Galvanic Corrosion Behavior of Ductile Iron/H62 Brass in Water Distribution System

TANG Tian, ZHU Zhiping, TANG Yunzi, LIU Jian, MAO Chunkui

doi:10.16577/j.issn.1001-1560.2024.0155

Materials Protection >

2024 , Vol. 57 >Issue 7: 93 - 101

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0155

Galvanic Corrosion Behavior of Ductile Iron/H62 Brass in Water Distribution System

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(1.Department of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China；2.Changsha Water Supply Company, Changsha 410035, China)

ZHU Zhiping (1963－), Professor, Ph.D., Research Focus: Electrochemistry, E-mail: zzp8389＠163.com

Received date: 2023-03-16

Revised date: 2023-07-25

Accepted date: 2023-07-29

Online published: 2024-08-16

Supported by

Hunan Provincial Department of Education Scientific Research Key Project (23A0269)

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Abstract

In order to investigate the galvanic corrosion of the connection between ductile cast iron and H62 brass water pipe in tap water supply network, electrochemical noise (EN), EDS, SEM and other methods were used to investigate the galvanic corrosion current, corrosion morphology and corrosion product composition of ductile cast iron /H62 brass electrode at different temperatures (0 ℃, 25 ℃, 40 ℃) and the specific surface area ratios of anode and cathode (Sc ∶Sa ＝1 ∶1、2 ∶1、4 ∶1) under the condition of simulated acidic industrial atmospheric corrosion.Results showed that when the nodular cast iron/H62 brass electrode was coupled, the nodular cast iron served as the anode, and the galvanic corrosion current density was 3.46 times that of its self-corrosion process.The anode corrosion of couple pair was intensified with the increase of temperature.With the increase of Sc ∶Sa, the galvanic corrosion current density increased.Furthermore, the Ig-t and Eg-t spectra of electrochemical noise revealed that the change in charge when the anode protection film of the electric couple pair was damaged and pitting occurred.Hence, the galvanic effect promoted the occurrence of pitting corrosion in anode ductile iron.

Key words： ductile iron; H62 brass; galvanic corrosion; corrosion current; electrochemical noise

Cite this article

TANG Tian, ZHU Zhiping, TANG Yunzi, LIU Jian, MAO Chunkui . Galvanic Corrosion Behavior of Ductile Iron/H62 Brass in Water Distribution System[J]. Materials Protection, 2024 , 57(7) : 93 -101 . DOI: 10.16577/j.issn.1001-1560.2024.0155

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