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Corrosion and protection of metals

Keywords: corrosion, accelerating ageing, electrochemical measurements, surface characterization
Fig. 1. Fig. 1. Electrochemical cell with thermostat (picture by M.C. Bignozzi).
Fig. 2. Polarisation curves (picture by M.C. Bignozzi).
Corrosion and protection of metals - Fig. 3
Fig. 3 Sample ageing in salt-spray test chamber (picture by G. Masi).

The aim of the research is the development of guidelines for the prevention and protection from corrosion of ferrous and not-ferrous alloys exposed to different environments. Research projects concern the study of corrosion mechanisms and protection of metal alloys used in the industrial sector (i.e. “Corrosion of 316L in Ultrahigh- Purity Water for Pharmaceutical Indus-tries” and “Corrosion of different steels in Chemical Plants”), in Cultural Heritage (i.e. “Corrosion behaviour and protection of outdoor bronzes”) and in architecture/building construction (i.e. “Atmospheric corrosion of COR-TEN steel with different surface finish” and “Corrosion of steel bar reinforcement in geopolymer or cement matrix”). In particular, the evaluation of the corrosion behaviour and the protective efficiency of coatings is performed through accelerated ageing (salt spray and environmental test chambers), surface analyses, thermal analyses, electrochemical measurements.

Research activities are carried out in collaboration with research groups of the Departments of Cultural heritage (Dr. Cristina Chiavari), Industrial Engineering (Dr. Carla Martini), and Industrial Chemistry «Toso Montanari» (Dr. Elena Bernardi), University of Bologna.

Moreover, projects in collaboration with nation-al and international research centers and companies are developed in order to solve technological problems due to unexpected corrosion phenomena.

Research projects

“Bronze-IMproved non-hazardous PAtina CoaTings” (B-IMPACT) – M-ERA.net call 2013. Two years project: 2015-2017.
Coordinator: Slovenian National Building and Civil Engineering Institute – S-ZAG.
Partners: University of Bologna (Italy), University of Ferrara (Italy), Toulouse University (France), Ecamricert S.R.L.(Italy), Pylote (France), Livartis (Ljubljana, Slovenia) e C2M (France).

Main publications

Masi, G., Chiavari, C., Avila, J., Esvan, J., Raffo, S., Bignozzi, M.C., Asensio, M.C., Robbiola, L., Martini, C. (2016). Corrosion investigation of fire-gilded bronze involving high surfaceresolution spectroscopic imaging, Applied Surface Science 366, 317–327.

Chiavari, C., Martini, C., Montalbani, S., Franzoni, E., Bignozzi, M.C., Passeri, M.C. (2016) The bronze panel (paliotto) of San Moisè in Venice: Materials and causes of deterioration. Materials and Corrosion, 67, 141-151.

Chiavari, C., Bernardi, E., Balbo, A., Monticelli, C., Raffo, S., Bignozzi, M.C., Martini, C. (2015) Atmospheric corrosion of fire-gilded bronze: corrosion and corrosion protection during accelerated ageing tests. Corrosion Science, 100, 435-447.

Chiavari, C., Balbo, A., Bernardi, E., Martini, C., Zanotto, F., Vassura, I., Bignozzi, M.C., Monticelli, C. (2015). Organosilane coatings applied on bronze: Influence of UV radiation and thermal cycles on the protectiveness. Progress in Organic Coatings, 82, 91–100.

Bernardi E., Bignozzi M.C., Chiavari C., Gandolfi N., Martini C., Mattei A., Sessa S. (2015) Corrosion of AISI 316L in ultrahigh-purity water: surface analyses and metal release, Pharmaceutical Engineering, 71-77.

Robbiola, L., Chiavari, C., Bernardi, E., Bignozzi, M. C., Martini C. (2014). General understanding of outdoor bronze corrosion in Métal À Ciel Ouvert (Open Air Metal) - ISBN:2-905430-18-4, Proceedings of Open Air Metal: outdoor metallic sculpture from 19th to early 20th century. Identification, conservation, restoration. Paris (France), 146-153.

Chiavari C., Bernardi E., Cauzzi D., Volta S., Bignozzi M.C., Lenza B., Montalbani S., Robbiola L. and Martini C. (2013). Influence of natural patinas of outdoor quaternary bronzes on conservation treatment. METAL 2013: Proceedings of the Interim Meeting of the ICOM-CC Metal Working Group. Edimburgh, United Kingdom, 16-20/9/2013.

Chiavari C., Bernardi E., Lenza B., Martini C., Vassura I., Motori A., Balbo A. and Monticelli C. (2013). Organosilane coatings applied on bronze: natural exposure and exposure to temperature/UV cy-cles. Proceedings of Eurocorr 2013 (EFC Event n.343), 01-5/09/2013, Estoril, Portugal (EFC, London, UK, CD-ROM).

Chiavari C., Balbo A., Bernardi E., Martini C., Bignozzi M.C., Abbottoni M. and Monticelli C. (2013). Protective silane treatment for patinated bronze exposed to simulated natural environments. Materials Chemistry and Physics 141, No. 1, 502-511.

Chiavari C., Bernardi E., Martini C., Vassura I., Motori A. and Bignozzi M.C. (2012). COR-TEN steel: atmospheric corrosion behavior by accelerated ageing”, Proceedings of Eurocorr 2012 (EFC Event n.330), 09-13/09/2012, Istanbul, Turkey (EFC, London, UK, CD-ROM), 1-14.

Chiavari C., Bernardi E., Balbo A., Monticelli C., Passarini F., Bignozzi M.C. and Martini C. (2012). Influence of nanoparticles on the inhibiting efficiency of organosilane coatings on bronze. Part 2: metal release in accelerated ageing tests. Proceedings of Eurocorr 2012 (EFC Event n.330), 09-13/09/2012, Istanbul, Turkey (EFC, London, UK, CD-ROM), 1-11.

Chiavari C., Bernardi E., Martini C., Passarini F., Motori A. and Bignozzi M.C (2012). Atmospheric corrosion of Cor-Ten steel with different surface finish: Accelerated ageing and metal release. Materials Chemistry and Physics 136, 477-486.

Bignozzi M.C., Manzi S. and Tattini E. (2012). Corrosion behaviour of steel reinforced mortars based on alkali activated materials. Proceedings of Eurocorr 2012 (EFC Event n.330), CD-ROM. Istanbul, Turkey, 09-13/09/2012, LONDON: European Federation of Corrosion (EFC), 1-9.

Bignozzi M.C. and Bonduà S. (2011). Alternative blended cement with ceramic residues: Corrosion resi-stance. Cement and Concrete Research 41, 947–954.