The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
R. Romagnoli - One of the best experts on this subject based on the ideXlab platform.
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Lanthanum Derivative from “Tara” Tannin for Steel Temporary Protection
Industrial & Engineering Chemistry Research, 2018Co-Authors: Oriana D'alessandro, Cecilia Deyá, Alejandro R. Di Sarli, Gonzalo Julián Selmi, R. RomagnoliAbstract:Tannins are extracted from certain plants and contain numerous phenol groups. They may be employed, together with their derivatives, to formulate protective coatings due to their inhibitive properties. The objective of this research was to synthesize lanthanum “Tannates”, to formulate wash-primers. Two “Tara” (Caesalpinia spinosa) tannins and 0.1 M La(NO3)3 were employed to obtain the corresponding Tannates. The inhibitive action of the Tannates was evaluated by linear polarization and corrosion potential measurements employing a SAE 1010 electrode. Lanthanum Tannates were used to formulate wash-primers whose anticorrosion performance was evaluated by corrosion potential and ionic resistance measurements. The primers were incorporated in alkyd paint systems and their anticorrosion performance was tested in the salt spray chamber and by electrochemical impedance spectroscopy. Lanthanum Tannate primers protected steel and behaved in a similar way to that formulated with zinc tetroxychromate.
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Lanthanum Derivative from “Tara” Tannin for Steel Temporary Protection
2018Co-Authors: Oriana D’alessandro, Alejandro R. Di Sarli, Gonzalo Julián Selmi, Cecilia Deyá, R. RomagnoliAbstract:Tannins are extracted from certain plants and contain numerous phenol groups. They may be employed, together with their derivatives, to formulate protective coatings due to their inhibitive properties. The objective of this research was to synthesize lanthanum “Tannates”, to formulate wash-primers. Two “Tara” (Caesalpinia spinosa) tannins and 0.1 M La(NO3)3 were employed to obtain the corresponding Tannates. The inhibitive action of the Tannates was evaluated by linear polarization and corrosion potential measurements employing a SAE 1010 electrode. Lanthanum Tannates were used to formulate wash-primers whose anticorrosion performance was evaluated by corrosion potential and ionic resistance measurements. The primers were incorporated in alkyd paint systems and their anticorrosion performance was tested in the salt spray chamber and by electrochemical impedance spectroscopy. Lanthanum Tannate primers protected steel and behaved in a similar way to that formulated with zinc tetroxychromate
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Síntesis y caracterización de “tanatos” de lantano como inhibidores de la corrosión
2018Co-Authors: Oriana D’alessandro, Cecilia Deyá, Gonzalo Julián Selmi, R. RomagnoliAbstract:ABSTRACT Tannins are polyphenols synthesized by plants. They are found in Quebracho (Schinopsis Balansae) wood, Tara (Caesalpinia spinosa) fruits, etc. They have been incorporated in the coating industry as "antifouling" agents and as corrosion inhibitors in acidic solutions. Moreover, lanthanum solutions have a great inhibitory effect over SAE 1010 steel corrosion. The aim of this study was to obtain two types of lanthanum "Tannate" with low solubility, so they can be incorporated as corrosion inhibitors in temporary protective coatings, those that protect the metal during transportation and storage. Eventually, they could also be employed in anticorrosive paints. Two types of "Tannates" were obtained with two commercial Tara and Quebracho tannins and 0.1M La(NO3)3x 6H2O. The pigments were characterized by Fourrier transformance infra-red spectroscopy (FTIR) and their solubility was determined by the Folin-Denis technique. The protective action of "tanates" on SAE 1010 steel was evaluated by polarization curves and corrosion measurements in NaCl solution. The protective film formed on the steel immersed in the "Tannate" suspension was observed by scanning electron microscopy and characterized by dispersive X-ray spectroscopy. Both "Tannates" shifted the corrosion potential to more positive values and the polarization resistances were one or two orders of magnitude higher than the controls (solution without inhibitor and different concentration of commercial tannin solutions). On the other hand, the quantification of soluble metal cation and oxidizable material suggests that no premature lixiviation will occur from the coating and they can perform their protective properties for a suitable time.
