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51316-7319-Effect of Elements Mo and W on Humidity Corrosion of Low Alloy Steels in H2S-Containing Environment

The effect of Tungsten (W) and Molybdenum (Mo) on the corrosion behavior of low alloy steels exposed to acid humidity corrosion environment containing O2, H2S, and CO2 was investigated using weight loss, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and electrochemical measurements.

Product Number: 51316-7319-SG
ISBN: 7319 2016 CP
Author: Wei Liu
Publication Date: 2016
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The effect of Tungsten (W) and Molybdenum (Mo) on the corrosion behavior of low alloy steels exposed to acid humidity corrosion environment containing O2, H2S, and CO2 was investigated using weight loss, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and electrochemical measurements. The results indicate that both addition of W and Mo can improve corrosion resistance of low alloy steels, and the enhancement effect of W is better than Mo. Surface layers are mainly composed of FeOOH, Fe3O4, and small amount of S and Fe2 (SO4)3·nH2O. Mo and W element in steels can be oxidized into MoO2, MoO3, and WO3, respectively, which can act as corrosion inhibitor during corrosion process. Mo steel have lower corrosion resistance than W steel, because the chemical transformation from MoO2 to MoO3 may form defects inside surface layers, and the smaller molecular mass and volume of MoO3 than WO3 makes MoO3 easier to move in surface layers and lower the resistance of anodic dissolution.

Key words: Downloadable, W, Mo, O2-H2S-CO2, humidity corrosion

The effect of Tungsten (W) and Molybdenum (Mo) on the corrosion behavior of low alloy steels exposed to acid humidity corrosion environment containing O2, H2S, and CO2 was investigated using weight loss, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and electrochemical measurements. The results indicate that both addition of W and Mo can improve corrosion resistance of low alloy steels, and the enhancement effect of W is better than Mo. Surface layers are mainly composed of FeOOH, Fe3O4, and small amount of S and Fe2 (SO4)3·nH2O. Mo and W element in steels can be oxidized into MoO2, MoO3, and WO3, respectively, which can act as corrosion inhibitor during corrosion process. Mo steel have lower corrosion resistance than W steel, because the chemical transformation from MoO2 to MoO3 may form defects inside surface layers, and the smaller molecular mass and volume of MoO3 than WO3 makes MoO3 easier to move in surface layers and lower the resistance of anodic dissolution.

Key words: Downloadable, W, Mo, O2-H2S-CO2, humidity corrosion

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