Corrosion of N10276 in a H2S, HCl, and CO2 Containing Atmosphere at 480 °C and 680 °C

Abstract

In several industrial processes, metallic materials suffer from chlorine- and sulfur-induced high-temperature corrosion. In previous studies, several steels have been tested at laboratory scale in a simulated gas atmosphere of a pyrolysis process of anthropogenic resources. In this paper, we propose a model on the course of corrosion in a H2S and HCl-containing atmosphere for N10276, which contains, besides iron, chromium, and nickel, also molybdenum as main alloying element. Bearing in mind the impact of the main alloying elements, as well as thermodynamic considerations and kinetic effects, the corrosion behavior of N10276 in a H2S and HCl-containing atmosphere at 480 °C and 680 °C can be explained. In addition, the corrosion behavior of N10276 is compared with earlier tested Fe-Cr-Ni alloys and differences in the corrosion behavior are stated within this paper.

High temperature corrosion behavior of alloys in reducing HCl and H2S containing environments: Thermodynamical and experimental assessment

“…SEM/EDX mappings, which show the corrosion structures of the ferritic and austenitic alloys, either can be found in previous studies [ 6,18–22,24,25 ] or for some selected conditions on representative examples of K90941 and N08811 in Figures 7–14. SEM/EDX mappings of K90941 and N08811 for the remaining conditions can be found in the Supporting Information Materials.…”

“…During several studies, experimental know‐how in the field of reducing HCl‐ and H 2 S‐ containing environments was gained (Table 1) and different corrosion mechanisms for diverse alloys under different conditions were developed. [ 18,20,24,25 ] These mechanisms are mainly based on practical observations and experience and only less on thermodynamic data. This is due to the complexity of these mixed gas atmospheres, the impact of volatile corrosion products, and the ever‐changing conditions within the corrosion layer, which made it hard to predict the actual corrosion behavior.…”

“…In contrast to many fundamental processes of high‐temperature corrosion that are nowadays understood, for complex technical atmospheres and sophisticated technical materials, this knowledge can only be used to make approaches and to interpret observed tendencies. [ 6,18–25 ] Thus, there is still a strong need for intensive research in the field of high‐temperature corrosion, based on experimental investigations, to describe the actual behavior of the materials and the corrosion mechanisms behind this.…”

“…The high‐temperature corrosion behavior in reducing HCl and H 2 S containing atmospheres of several alloys, ranging from low‐alloyed ferritic K90941 up to highly alloyed austenitic N10276, was investigated at various conditions during previous studies [ 6,18–22,24,25,29,30 ] and different corrosion models were generated. [ 18,20,24,25 ] In Table 1, an overview of all performed experiments in reducing HCl and H2S‐containing atmospheres is presented and corresponding references to the published results are denoted. A detailed analysis of these results can be found in the respective references.…”