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Formulation and Assessment of a Wash-Primer Containing Lanthanum “Tannate” for Steel Temporary Protection
Journal of Materials Engineering and Performance, 2017Co-Authors: Oriana D'alessandro, Cecilia Deyá, Alejandro R. Di Sarli, Gonzalo Julián Selmi, R. RomagnoliAbstract:Tannins are polyphenols synthesized by plants and useful for the coating industry as corrosion inhibitors. In addition, lanthanum salts have a great inhibitory effect on steel corrosion. The aim of this study was to obtain lanthanum “Tannate” with adequate solubility to be incorporated as the corrosion inhibitor in a wash-primer. The “Tannate” was obtained from commercial “Quebracho” tannin and 0.1 M La(NO3)3. The soluble tannin was determined by the Folin–Denis reagent, while the concentration of Lanthanum was obtained by a gravimetric procedure. The protective action of “Tannate” on SAE 1010 steel was evaluated by linear polarization curves and corrosion potential measurements. Lanthanum “Tannate” was incorporated in a wash-primer formulation and tested by corrosion potential and ionic resistance measurements. The corrosion rate was also determined by the polarization resistance technique. Besides, the primer was incorporated in an alkyd paint system and its anticorrosion performance assessed in the salt spray cabinet and by electrochemical impedance spectroscopy. Results showed that lanthanum “Tannate” primer inhibits the development of deleterious iron oxyhydroxides on the steel substrate and incorporated into a paint system had a similar behavior to the primer formulated with zinc tetroxychromate.
Oriana D'alessandro - One of the best experts on this subject based on the ideXlab platform.
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Lanthanum Derivative from “Tara” Tannin for Steel Temporary Protection
Industrial & Engineering Chemistry Research, 2018Co-Authors: Oriana D'alessandro, Cecilia Deyá, Alejandro R. Di Sarli, Gonzalo Julián Selmi, R. RomagnoliAbstract:Tannins are extracted from certain plants and contain numerous phenol groups. They may be employed, together with their derivatives, to formulate protective coatings due to their inhibitive properties. The objective of this research was to synthesize lanthanum “Tannates”, to formulate wash-primers. Two “Tara” (Caesalpinia spinosa) tannins and 0.1 M La(NO3)3 were employed to obtain the corresponding Tannates. The inhibitive action of the Tannates was evaluated by linear polarization and corrosion potential measurements employing a SAE 1010 electrode. Lanthanum Tannates were used to formulate wash-primers whose anticorrosion performance was evaluated by corrosion potential and ionic resistance measurements. The primers were incorporated in alkyd paint systems and their anticorrosion performance was tested in the salt spray chamber and by electrochemical impedance spectroscopy. Lanthanum Tannate primers protected steel and behaved in a similar way to that formulated with zinc tetroxychromate.
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Formulation and Assessment of a Wash-Primer Containing Lanthanum “Tannate” for Steel Temporary Protection
Journal of Materials Engineering and Performance, 2017Co-Authors: Oriana D'alessandro, Cecilia Deyá, Alejandro R. Di Sarli, Gonzalo Julián Selmi, R. RomagnoliAbstract:Tannins are polyphenols synthesized by plants and useful for the coating industry as corrosion inhibitors. In addition, lanthanum salts have a great inhibitory effect on steel corrosion. The aim of this study was to obtain lanthanum “Tannate” with adequate solubility to be incorporated as the corrosion inhibitor in a wash-primer. The “Tannate” was obtained from commercial “Quebracho” tannin and 0.1 M La(NO3)3. The soluble tannin was determined by the Folin–Denis reagent, while the concentration of Lanthanum was obtained by a gravimetric procedure. The protective action of “Tannate” on SAE 1010 steel was evaluated by linear polarization curves and corrosion potential measurements. Lanthanum “Tannate” was incorporated in a wash-primer formulation and tested by corrosion potential and ionic resistance measurements. The corrosion rate was also determined by the polarization resistance technique. Besides, the primer was incorporated in an alkyd paint system and its anticorrosion performance assessed in the salt spray cabinet and by electrochemical impedance spectroscopy. Results showed that lanthanum “Tannate” primer inhibits the development of deleterious iron oxyhydroxides on the steel substrate and incorporated into a paint system had a similar behavior to the primer formulated with zinc tetroxychromate.
