The Accelerated Corrosion of Elemental Sulfur for Carbon Steel in Wet H2S Environment

Zheng, Shu Qi; Li, Chun Yu; Chen, Chang Feng

doi:10.4028/www.scientific.net/AMM.117-119.999

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The Accelerated Corrosion of Elemental Sulfur for Carbon Steel in Wet H₂S Environment

Abstract:

The accelerated corrosion action of sulfur for carbon steel in wet H₂S environment was studied by simulating the actual serviced environment. The weight-loss method, SEM, EDS and X-ray diffraction techniques are used to analyze the corrosion rate, the structure and the composition of the corrosion production formed in the environments. The results show that sulfur aggravated the corrosion sharply in wet H₂S environment.

Info:

Periodical:

Applied Mechanics and Materials (Volumes 117-119)

Main Theme:

Materials and Computational Mechanics

Edited by:

Huixuan Zhang, Ye Han, Fuxiao Chen and Jiuba Wen

Pages:

999-1002

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.117-119.999

Citation:

S. Q. Zheng et al., "The Accelerated Corrosion of Elemental Sulfur for Carbon Steel in Wet H₂S Environment", Applied Mechanics and Materials, Vols. 117-119, pp. 999-1002, 2012

Online since:

October 2011

Authors:

Shu Qi Zheng, Chun Yu Li, Chang Feng Chen

Keywords:

L360QS, P110S, Sulfur, Wet H₂S Environment

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$38.00

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References

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Paper TitlePages

The Improvement of Corrosion Resistant for the Cf/Al Composites by Ni-P Coatings

Authors: Chun Yu Wang, Gao Hui Wu, Peng Chao Kang, Yun He Zhang, Zi Yang Xiu, Guo Qin Chen

Abstract: Improved corrosion resistance of carbon fiber reinforced aluminum (Cf/Al) matrix composites can be achieved by applying appropriate coatings, and the electroless plating nickel-phosphor (Ni-P) coatings on the Cf/Al composites was provided in this paper. It has been founded that the pretreatment with zinc dipping solution for the electroless plating Ni-P can be approved perfect coatings on the Cf/Al composites. The EDS lines scanning results that the length of Ni-P coating is about 12 +m. In zinc dipping bath, matrix Al alloy surface could catch hold of action points for depositing Ni-P with substitution reaction, however, carbon fibers surface only have adsorption action points from zinc dipping bath, then, Ni-P alloys could deposit on the Al surface or carbon fibers. The uncoated and coated composites samples immersed in 3.5 wt % NaCl solution to contrast. The pitting corrosion behavior of the uncoated composites destroyed materials, therefore, the coated sample appeared pitting only on the surface. The corrosion resistance mechanisms of Ni-P coatings came from inhabiting the formation of the classical galvanic corrosion, additionally, the Ni-P coating was amorphous structure, there was not grains boundary which is sensitive for the corrosion reaction, so the corrosion resistant of Cf/Al composites were improved.

1675

Research on Corrosion Behavior of Fe-B Eutectic Alloy in Liquid Zinc

Authors: Rui Na Ma, Sha Sha Jin, Hong Yun Li

Abstract: The static constant corrosion tests on Fe-B eutectic alloy are investigated in liquid zinc at 500°C. The systematic observation and research of the corrosion layer are performed using SEM, TEM, XRD. The results show that corrosion resistance of Fe-B eutectic alloy in liquid zinc is perfect. Corrosion products are Fe3B and FeZn7. The corrosion layer is regular, the structure of which is hollow dendritic skeleton and the thickness of which increases with the corrosion time extending. Corrosion process is that the interdiffusion of ferro and zinc atomic results in corrosion layer formation and the corrosion layer ruptures and dissolves under the action of thermal stress and impact stress of liquid zinc. The process repeating leads to the failure of the matrix eventually.

805

Corrosion Resistance of Fe-B Alloys Immersed in Molten Zinc Bath

Authors: Xiao Ming Cao, Peng Fei Yin, Rui Na Ma

Abstract: Fe-B alloys with different boron contents were dipped into a pure molten zinc bath to investigate their anti-corrosion property. Scanning electron microscope (SEM) and energy dispersive spectrum(EDS) were used to detect the corrosion products. It is found that the corrosion mechanism of α phase is corrosion and dissolution ,while the Fe2B phase is crack mechanism because of its brittleness and excellent corrosion resistance.The Fe2B phase in eutectic structure can protect the matrix from molten zinc and restrict the reaction of Fe-Zn. With the increase of boron content, the corrosion resistance performance of the alloys improves gradually.

3051

Effect of Passivation on Pitting Corrosion of 316L Stainless Steel in Concentrated Seawater

Authors: Feng Jun Lang, Ying Ma, Jian Rong Liu, Xian Qiu Huang, Mou Cheng Li

Abstract: The influence of passivation on pitting corrosion of 316L stainless steel in concentrated seawater was investigated by using cyclic anodic polarization and critical pitting temperature. The results indicated that the pitting potential of passivated specimen was higher than that of matrix specimen in concentrated seawater at 25°C and 85°C. Critical pitting temperature value of passivated specimen was 56°C, which was much higher than 11°C for matrix specimen. Pitting corrosion occurred in the formed pit of passivated specimen, and metastable pit, lacy cover and new pit were observed in pit morphology.

127

Technical and Performance Study of Ti-Sn Composite Chemical Conversion Coating on Aluminum Alloy

Authors: Yan Bo Wu, Xiao Xi Wang, Ting Lou, Tie Ben Song

Abstract: SnSO4 and TiOSO4 were chosen in this paper as the main salts for preparing composite chemical conversion coating on aluminum alloy. The scope of this paper is to find out the optimal experiment process, the performance of Ti-Sn composite chemical conversion coating and tentative to analysis the microstructure of this chemical conversion coating. The optimal conditions of the concentration ratio of TiOSO₄ and SnSO₄ was 0.4g/L, 0.4g/L, KMnO₄ 1.0g/L, NaF 1.0g/L, reaction temperature 50°C、reaction time was 3min. And then different methods were used to study the performance and microstructure of the conversion coating.

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