The problem related to the cyclic aerobic and anoxic exposition of marine constructions in Mild S... more The problem related to the cyclic aerobic and anoxic exposition of marine constructions in Mild Steel (MS) and/or AISI 316L stainless steel (SS), immersed in the peculiar Venice Lagoon environment was studied. The influence of the annual macro fouling settlement on the corrosion behaviour of these metals was investigated by means of corrosion rates (CRs), electrochemical, crevice corrosion (CC) and
Journal of Applied Electrochemistry - J APPL ELECTROCHEM, 1999
Handled stainless steel (SS) structures often need accurate passivating treatments before use. Un... more Handled stainless steel (SS) structures often need accurate passivating treatments before use. Until now the most frequently used passivating pastes have been based on nitric (fluoridric) acid and, as a result, are responsible for consequent environmental problems. This work addresses the SS passivation quality of two low environmental impact pastes, based on peroximonosulfate (P2) or sodium perborate (P3). Tests were conducted on various materials using electrochemical tests (cyclic voltammetry, anodic potentiostatic transients, open-circuit potential (E) decay), Microscopic and Inductively Coupled Plasma (ICP) measurements. The results, when compared with those obtained on the same materials by using a conventional nitric acid paste (P1), indicate that the proposed pastes P2 and P3 are time stable, non toxic and as efficient as the P1 paste. Moreover, the protection of the tested SS can be further enhanced by adding small amounts of citric acid to, in particular, the P3 paste.
... We thank Dr. Laura Sperni for mass spectra, Sig. Augusto Tassan for NMR spectra and for eleme... more ... We thank Dr. Laura Sperni for mass spectra, Sig. Augusto Tassan for NMR spectra and for elemental analysis, and Dr. Marco Bortoluzzi for the helpful suggestions and discussions. BIBLIOGRAPHY. ... 6 Quartarone, G.; Bellomi, T.; Zingales, A. Corros Sci 2003, 45, 715. ...
5-aminoindole (AI) and 5-chloroindole (CI) were tested as corrosion inhibitors of mild steel in 1... more 5-aminoindole (AI) and 5-chloroindole (CI) were tested as corrosion inhibitors of mild steel in 1 N deaerated sulphuric acid. Their behaviour was compared with that of indole (IN) in the temperature range of 25 to 55 °C. The inhibiting effect of AI and CI is more pronounced on the anodic rather than cathodic process with the exception of CI at
Abstract It has been suggested that the sigma phase and its preliminary phases are responsible fo... more Abstract It has been suggested that the sigma phase and its preliminary phases are responsible for intergranular corrosion of molybdenum-containing austenitic stainless steels in such environments ...
AbstractThe inhibiting effect of 5-hydroxyindole (HI) and 5-nitroindole (NI) on mild steel corros... more AbstractThe inhibiting effect of 5-hydroxyindole (HI) and 5-nitroindole (NI) on mild steel corrosion in 0·5M sulphuric acid is reported in comparison with that of indole (IN). In the temperature range 25-55°C the inhibiting effect of HI and NI (as IN) is generally more pronounced on the anodic rather than on the cathodic process. HI and NI did not substantially affect the corrosion reaction mechanism. The corrosion rates decreased as inhibitor concentration increased, but as the temperature increased higher corrosion rates resulted. At 25, 35, 45, and 55°C the adsorption of NI and IN follows Frumkin's isotherm, while that of HI followed that of Temkin. The best inhibiting effect was obtained at the highest concentrations (0·005-0·0075M) of IN (inhibition percentage (IP) = 97%) and HI (IP = 60%) up to 25-35°C, while NI does not significantly act as a corrosion inhibitor.
Traditional electrochemical tests and the contact electrical resistance technique (CER) were used... more Traditional electrochemical tests and the contact electrical resistance technique (CER) were used to investigate the effect on corrosion of pure copper (99.999 wt%) of adding benzotriazole (BTA) and 1-hydroxybenzotriazone (1-OH-BTA) to acidic solutions (sulfuric acid [HâSOâ], pH = 1.7, and sodium sulfate [NaâSOâ] until total sulfate [SOâ²â»] concentration = 0.1 M). This technique permitted growth of oxide and/or salt films as well as adsorption of the organic inhibitors on the copper surface to be evaluated. Formation of copper oxide ([CuâO]â)., sulfate (CuSoâ·5HâO), thiocyanate (CuSCN), and halogenyde (CuI, CuBr, and CuCl) films on copper electrodes was followed in situ in sulfate solutions at various pH values under low overpotentials. Effects of pH, solution anion content, and/or the amount of BTA or 1-OH-BTA on electrical resistance (R) of the surface films formed on pure copper electrodes were treated. BTA acted as a more efficient corrosion inhibitor than 1-OH-BTA, reaching inhibition percentages (IP) of â¼90% compared to those of 1-OH-BTA, which reached a maximum of â¼76% in 2 à 10â»Â³ M solutions. It was possible to distinguish between maximum R of the surface film, found in solutions containing BTA, associated with the adsorption of neutral inhibitor molecules, and the sharp rise in R attributable to [Cu(BTA)]{sub n} complex formation.