Marei Hacke - One of the best experts on this subject based on the ideXlab platform.
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Production and validation of model iron-Tannate dyed textiles for use as historic textile substitutes in stabilisation treatment studies
Chemistry Central journal, 2012Co-Authors: Helen F. Wilson, Chris Carr, Marei HackeAbstract:For millennia, iron-Tannate dyes have been used to colour ceremonial and domestic objects shades of black, grey, or brown. Surviving iron-Tannate dyed objects are part of our cultural heritage but their existence is threatened by the dye itself which can accelerate oxidation and acid hydrolysis of the substrate. This causes many iron-Tannate dyed textiles to discolour and decrease in tensile strength and flexibility at a faster rate than equivalent undyed textiles. The current lack of suitable stabilisation treatments means that many historic iron-Tannate dyed objects are rapidly crumbling to dust with the knowledge and value they hold being lost forever. This paper describes the production, characterisation, and validation of model iron-Tannate dyed textiles as substitutes for historic iron-Tannate dyed textiles in the development of stabilisation treatments. Spectrophotometry, surface pH, tensile testing, SEM-EDX, and XRF have been used to characterise the model textiles. On application to textiles, the model dyes imparted mid to dark blue-grey colouration, an immediate tensile strength loss of the textiles and an increase in surface acidity. The dyes introduced significant quantities of iron into the textiles which was distributed in the exterior and interior of the cotton, abaca, and silk fibres but only in the exterior of the wool fibres. As seen with historic iron-Tannate dyed objects, the dyed cotton, abaca, and silk textiles lost tensile strength faster and more significantly than undyed equivalents during accelerated thermal ageing and all of the dyed model textiles, most notably the cotton, discoloured more than the undyed equivalents on ageing. The abaca, cotton, and silk model textiles are judged to be suitable for use as substitutes for cultural heritage materials in the testing of stabilisation treatments.
Gonzalo Julián Selmi - One of the best experts on this subject based on the ideXlab platform.
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Lanthanum Derivative from “Tara” Tannin for Steel Temporary Protection
Industrial & Engineering Chemistry Research, 2018Co-Authors: Oriana D'alessandro, Cecilia Deyá, Alejandro R. Di Sarli, Gonzalo Julián Selmi, R. RomagnoliAbstract:Tannins are extracted from certain plants and contain numerous phenol groups. They may be employed, together with their derivatives, to formulate protective coatings due to their inhibitive properties. The objective of this research was to synthesize lanthanum “Tannates”, to formulate wash-primers. Two “Tara” (Caesalpinia spinosa) tannins and 0.1 M La(NO3)3 were employed to obtain the corresponding Tannates. The inhibitive action of the Tannates was evaluated by linear polarization and corrosion potential measurements employing a SAE 1010 electrode. Lanthanum Tannates were used to formulate wash-primers whose anticorrosion performance was evaluated by corrosion potential and ionic resistance measurements. The primers were incorporated in alkyd paint systems and their anticorrosion performance was tested in the salt spray chamber and by electrochemical impedance spectroscopy. Lanthanum Tannate primers protected steel and behaved in a similar way to that formulated with zinc tetroxychromate.
