Issue 61, 2021

Chloride corrosion behavior on heating pipeline made by AISI 304 and 316 in reclaimed water

Abstract

In order to transport reclaimed water safely through stainless steel (SS) heat-supply pipeline networks during their idle period, one must understand the degree to which chlorine in reclaimed water is corrosive to SS. In this study, electrochemical methods were used to evaluate the corrosion resistances of two types of SS materials, AISI 304 and AISI 316, in simulated reclaimed water at chloride concentrations of 25 to 400 mg Lāˆ’1, which are similar to those present in practice. The differences in corrosion resistance between the two types of SS material were investigated using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests (Tafel curves). The passivation layers on the two types of SS exhibited obvious similarities under several experimental conditions. However, EIS, polarization resistance, effective capacitance, Tafel curve, and Scanning Electron Microscope (SEM) data showed that AISI 316 has better corrosion resistance than AISI 304. The corrosion behaviours could be described as a series of reactions between Fe, Cr, and H2O that generate several precipitated products such as Fe2O3, Cr2O3, FeOOH, and CrOOH.

Graphical abstract: Chloride corrosion behavior on heating pipeline made by AISI 304 and 316 in reclaimed water

Supplementary files

Article information

Article type
Paper
Submitted
06 Sep 2021
Accepted
22 Nov 2021
First published
02 Dec 2021
This article is Open Access
Creative Commons BY license

RSC Adv., 2021,11, 38765-38773

Chloride corrosion behavior on heating pipeline made by AISI 304 and 316 in reclaimed water

X. Chen, H. Liu, X. Sun, B. Zan and M. Liang, RSC Adv., 2021, 11, 38765 DOI: 10.1039/D1RA06695A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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