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

Manuela Nimmervoll,Gregor Mori,Alexander Schmid,Roland Haubner,Edith Bucher

doi:10.3390/met11111817

Manuela Nimmervoll, Gregor Mori + Show 3 more

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https://doi.org/10.3390/met11111817

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Journal: Metals	Publication Date: Nov 12, 2021
Citations: 1	License type: CC BY 4.0

Affiliation: Montanuniversität Leoben, OMV (Austria), TU Wien

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.

Highlights

High-temperature corrosion in mixed gas atmospheres is a problem of many industrial processes, e.g., ethylene dichloride production, gasification of biomass, coal, or waste
SEM images and corresponding EDX mappings of metallographic cross sections of N10276 after corrosion tests at 480 ◦C and 680 ◦C are shown in Figures 4 and 5
The material N10276 was tested under conditions simulating a thermal cracking process of anthropogenic resources

Summary

Introduction

High-temperature corrosion in mixed gas atmospheres is a problem of many industrial processes, e.g., ethylene dichloride production, gasification of biomass, coal, or waste. If the partial pressure of oxygen is high enough and the materials can form protective oxide layers, the corrosion resistance of the materials increases. Above 400 ◦C, chlorine or low molecular chlorine containing compounds, such as HCl, can migrate through the initial, protective oxide layer. There, they can form volatile metal chlorides with the base material. These metal chlorides can evaporate leading to porous and non-protective corrosion products [1,2,3,4,5,6,7]

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