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Mechanistic Study of the Effect of Iron Sulfide Layers on Hydrogen Sulfide Corrosion of Carbon Steel

Picture for Mechanistic Study of the Effect of Iron Sulfide Layers on Hydrogen Sulfide Corrosion of Carbon Steel
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Product Number: 51315-5933-SG
ISBN: 5933 2015 CP
Author: Yougui Zheng
Publication Date: 2015
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Glass cell experiments were conducted to investigate effect of FeS scale growth on H?S corrosion of carbon steel. Tests were conducted by purging 10% H?S/N2 into 1 wt. % NaCl solution at different temperature (25oC-80oC) different pH (pH4 to pH6) and different flow conditions (60rpm and 600rpm magnetic stirring rates). The exposure period was from 1day to 6 days. The corrosion behavior was monitored by LPR and checked with weight loss analysis. The morphology and compositions of surface corrosion products was analyzed by Scanning Electron Microscopy (SEM/EDS) Cross section analysis and X-ray Diffraction methodology (XRD). The results show the balance between FeS precipitation and undermining process can lead to a variety of corrosion outcome depending on the environmental parameters such as temperature pH flow rate. Protective corrosion product layer and low corrosion rate were observed at high pH temperature and low flow rate due to formation of dense films. The present results also confirm that the concept of scaling tendency is a good tool for predicting the likelihood of protective iron sulfide layer formation.
Glass cell experiments were conducted to investigate effect of FeS scale growth on H?S corrosion of carbon steel. Tests were conducted by purging 10% H?S/N2 into 1 wt. % NaCl solution at different temperature (25oC-80oC) different pH (pH4 to pH6) and different flow conditions (60rpm and 600rpm magnetic stirring rates). The exposure period was from 1day to 6 days. The corrosion behavior was monitored by LPR and checked with weight loss analysis. The morphology and compositions of surface corrosion products was analyzed by Scanning Electron Microscopy (SEM/EDS) Cross section analysis and X-ray Diffraction methodology (XRD). The results show the balance between FeS precipitation and undermining process can lead to a variety of corrosion outcome depending on the environmental parameters such as temperature pH flow rate. Protective corrosion product layer and low corrosion rate were observed at high pH temperature and low flow rate due to formation of dense films. The present results also confirm that the concept of scaling tendency is a good tool for predicting the likelihood of protective iron sulfide layer formation.
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