Simone Pellegrini
University of Bergamo
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Publication
Featured researches published by Simone Pellegrini.
Journal of Chemistry | 2015
Marina Cabrini; Francesca Fontana; Sergio Lorenzi; Tommaso Pastore; Simone Pellegrini
The inhibition properties of aspartic and lactic acid salts are compared with nitrite ions with regard to their effect on critical chloride concentration. The tests were carried out on carbon steel specimens in simulated pore solutions with initial pH in the range of 12.6 to 13.8. The critical chloride concentrations were estimated through multiple specimen potentiostatic tests at potentials in the usual range for passive rebar in noncarbonated concrete structures. During tests, chloride ions were progressively added until all specimens showed localized attack, obtaining cumulative distribution curves reporting the fraction of corroded specimens as a function of chloride concentration. The presence of the organic inhibitors on the passivity film was detected by IR spectra. The results confirm that 0.1 M aspartate exhibits an inhibiting effect comparable with nitrite ions of the same concentration. Calcium lactate does not increase critical chloride concentration; however it appears to promote the formation of a massive scale, reducing the corrosion propagation.
Corrosion Reviews | 2015
Marina Cabrini; Sergio Lorenzi; Simone Pellegrini; Tommaso Pastore
Abstract This article deals with the risk of environmentally assisted cracking of steel structures that are kept under cathodic protection (CP). The experimental results collected on both hydrogen diffusion and hydrogen embrittlement (HE) of high-strength low-alloy (HSLA) steels under CP are discussed. Hydrogen diffusion was evaluated by permeation experiments and a scanning photoelectrochemical current technique, as a function of microstructure orientation, on both loaded and unloaded specimens. HE tests were carried out under constant load, slow strain rate (SSR tests), and slow bending conditions. Tests were also carried out on several grades of HSLA steel having different microstructures. The results confirm that HE in artificial seawater under CP can occur in steel with tensile yield strength in the range of 400–660 MPa only in the presence of high cathodic polarization and continuous plastically straining conditions. HE susceptibility increased with increasing applied cathodic polarization and with decreasing strain rate. HE susceptibility of the rolled steels at relatively high strain rate (10-4 to 10-5 s-1) increased with the hydrogen diffusion coefficient. Similar results were observed in terms of the HE contribution to corrosion fatigue crack growth rate. High-temperature-tempered martensitic steels showed a lower HE susceptibility.
Materials | 2017
Marina Cabrini; Sergio Lorenzi; Tommaso Pastore; Simone Pellegrini; Mauro Burattini; Roberta Miglio
The paper deals with the corrosion behavior of stainless steels as candidate materials for biofuel production plants by liquefaction process of the sorted organic fraction of municipal solid waste. Corrosion tests were carried out on AISI 316L and AISI 304L stainless steels at 250 °C in a batch reactor during conversion of raw material to bio-oil (biofuel precursor), by exposing specimens either to water/oil phase or humid gas phase. General corrosion rate was measured by weight loss tests. The susceptibility to stress corrosion cracking was evaluated by means of U-bend specimens and slow stress rate tests at 10−6 or 10−5 s−1 strain rate. After tests, scanning electron microscope analysis was carried out to detect cracks and localized attacks. The results are discussed in relation with exposure conditions. They show very low corrosion rates strictly dependent upon time and temperature. No stress corrosion cracking was observed on U-bend specimens, under constant loading. Small cracks confined in the necking cone of specimens prove that stress corrosion cracking only occurred during slow strain rate tests at stresses exceeding the yield strength.
Journal of Materials Processing Technology | 2016
Marina Cabrini; Sergio Lorenzi; Tommaso Pastore; Simone Pellegrini; Diego Giovanni Manfredi; Paolo Fino; Sara Biamino; Claudio Francesco Badini
Electrochimica Acta | 2016
Marina Cabrini; Sergio Lorenzi; Tommaso Pastore; Simone Pellegrini; Elisa Paola Ambrosio; Flaviana Calignano; Diego Giovanni Manfredi; Matteo Pavese; Paolo Fino
Surface and Interface Analysis | 2016
Marina Cabrini; Sergio Lorenzi; Tommaso Pastore; Simone Pellegrini; Matteo Pavese; Paolo Fino; Elisa Paola Ambrosio; Flaviana Calignano; Diego Giovanni Manfredi
Archive | 2017
Marina Cabrini; Sergio Lorenzi; Tommaso Pastore; Simone Pellegrini; Cristian Testa; Diego Giovanni Manfredi; Flaviana Calignano; Paolo Fino; Giulio Cattano
International Workshop on Durability and Sustainability of Concrete Structures | 2015
Luigi Coppola; Sergio Lorenzi; Simone Pellegrini
Surface and Interface Analysis | 2016
Marina Cabrini; Sergio Lorenzi; Tommaso Pastore; Simone Pellegrini; Matteo Pavese; Paolo Fino; Elisa Paola Ambrosio; Flaviana Calignano; Diego Giovanni Manfredi
Archive | 2016
Marina Cabrini; Sergio Lorenzi; Tommaso Pastore; Simone Pellegrini; Diego Pesenti Bucella