Effects of anions on corrosion behaviour of carbon steel in simulated groundwater in China

Abstract

Carbon steel is a candidate material for the disposal container of high-level nuclear waste in a deep geological repository in China, which will be subject to general corrosion and localised attack. In this work, the effects of Cl − , SO 4 2-and CO 3 2− concentrations on the general corrosion and crevice corrosion of carbon steel were studied by immersion tests and electrochemical measurements. The results show that Cl − promotes general corrosion, while SO 4 2− and CO 3 2− inhibit general corrosion. In a single ion solution, SO 4 2− is the most obvious in promoting the crevice corrosion, which is different from the result of carbon steel in groundwater solution. Cl − , rather than SO 4 2− , dominates the crevice corrosion process of carbon steel in groundwater solution.ARTICLE HISTORY

Chemistry conditions and corrosion behaviour in simulated crevices of alloy steel

“…It was 250 and 316.6 ppb in bigger and smaller crevices, respectively. Xu et al have reported that ion promotes crevice corrosion in carbon steel more compared to Cl − in single ion solutions whereas; in groundwater solutions (containing a mixture of anions) Cl- dominates the process [27].…”

Corrosion Performance of 201 low-Nickel Stainless Steel Anchor in Cl–Contaminated Underground Water with Various Concentrations of SO42−and HCO3−

“…Before testing, the samples were degreased with ethanol and deionized water. A solution, with a similar composition to the groundwater in the North Mountain in Gansu, China, 24,25 was used as the standard solution, and contained 0.2051 mol l −1 Cl − , 0.0775 mol l −1 SO 4 2− , and 0.0167 mol l −1 HCO 3 − (pH 7.23). As shown in Table II, experimental solutions with different chemical compositions were prepared to investigate the effects of chemical compositions (except Cl − , which has been reported in an earlier study 26 ) of underground water on the corrosion behavior of low-nickel stainless steel.…”

Corrosion Prevention of Cast Iron Industrial Water Pipes: A Preliminary Comparative Study of Hexamine and Aniline Inhibitors

“…This declining is perhaps because of the stability of ferric oxide film that formed after corrosion occurrence. The phenomena is known for corrosion inhibitor behavior of anions in aqueous solutions (Xu et al 2017). In general, it is noticed that the corrosion rate is highly reduced in the solutions contain hexamine or aniline inhibitor.…”