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Anti-tarnish treatment of brass for coinage (II) color analysis, adsorption model, and quantum chemical calculations / C. Liang in Materials and corrosion, Vol. 62 N° 1 (Janvier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 53–60 Titre : Anti-tarnish treatment of brass for coinage (II) color analysis, adsorption model, and quantum chemical calculations Type de document : texte imprimé Auteurs : C. Liang, Auteur ; P. Wang, Auteur ; B. Wu, Auteur Année de publication : 2011 Article en page(s) : pp. 53–60 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : adsorption  model  Brass  EIS  Quantum  chemical  calculation Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The color and gloss of brass before and after anti-tarnish treatment were analyzed with color difference meter, and the inhibition effect of 1-phenyl-5-mercapto-tetrazole (PMTA) film on brass was investigated by means of electrochemical impedance spectroscopy (EIS). It was found that the treatment with PMTA brought few changes to the original color and gloss of brass. The adsorption of PMTA on brass surface obeyed Langmuir adsorption isotherm, it was a spontaneous and exothermic process accompanied by an increase in entropy. Further, quantum chemical calculation was applied to elucidate the corrosion inhibition mechanism of PMTA on brass surface. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905482/abstract [article] Anti-tarnish treatment of brass for coinage (II) color analysis, adsorption model, and quantum chemical calculations [texte imprimé] / C. Liang, Auteur ; P. Wang, Auteur ; B. Wu, Auteur . - 2011 . - pp. 53–60. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 1 (Janvier 2011) . - pp. 53–60 Mots-clés : adsorption  model  Brass  EIS  Quantum  chemical  calculation Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The color and gloss of brass before and after anti-tarnish treatment were analyzed with color difference meter, and the inhibition effect of 1-phenyl-5-mercapto-tetrazole (PMTA) film on brass was investigated by means of electrochemical impedance spectroscopy (EIS). It was found that the treatment with PMTA brought few changes to the original color and gloss of brass. The adsorption of PMTA on brass surface obeyed Langmuir adsorption isotherm, it was a spontaneous and exothermic process accompanied by an increase in entropy. Further, quantum chemical calculation was applied to elucidate the corrosion inhibition mechanism of PMTA on brass surface. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905482/abstract

A study on the 65-35 brass corrosion inhibitor / C. Liang in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 350–354 Titre : A study on the 65-35 brass corrosion inhibitor Type de document : texte imprimé Auteurs : C. Liang, Auteur ; G. Gao, Auteur ; B. Wu, Auteur Année de publication : 2012 Article en page(s) : pp. 350–354 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion;  inhibitor;  brass;  potentiostatic Résumé : The influence of new inhibitor namely 1,3-bis-diethylamino-propan-2-ol (DEAP) on the dezincification corrosion of 65-35 brass in simulated atmospheric water was studied by potentiostatic current transient measurement, solution analysis and surface evaluation techniques. Potentiostatic current transient results showed that the investigated inhibitor can effectively inhibit the chemical dissolution of brass in simulated atmospheric water. Solution analysis revealed that the weigh loss of brass electrode remarkably decreased in the presence of DEAP, changing from 7.375 × 10−3 mg (blank) to 9.567 × 10−4 mg (10−2  M). The scanning electron microscope (SEM) and electron probe microanalyzer (EPMA) measurements showed that DEAP may better adsorb to zinc component than to copper component, inhibiting the dezincification of brass in solution by a mixed complex film of Zn(II)-DEAP and Cu(I)-DEAP. The nature of the inhibited film was analyzed by an X-ray photoelectron spectroscope (XPS) analyzer. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005795/abstract [article] A study on the 65-35 brass corrosion inhibitor [texte imprimé] / C. Liang, Auteur ; G. Gao, Auteur ; B. Wu, Auteur . - 2012 . - pp. 350–354. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 350–354 Mots-clés : Corrosion;  inhibitor;  brass;  potentiostatic Résumé : The influence of new inhibitor namely 1,3-bis-diethylamino-propan-2-ol (DEAP) on the dezincification corrosion of 65-35 brass in simulated atmospheric water was studied by potentiostatic current transient measurement, solution analysis and surface evaluation techniques. Potentiostatic current transient results showed that the investigated inhibitor can effectively inhibit the chemical dissolution of brass in simulated atmospheric water. Solution analysis revealed that the weigh loss of brass electrode remarkably decreased in the presence of DEAP, changing from 7.375 × 10−3 mg (blank) to 9.567 × 10−4 mg (10−2  M). The scanning electron microscope (SEM) and electron probe microanalyzer (EPMA) measurements showed that DEAP may better adsorb to zinc component than to copper component, inhibiting the dezincification of brass in solution by a mixed complex film of Zn(II)-DEAP and Cu(I)-DEAP. The nature of the inhibited film was analyzed by an X-ray photoelectron spectroscope (XPS) analyzer. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005795/abstract