Effect of Decarburization Heat Treatment and Chromium Addition on Corrosion Behavior of Carbon Steel

Shin, Ho‐Sang; Kim, S. W.; Kim, H.-P.; Park, J. K.

doi:10.5006/1.3319137

CORROSION

2009

DOI: 10.5006/1.3319137

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Effect of Decarburization Heat Treatment and Chromium Addition on Corrosion Behavior of Carbon Steel

Ho‐Sang Shin

S. W. Kim

H.-P. Kim

et al.

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Pitting susceptibility of induction-quenched pipeline with microstructural heterogeneity

Luo

et al. 2012

J Mater Sci

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Pitting corrosion was found to be the immature failure mechanism for a slurry pipe that has an internal surface hardened with induction-quenching technique. The metallographic examination shows that the microstructure of surface layer is a banded mixture of martensite, ferrite, and pearlite. The pits initiate preferably in the ferrite bands. Electrochemical measurements are conducted to evaluate the pitting susceptibility of each constituent. When the small amount of chloride is present, the breakdown potential of ferrite is lower than those of martensite and pearlite. The high likelihood of metastable pit initiation in ferrite is also demonstrated by the electrochemical noise records. The development of pits in ferrite in the mixed microstructure is further promoted by the galvanic effect when ferrite is coupled with pearlite or martensite. The passive film of steel is an n-type semiconductor. The Mott-Schottky measurements indicate that the passive film formed on the ferrite specimen contains more oxygen vacancies, suggesting that the lower breakdown resistance is likely due to a highly defective film structure. The high-to-low pitting susceptibility is ferrite [ martensite [ pearlite. The experimental observations of this study imply that a practical approach to improve the performance of tailing pipes is to eliminate the microstructural heterogeneity in the surface layer by modifying the induction-heating process.

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Pitting susceptibility of induction-quenched pipeline with microstructural heterogeneity

Luo

et al. 2012

J Mater Sci

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Long term localised corrosion of marine steel piling welds

Chaves

Melchers

2013

Corrosion Engineering, Science and Technology

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Localised or pitting corrosion can be detrimental for steel pipes and containment structures, since wall perforation may cause system failure. Herein maximum pit depth quantification and its development with time are considered for samples taken from longitudinal welds on 33-year-old tubulars exposed in Newcastle Harbour. Relationships between pit depth and material metallurgy and corrosion properties were investigated by means of standard macro-etching, rest potential and zero resistance ammetry techniques. It is considered that the observed results are the result of the lack of homogeneity at the corrosion interface caused by differences in grain size, grain structure and the potential for pitting to occur preferentially along boundaries. The results are compared to measurements for longitudinal welds obtained previously on samples of API X56 Spec 5L pipe exposed in similar waters for up to 3?5 years, showing a reasonable degree of consistency between the two sets of data. The reasons for this are discussed.

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Effect of Residual Stress of Dissimilar Metal Welding on Stress Corrosion Cracking of Bottom-Mounted Instrumentation Penetration Mock-Up

Kim¹,

Kim²,

Jeong³

et al. 2010

CORROSION

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Effect of Decarburization Heat Treatment and Chromium Addition on Corrosion Behavior of Carbon Steel

Cited by 3 publications

References 0 publications

Pitting susceptibility of induction-quenched pipeline with microstructural heterogeneity

Pitting susceptibility of induction-quenched pipeline with microstructural heterogeneity

Long term localised corrosion of marine steel piling welds

Effect of Residual Stress of Dissimilar Metal Welding on Stress Corrosion Cracking of Bottom-Mounted Instrumentation Penetration Mock-Up

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