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Lanthanum Derivative from “Tara” Tannin for Steel Temporary Protection
2018Co-Authors: Oriana D’alessandro, Alejandro R. Di Sarli, Gonzalo Julián Selmi, Cecilia Deyá, R. RomagnoliAbstract:Tannins are extracted from certain plants and contain numerous phenol groups. They may be employed, together with their derivatives, to formulate protective coatings due to their inhibitive properties. The objective of this research was to synthesize lanthanum “Tannates”, to formulate wash-primers. Two “Tara” (Caesalpinia spinosa) tannins and 0.1 M La(NO3)3 were employed to obtain the corresponding Tannates. The inhibitive action of the Tannates was evaluated by linear polarization and corrosion potential measurements employing a SAE 1010 electrode. Lanthanum Tannates were used to formulate wash-primers whose anticorrosion performance was evaluated by corrosion potential and ionic resistance measurements. The primers were incorporated in alkyd paint systems and their anticorrosion performance was tested in the salt spray chamber and by electrochemical impedance spectroscopy. Lanthanum Tannate primers protected steel and behaved in a similar way to that formulated with zinc tetroxychromate
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Síntesis y caracterización de “tanatos” de lantano como inhibidores de la corrosión
2018Co-Authors: Oriana D’alessandro, Cecilia Deyá, Gonzalo Julián Selmi, R. RomagnoliAbstract:ABSTRACT Tannins are polyphenols synthesized by plants. They are found in Quebracho (Schinopsis Balansae) wood, Tara (Caesalpinia spinosa) fruits, etc. They have been incorporated in the coating industry as "antifouling" agents and as corrosion inhibitors in acidic solutions. Moreover, lanthanum solutions have a great inhibitory effect over SAE 1010 steel corrosion. The aim of this study was to obtain two types of lanthanum "Tannate" with low solubility, so they can be incorporated as corrosion inhibitors in temporary protective coatings, those that protect the metal during transportation and storage. Eventually, they could also be employed in anticorrosive paints. Two types of "Tannates" were obtained with two commercial Tara and Quebracho tannins and 0.1M La(NO3)3x 6H2O. The pigments were characterized by Fourrier transformance infra-red spectroscopy (FTIR) and their solubility was determined by the Folin-Denis technique. The protective action of "tanates" on SAE 1010 steel was evaluated by polarization curves and corrosion measurements in NaCl solution. The protective film formed on the steel immersed in the "Tannate" suspension was observed by scanning electron microscopy and characterized by dispersive X-ray spectroscopy. Both "Tannates" shifted the corrosion potential to more positive values and the polarization resistances were one or two orders of magnitude higher than the controls (solution without inhibitor and different concentration of commercial tannin solutions). On the other hand, the quantification of soluble metal cation and oxidizable material suggests that no premature lixiviation will occur from the coating and they can perform their protective properties for a suitable time.
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Formulation and Assessment of a Wash-Primer Containing Lanthanum “Tannate” for Steel Temporary Protection
Journal of Materials Engineering and Performance, 2017Co-Authors: Oriana D'alessandro, Cecilia Deyá, Alejandro R. Di Sarli, Gonzalo Julián Selmi, R. RomagnoliAbstract:Tannins are polyphenols synthesized by plants and useful for the coating industry as corrosion inhibitors. In addition, lanthanum salts have a great inhibitory effect on steel corrosion. The aim of this study was to obtain lanthanum “Tannate” with adequate solubility to be incorporated as the corrosion inhibitor in a wash-primer. The “Tannate” was obtained from commercial “Quebracho” tannin and 0.1 M La(NO3)3. The soluble tannin was determined by the Folin–Denis reagent, while the concentration of Lanthanum was obtained by a gravimetric procedure. The protective action of “Tannate” on SAE 1010 steel was evaluated by linear polarization curves and corrosion potential measurements. Lanthanum “Tannate” was incorporated in a wash-primer formulation and tested by corrosion potential and ionic resistance measurements. The corrosion rate was also determined by the polarization resistance technique. Besides, the primer was incorporated in an alkyd paint system and its anticorrosion performance assessed in the salt spray cabinet and by electrochemical impedance spectroscopy. Results showed that lanthanum “Tannate” primer inhibits the development of deleterious iron oxyhydroxides on the steel substrate and incorporated into a paint system had a similar behavior to the primer formulated with zinc tetroxychromate.
