Generation of Stress Corrosion Cracking Environments at Pipeline Surfaces

Charles, E.A.; Parkins, R. N.

doi:10.5006/1.3294372

Cited by 65 publications

(31 citation statements)

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“…While the coating provides the first line of protective barrier, CP serves as a backup to prevent corrosion attack either at coating faults such as pinholes and holidays or under coating disbondment [1][2][3][4][5]. However, pipeline corrosion and corrosion induced cracking have been widely documented [6][7][8]. When coating is disbonded at small faults, such as pinholes or holidays, CP current can be shielded, either fully or partially, to reach the disbonding crevice, especially at the crevice bottom.…”

Section: Introductionmentioning

confidence: 99%

Study of cathodic protection shielding under coating disbondment on pipelines

Kuang

Cheng

2015

Corrosion Science

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Section: Introductionmentioning

confidence: 99%

Study of cathodic protection shielding under coating disbondment on pipelines

Kuang

Cheng

2015

Corrosion Science

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“…and these chlorides are often a source of the chloride ions required for chloride SCC in austenitic steels [9,10]. The chloride ions promote SCC even when the temperature is low, the water is at a near neutral pH and the stresses on the steel are low [11,12]. Spectroscopy of the tank material revealed AISI 304 SS grade which is very susceptible to SCC in the presence of tensile stresses and specific environment (see Table 1).…”

Section: Discussionmentioning

confidence: 99%

Failure Analysis of AISI-304 Stainless Steel Styrene Storage Tank

Asghar

Tariq

Ali

2010

J Fail. Anal. and Preven.

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This paper presents the failure analysis of AISI-304 stainless steel tank that was fabricated by welding and used for the storage of styrene monomers. After about 13 years of satisfactory operation, significant cracking was observed adjacent to the weld joints and in base plate near tank foundation. Weld repair was by shielded gas arc welding using AISI 308 stainless steel filler wire. The failed base plate was replaced with the new AISI 304 base plate of same thickness. After a short period of time, seepage was observed along the weld bead. Upon nondestructive testing cracks were found in the heat-affected zone and in the base plate. The failure investigation was carried out on welded and base plate samples using spectroscopy, optical and scanning electron microscopy, fractography, SEM-EDS analysis, microhardness measurements, tensile and impact testing. The results revealed transgranular cracks in the HAZ and base plate, and the failure was attributed due to stress corrosion cracking. Cracks initiated as a result of combined action of stresses developed during welding and the presence of a chloride containing environment due to seawater. It was further observed that improper welding parameters were employed for weld repair which resulted in sensitization of the structure and postweld heat treatment to remove weld sensitization and minimize the residual stresses was not done.

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“…Charles and Parkins (1995) showed that by raising the temperature of the NS4 solution and by applying a cathodic current not only is a high pH solution created but a higher ionic solution is created due to increased evaporation. They assert that this might be an additional role of temperature in classical SCC and why classicai SCC occurs near the discharge of cornpressor stations.…”

Section: Resultsmentioning

confidence: 99%

Effect of Microstructure on Near-Neutral-pH SCC

Bulger

Luo

2000

Volume 2: Integrity and Corrosion; Offshore Issues; Pipeline Automation and Measurement; Rotating Equipment

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Three components are required for stress corrosion cracking: stress, an environment and a susceptible alloy. The environment that causes near-neutral-pH SCC has been established as a dilute bicarbonate environment and the effect of stress on this type of SCC has received a considerable amount of research; however, the third component, the susceptible alloy, has received little research. The effect of microstructure on near-neutral-pH SCC was investigated using the slow strain rate test. The effect of the microstructure on the corrosion properties is also investigated using polarization resistance tests, potentiodynamic scans and electrochemical impedance spectroscopy. The results indicate that the microstructure influences both the SCC and corrosion behaviour.

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Generation of Stress Corrosion Cracking Environments at Pipeline Surfaces

Cited by 65 publications

References 0 publications

Study of cathodic protection shielding under coating disbondment on pipelines

Study of cathodic protection shielding under coating disbondment on pipelines

Failure Analysis of AISI-304 Stainless Steel Styrene Storage Tank

Effect of Microstructure on Near-Neutral-pH SCC

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