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 L−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.
Highlights
As a new type of renewable resource, reclaimed municipal wastewater is typically used extensively for industrial purposes.[1,2,3] it is gradually becoming recognised as a secondary urban water source
The raw experimental results indicate that this system seems to be de ned by a single resistance process
The electrochemical impedance spectroscopy (EIS) results indicated that the two stainless steel (SS) materials are highly similar
Summary
As a new type of renewable resource, reclaimed municipal wastewater is typically used extensively for industrial purposes.[1,2,3] it is gradually becoming recognised as a secondary urban water source. CS pipelines typically provide weaker corrosion resistance than SS pipelines during long-running water delivery processes.[5] This can result in the accumulation of corrosion products on the inner wall and affect water quality and safety. Previous studies have revealed that there is no signi cant precipitation of metal ions in SS pipelines during transportation of reclaimed water.[6,7] Use of SS pipelines may be a reliable corrosion-protection method capable of guaranteeing good reclaimed water quality.[8] The most common SS pipeline materials are austenitic SS (AISI 304 and AISI 316), which account for about 70% of all SS use.
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