Alejandro R. Di Sarli - One of the best experts on this subject based on the ideXlab platform.
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Lanthanum Derivative from “Tara” Tannin for Steel Temporary Protection
Industrial & Engineering Chemistry Research, 2018Co-Authors: Oriana D'alessandro, Cecilia Deyá, Alejandro R. Di Sarli, Gonzalo Julián Selmi, R. RomagnoliAbstract:Tannins are extracted from certain plants and contain numerous phenol groups. They may be employed, together with their derivatives, to formulate protective coatings due to their inhibitive properties. The objective of this research was to synthesize lanthanum “Tannates”, to formulate wash-primers. Two “Tara” (Caesalpinia spinosa) tannins and 0.1 M La(NO3)3 were employed to obtain the corresponding Tannates. The inhibitive action of the Tannates was evaluated by linear polarization and corrosion potential measurements employing a SAE 1010 electrode. Lanthanum Tannates were used to formulate wash-primers whose anticorrosion performance was evaluated by corrosion potential and ionic resistance measurements. The primers were incorporated in alkyd paint systems and their anticorrosion performance was tested in the salt spray chamber and by electrochemical impedance spectroscopy. Lanthanum Tannate primers protected steel and behaved in a similar way to that formulated with zinc tetroxychromate.
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Lanthanum Derivative from “Tara” Tannin for Steel Temporary Protection
2018Co-Authors: Oriana D’alessandro, Alejandro R. Di Sarli, Gonzalo Julián Selmi, Cecilia Deyá, R. RomagnoliAbstract:Tannins are extracted from certain plants and contain numerous phenol groups. They may be employed, together with their derivatives, to formulate protective coatings due to their inhibitive properties. The objective of this research was to synthesize lanthanum “Tannates”, to formulate wash-primers. Two “Tara” (Caesalpinia spinosa) tannins and 0.1 M La(NO3)3 were employed to obtain the corresponding Tannates. The inhibitive action of the Tannates was evaluated by linear polarization and corrosion potential measurements employing a SAE 1010 electrode. Lanthanum Tannates were used to formulate wash-primers whose anticorrosion performance was evaluated by corrosion potential and ionic resistance measurements. The primers were incorporated in alkyd paint systems and their anticorrosion performance was tested in the salt spray chamber and by electrochemical impedance spectroscopy. Lanthanum Tannate primers protected steel and behaved in a similar way to that formulated with zinc tetroxychromate
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Formulation and Assessment of a Wash-Primer Containing Lanthanum “Tannate” for Steel Temporary Protection
Journal of Materials Engineering and Performance, 2017Co-Authors: Oriana D'alessandro, Cecilia Deyá, Alejandro R. Di Sarli, Gonzalo Julián Selmi, R. RomagnoliAbstract:Tannins are polyphenols synthesized by plants and useful for the coating industry as corrosion inhibitors. In addition, lanthanum salts have a great inhibitory effect on steel corrosion. The aim of this study was to obtain lanthanum “Tannate” with adequate solubility to be incorporated as the corrosion inhibitor in a wash-primer. The “Tannate” was obtained from commercial “Quebracho” tannin and 0.1 M La(NO3)3. The soluble tannin was determined by the Folin–Denis reagent, while the concentration of Lanthanum was obtained by a gravimetric procedure. The protective action of “Tannate” on SAE 1010 steel was evaluated by linear polarization curves and corrosion potential measurements. Lanthanum “Tannate” was incorporated in a wash-primer formulation and tested by corrosion potential and ionic resistance measurements. The corrosion rate was also determined by the polarization resistance technique. Besides, the primer was incorporated in an alkyd paint system and its anticorrosion performance assessed in the salt spray cabinet and by electrochemical impedance spectroscopy. Results showed that lanthanum “Tannate” primer inhibits the development of deleterious iron oxyhydroxides on the steel substrate and incorporated into a paint system had a similar behavior to the primer formulated with zinc tetroxychromate.