Corrosion behaviour characterisation of 316L stainless steel and Inconel 625 in supercritical water containing hydrochloric acid and high oxygen

Abstract

Corrosion was currently the most crucial factor hindering the commercial development of supercritical water oxidation (SCWO) technology. Stainless steel represented by 316L and Ni-based alloy represented by Inconel 625 were performed and compared with corrosion resistance in supercritical environment with high concentrations of oxygen and chlorides. The results shown that the duplex layer was formed on two samples. The surface of 316L SS was mainly composed of loose magnetite and haematite, resulted in pitting corrosion, microcracks, and the exfoliation of oxide. The inner layer were separately a small amount of Cr 2 O 3 oxide and FeCr 2 O 4 spinel, which were caused by the lower content of chromium. Compared with 316L SS, the oxide film structure of Inconel 625 was composed of the outer layer of spinel and the inner layer of Cr-rich oxide. Some nodular oxides were formed, and it can be explained by the volatilisation process of chromium.

WITHDRAWN: Hot Corrosion Evaluation of Cr 3 C 2 /8YSZ based Plasma Sprayed Coatings on SS316 in Na 2 SO 4 – V 2 O 5 Molten Salt Environment at 700 0 C

“…The molten salts act as corrosive species that react with metal surfaces in a hot gas environment. Thus, coating on austenitic steel is highly preferable to counteract the deposited corrosive species and protect the components [1][2][3][4][5]. Plasma spray coating has shown to be an appropriate and cost-effective method for solving a wide range of issues in the manufacturing sector.…”

Parameter Optimization and Mechanical Properties of Laser Cladding of 316L Stainless Steel Powder on G20Mn5QT Steel

“…After the study of various powder materials, it was found that the 316L stainless steel powder is more suitable for the repair of the substrate selected in this paper. Due to its low cost [25], good corrosion resistance, high toughness and plasticity, good formability [26], and good weldability [25,27], 316L stainless steel is an austenitic stainless steel commonly used for various industries [28][29][30][31][32] and structures in corrosive environments [33][34][35]. Some scholars [36] have studied the effect of heat treatment on the wear behavior of additively manufactured 316L stainless steel and found that the heat treatment process leads to a decrease in hardness and wear resistance.…”