticulate SiO2 particles can improve the anti-corrosion performance of the coatings and the optimal addition content is 2 wt%. The results obtained with capacitance-gravimetric measurements showed that the diffusion process of water through epoxy coatings with different pigment volume concentration (PVC) obeyed the second Fick's diffusion law in the initial period. Adding nanoparticulate SiO2 into epoxy coatings can act effectively. The positive influence is attributed to the reaction between nanoparticles and epoxy resin which is confirmed by FTIR, improving the barrier and dispersion effectiveness of coatings. The negative one is increasing the number of pores in the coatings when the adding amount is beyond the critical PVC. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905620/abstract

Experimental and quantum chemical studies on two triazole derivatives as corrosion inhibitors for mild steel in acid media / W. Li in Materials and corrosion, Vol. 62 N° 11 (Novembre 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1042–1050 Titre : Experimental and quantum chemical studies on two triazole derivatives as corrosion inhibitors for mild steel in acid media Type de document : texte imprimé Auteurs : W. Li, Auteur ; L. Hu, Auteur ; Z. Tao, Auteur Année de publication : 2012 Article en page(s) : pp. 1042–1050 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Ab  initio  calculations  Corrosion  inhibition;mild  steel  Surface  properties  Triazole  derivative Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Two triazole derivatives [1-phenyl-2-(5-(1,2,4) triazol-1-ylmethyl-(1,3,4) oxadizaol-2-ylsulphanyl)-ethanone (PTOE) and 2-(4-tert-butyl-benzylsulphanyl)-5-(1,2,4) triazol-1-ylmethyl-(1,3,4) oxadiazole (TBTO)] were synthesized as new corrosion inhibitors for the corrosion of mild steel in 1 M hydrochloric acid solutions. The inhibiting efficiency of the different inhibitors was evaluated by means of weight loss and electrochemical techniques such as electrochemical impedance spectroscopy (EIS) and polarization curves. The electrochemical investigation results indicate that these compounds act as mixed-type inhibitors retarding the anodic and cathodic corrosion reactions and do not change the mechanism of either hydrogen evolution reaction or mild steel dissolution. The studied compounds followed the Langmuir adsorption isotherm, and the thermodynamic parameters were determined and discussed. The effect of molecular structure on the inhibition efficiency has been investigated with ab initio calculations. The electronic properties such as highest occupied molecular orbital (HOMO) energy level, lowest unoccupied molecular orbital (LUMO) energy level, dipole moment (µ) and molecular orbital densities were calculated. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005965/abstract [article] Experimental and quantum chemical studies on two triazole derivatives as corrosion inhibitors for mild steel in acid media [texte imprimé] / W. Li, Auteur ; L. Hu, Auteur ; Z. Tao, Auteur . - 2012 . - pp. 1042–1050. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 1042–1050 Mots-clés : Ab  initio  calculations  Corrosion  inhibition;mild  steel  Surface  properties  Triazole  derivative Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Two triazole derivatives [1-phenyl-2-(5-(1,2,4) triazol-1-ylmethyl-(1,3,4) oxadizaol-2-ylsulphanyl)-ethanone (PTOE) and 2-(4-tert-butyl-benzylsulphanyl)-5-(1,2,4) triazol-1-ylmethyl-(1,3,4) oxadiazole (TBTO)] were synthesized as new corrosion inhibitors for the corrosion of mild steel in 1 M hydrochloric acid solutions. The inhibiting efficiency of the different inhibitors was evaluated by means of weight loss and electrochemical techniques such as electrochemical impedance spectroscopy (EIS) and polarization curves. The electrochemical investigation results indicate that these compounds act as mixed-type inhibitors retarding the anodic and cathodic corrosion reactions and do not change the mechanism of either hydrogen evolution reaction or mild steel dissolution. The studied compounds followed the Langmuir adsorption isotherm, and the thermodynamic parameters were determined and discussed. The effect of molecular structure on the inhibition efficiency has been investigated with ab initio calculations. The electronic properties such as highest occupied molecular orbital (HOMO) energy level, lowest unoccupied molecular orbital (LUMO) energy level, dipole moment (µ) and molecular orbital densities were calculated. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005965/abstract

Research on coating deterioration process under fully immersing condition by using multi-parameters / X. Zhao in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 431–435 Titre : Research on coating deterioration process under fully immersing condition by using multi-parameters Type de document : texte imprimé Auteurs : X. Zhao, Auteur ; J. Wang, Auteur ; W. Li, Auteur Année de publication : 2011 Article en page(s) : pp. 431–435 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Changing  rate  of  impedance  Deterioration  process  EIS Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : In this paper, a parameter, named as the changing rate of impedance (CRI) derived from electrochemical impedance spectroscopy (EIS) data was selected. The deterioration process of organic coating was investigated by analyzing this parameter using neural network toolbox. In addition, four parameters characterizing the coating state were fitted by appropriate equivalent circuits (ECs). Integrating all the results of CRI and the evaluation of fitted parameters, it can be deduced that three stages were presented in the entire coating deterioration process, which separately represented the process of water penetration, corrosion acceleration, and coating deterioration. Furthermore, CRI was proved to be a credible parameter to depict coating state in its entire deterioration process. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905496/abstract [article] Research on coating deterioration process under fully immersing condition by using multi-parameters [texte imprimé] / X. Zhao, Auteur ; J. Wang, Auteur ; W. Li, Auteur . - 2011 . - pp. 431–435. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 431–435 Mots-clés : Changing  rate  of  impedance  Deterioration  process  EIS Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : In this paper, a parameter, named as the changing rate of impedance (CRI) derived from electrochemical impedance spectroscopy (EIS) data was selected. The deterioration process of organic coating was investigated by analyzing this parameter using neural network toolbox. In addition, four parameters characterizing the coating state were fitted by appropriate equivalent circuits (ECs). Integrating all the results of CRI and the evaluation of fitted parameters, it can be deduced that three stages were presented in the entire coating deterioration process, which separately represented the process of water penetration, corrosion acceleration, and coating deterioration. Furthermore, CRI was proved to be a credible parameter to depict coating state in its entire deterioration process. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905496/abstract