Effects of Hydrogen Chloride and of Nitrogen in the Oxidation of Fe-20Cr

Bramhoff, D.; Grabke, H. J.; Schmidt, Harald

doi:10.1007/978-94-009-1147-5_22

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…Those can reenter the reaction cycle and act autocatalytic. This formation of voluminous and non-protective oxide layers leads to continuous metal loss due to chlorination and subsequent oxidation of the metal chlorides [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Metallographic Documentation of the Degradation of Iron and Nickel Based Alloys in HCl and H<sub>2</sub>S Containing Environments, between 480 – 680 °C

Schmid¹,

Mori²,

Haubner

2020

DDF

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Corrosion behavior of the alloys 1.7386 (P9), 1.4462, 1.4841, 1.4959 (Alloy 800HT) and 2.4816 (Alloy 600) was tested for 24, 72 and 240 h between 480 – 680 °C. The testing gas atmosphere contained 3.8 vol. % HCl, 200 ppm H2S and CO, CO2 and N2. It simulated conditions present in a thermal cracking process for post-consumer plastics. Samples were analyzed by metallography, SEM/EDX and XRD after corrosion experiments. Additionally, their mass loss during the test was evaluated. A multilayered structure of corrosion products grew on the samples during the corrosion experiments. The composition of the corrosion products depended not on the material, but on the testing temperature. At 680 °C chromium sulphide formed the outer layer, followed by a chromium oxide layer. Below these two layers a chlorine containing layer was observed. At 480 °C mainly nickel sulphide was detected, besides chromium oxide and iron- and chromium chloride. Especially at higher testing temperatures FeCl2 was not observed directly on the samples, but as colorless crystals at the colder parts of the testing equipment. At 680 °C the mass loss of the samples decreased with increasing nickel content. However, this effect changed entirely at lower testing temperatures. At 480 °C 1.7386 and 2.4816 showed nearly the same mass losses.

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Section: Introductionmentioning

confidence: 99%

“…Fe is known as a detrimental alloying element in HCl containing environments, due to the high volatility of Fe chlorides. Because of the much lower volatility of NiCl2, Ni has a positive effect [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Metallographic Documentation of the Degradation of Iron and Nickel Based Alloys in HCl and H<sub>2</sub>S Containing Environments, between 480 – 680 °C

Schmid¹,

Mori²,

Haubner

2020

DDF

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

Nimmervoll

Mori

Bucher

et al. 2022

Materials & Corrosion

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High-temperature corrosion mechanisms in reducing atmospheres containing HCl (3.8 vol%) and a varying amount of H 2 S (0.02 -2 vol%) were developed for several alloys between 420°C and 680°C. These mechanisms are mainly based on practical observations and kinetic considerations-and less on thermodynamic data. This is due to the complexity of these mixed gas atmospheres, volatile corrosion products, and the ever-changing conditions within the corrosion layer, which made it not possible to predict and calculate the actual conditions in the corrosion zone. In this article, a detailed thermodynamic analysis of previously achieved corrosion mechanisms and experimental observations is presented. Correlations and deviations between thermodynamic calculations and practical findings are stated and discussed. The corrosion behavior of ferritic K90941, which performs worse than corrosionresistant austenitic alloys, except for one test condition at 580°C in the atmosphere with 0.2 vol% H 2 S, is explained and supported by thermodynamic data. By combining experiments with thermodynamics, corrosion mechanisms in reducing HCl and H2S-containing atmospheres are explained.

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Effect of Varying H2S Content on High-Temperature Corrosion of Ferritic and Austenitic Alloys in a Simulated Pyrolysis Process of Post-Consumer Plastics

Nimmervoll

Mori

Bucher

et al. 2021

Berg Huettenmaenn Monatsh

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The alloys K90941 and N08811 were tested under conditions simulating a pyrolysis process of post-consumer plastics. Impurities in the plastic feedstock like chlorine containing materials or organic components yield HCl and H2S respectively during the cracking process. The reactor material must be able to withstand these harsh corrosive conditions.In lab-scale test equipment, process conditions of the reactor zone of the pyrolysis process were simulated at temperatures of 420 °C and 580 °C for 72 h. The gas atmosphere consisted of either 200 ppm or 20000 ppm H2S and 3.8 vol% HCl, 1.9 vol% CO2, 0.3 vol% CO, 2.8 vol% H2, bal. N2. After the corrosion experiments, the samples were analyzed by metallography, SEM/EDX, and XRD. Additionally, the mass loss was evaluated. Results show that the ferritic K90941 is more aggressively attacked than the austenitic N08811 and that for both materials the mass loss rises with increasing H2S content in the gas atmosphere and increasing temperature.

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Effects of Hydrogen Chloride and of Nitrogen in the Oxidation of Fe-20Cr

Cited by 5 publications

References 9 publications

Metallographic Documentation of the Degradation of Iron and Nickel Based Alloys in HCl and H<sub>2</sub>S Containing Environments, between 480 – 680 °C

Metallographic Documentation of the Degradation of Iron and Nickel Based Alloys in HCl and H<sub>2</sub>S Containing Environments, between 480 – 680 °C

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

Effect of Varying H2S Content on High-Temperature Corrosion of Ferritic and Austenitic Alloys in a Simulated Pyrolysis Process of Post-Consumer Plastics

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