The problem related to the cyclic aerobic and anoxic exposition of marine constructions in Mild S... more The problem related to the cyclic aerobic and anoxic exposition of marine constructions in Mild Steel (MS) and/or AISI 316L stainless steel (SS), immersed in the peculiar Venice Lagoon environment was studied. The influence of the annual macro fouling settlement on the corrosion behaviour of these metals was investigated by means of corrosion rates (CRs), electrochemical, crevice corrosion (CC) and
Journal of Applied Electrochemistry - J APPL ELECTROCHEM, 1999
Handled stainless steel (SS) structures often need accurate passivating treatments before use. Un... more Handled stainless steel (SS) structures often need accurate passivating treatments before use. Until now the most frequently used passivating pastes have been based on nitric (fluoridric) acid and, as a result, are responsible for consequent environmental problems. This work addresses the SS passivation quality of two low environmental impact pastes, based on peroximonosulfate (P2) or sodium perborate (P3). Tests were conducted on various materials using electrochemical tests (cyclic voltammetry, anodic potentiostatic transients, open-circuit potential (E) decay), Microscopic and Inductively Coupled Plasma (ICP) measurements. The results, when compared with those obtained on the same materials by using a conventional nitric acid paste (P1), indicate that the proposed pastes P2 and P3 are time stable, non toxic and as efficient as the P1 paste. Moreover, the protection of the tested SS can be further enhanced by adding small amounts of citric acid to, in particular, the P3 paste.
... We thank Dr. Laura Sperni for mass spectra, Sig. Augusto Tassan for NMR spectra and for eleme... more ... We thank Dr. Laura Sperni for mass spectra, Sig. Augusto Tassan for NMR spectra and for elemental analysis, and Dr. Marco Bortoluzzi for the helpful suggestions and discussions. BIBLIOGRAPHY. ... 6 Quartarone, G.; Bellomi, T.; Zingales, A. Corros Sci 2003, 45, 715. ...
5-aminoindole (AI) and 5-chloroindole (CI) were tested as corrosion inhibitors of mild steel in 1... more 5-aminoindole (AI) and 5-chloroindole (CI) were tested as corrosion inhibitors of mild steel in 1 N deaerated sulphuric acid. Their behaviour was compared with that of indole (IN) in the temperature range of 25 to 55 °C. The inhibiting effect of AI and CI is more pronounced on the anodic rather than cathodic process with the exception of CI at
Abstract It has been suggested that the sigma phase and its preliminary phases are responsible fo... more Abstract It has been suggested that the sigma phase and its preliminary phases are responsible for intergranular corrosion of molybdenum-containing austenitic stainless steels in such environments ...
AbstractThe inhibiting effect of 5-hydroxyindole (HI) and 5-nitroindole (NI) on mild steel corros... more AbstractThe inhibiting effect of 5-hydroxyindole (HI) and 5-nitroindole (NI) on mild steel corrosion in 0·5M sulphuric acid is reported in comparison with that of indole (IN). In the temperature range 25-55°C the inhibiting effect of HI and NI (as IN) is generally more pronounced on the anodic rather than on the cathodic process. HI and NI did not substantially affect the corrosion reaction mechanism. The corrosion rates decreased as inhibitor concentration increased, but as the temperature increased higher corrosion rates resulted. At 25, 35, 45, and 55°C the adsorption of NI and IN follows Frumkin's isotherm, while that of HI followed that of Temkin. The best inhibiting effect was obtained at the highest concentrations (0·005-0·0075M) of IN (inhibition percentage (IP) = 97%) and HI (IP = 60%) up to 25-35°C, while NI does not significantly act as a corrosion inhibitor.
Traditional electrochemical tests and the contact electrical resistance technique (CER) were used... more Traditional electrochemical tests and the contact electrical resistance technique (CER) were used to investigate the effect on corrosion of pure copper (99.999 wt%) of adding benzotriazole (BTA) and 1-hydroxybenzotriazone (1-OH-BTA) to acidic solutions (sulfuric acid [HâSOâ], pH = 1.7, and sodium sulfate [NaâSOâ] until total sulfate [SOâ²â»] concentration = 0.1 M). This technique permitted growth of oxide and/or salt films as well as adsorption of the organic inhibitors on the copper surface to be evaluated. Formation of copper oxide ([CuâO]â)., sulfate (CuSoâ·5HâO), thiocyanate (CuSCN), and halogenyde (CuI, CuBr, and CuCl) films on copper electrodes was followed in situ in sulfate solutions at various pH values under low overpotentials. Effects of pH, solution anion content, and/or the amount of BTA or 1-OH-BTA on electrical resistance (R) of the surface films formed on pure copper electrodes were treated. BTA acted as a more efficient corrosion inhibitor than 1-OH-BTA, reaching inhibition percentages (IP) of â¼90% compared to those of 1-OH-BTA, which reached a maximum of â¼76% in 2 à 10â»Â³ M solutions. It was possible to distinguish between maximum R of the surface film, found in solutions containing BTA, associated with the adsorption of neutral inhibitor molecules, and the sharp rise in R attributable to [Cu(BTA)]{sub n} complex formation.
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