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Article

Corrosion Behavior of Different Brass Alloys for Drinking Water Distribution Systems

1
Centro di Studi sulla Corrosione e Metallurgia “A. Daccò”, Dipartimento di Ingegneria, Università di Ferrara, 44122 Ferrara, Italy
2
Laboratory of Materials Engineering and Environment: Modeling and Application, Faculty of Science, University Ibn Tofail, 14000 Kenitra, Morocco
3
International Institute for Water and Sanitation (IEA), National Office of Electricity and the Potable Water, 90000 Rabat, Morocco
*
Author to whom correspondence should be addressed.
Metals 2019, 9(6), 649; https://doi.org/10.3390/met9060649
Received: 31 March 2019 / Revised: 22 May 2019 / Accepted: 2 June 2019 / Published: 4 June 2019
(This article belongs to the Special Issue Corrosion and Protection of Metals)
Some α + β’ brass components of drinking water distribution systems in Morocco underwent early failures and were investigated to assess the nature and extent of the corrosion attacks. They exhibited different corrosion forms, often accompanied by extensive β’ dezincification. In order to offer viable alternatives to these traditional low cost materials, the corrosion behavior of two representative α + β’ brass components was compared to that of brass alloys with nominal compositions CuZn36Pb2As and CuZn21Si3P, marketed as dezincification resistant. CuZn21Si3P is a recently developed eco-friendly brass produced without any arsenic or lead. Electrochemical tests in simulated drinking water showed that after 10 days of immersion CuZn21Si3P exhibited the highest polarization resistance (Rp) values but after longer immersion periods its Rp values became comparable or lower than those of the other alloys. After 150 days, scanning electron microscope coupled to energy dispersive spectroscopy (SEM-EDS) analyses evidenced that the highest dezincification resistance was afforded by CuZn36Pb2As (longitudinal section of extruded bar), exhibiting dealloying and subsequent oxidation of β’ only at a small depth. Limited surface dealloying was also found on CuZn21Si3P, which underwent selective silicon and zinc dissolution and negligible inner oxidation of both α and κ constituent phases, likely due to peculiar galvanic effects. View Full-Text
Keywords: brass; CuZn36Pb2As; CuZn21Si3P; corrosion; dezincification; simulated drinking water; EIS; SEM-EDS; long immersion brass; CuZn36Pb2As; CuZn21Si3P; corrosion; dezincification; simulated drinking water; EIS; SEM-EDS; long immersion
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MDPI and ACS Style

Choucri, J.; Zanotto, F.; Grassi, V.; Balbo, A.; Ebn Touhami, M.; Mansouri, I.; Monticelli, C. Corrosion Behavior of Different Brass Alloys for Drinking Water Distribution Systems. Metals 2019, 9, 649. https://doi.org/10.3390/met9060649

AMA Style

Choucri J, Zanotto F, Grassi V, Balbo A, Ebn Touhami M, Mansouri I, Monticelli C. Corrosion Behavior of Different Brass Alloys for Drinking Water Distribution Systems. Metals. 2019; 9(6):649. https://doi.org/10.3390/met9060649

Chicago/Turabian Style

Choucri, Jamal, Federica Zanotto, Vincenzo Grassi, Andrea Balbo, Mohamed Ebn Touhami, Ilyass Mansouri, and Cecilia Monticelli. 2019. "Corrosion Behavior of Different Brass Alloys for Drinking Water Distribution Systems" Metals 9, no. 6: 649. https://doi.org/10.3390/met9060649

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