Corrosion failure analysis of duplex stainless steel in marine environment

Serious crevice corrosion was detected at wear ring and pump casing of an S32760 duplex stainless steel fire pump assembled on an offshore platform, which resulted in broken of the wear ring. The failure mechanism of the cracked wear ring was analyzed, and results showed that the chemical compositio...

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Bibliographic Details
Published inInternational journal of electrochemical science Vol. 17; no. 5; p. 22055
Main Authors Wang, Haipeng, Yang, Yang, Yang, Zhongna, Xu, Zhigang, Chai, Yuanyuan, Zhang, Zhuwu
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2022
Subjects
crevice corrosion
fire pump
S32760
stainless steel
X-ray spectrometry
X-ray spectrometry
stainless steel
fire pump
crevice corrosion
S32760
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Summary:Serious crevice corrosion was detected at wear ring and pump casing of an S32760 duplex stainless steel fire pump assembled on an offshore platform, which resulted in broken of the wear ring. The failure mechanism of the cracked wear ring was analyzed, and results showed that the chemical composition of the wear ring corresponds to the standard S32760. However, metallographic test results showed that the wear ring has many harmful σ-phases and inclusions in the matrix, which led to the decrease of corrosion resistance of the material and induced crevice corrosion at the bolt joint and the wear ring. Besides, Chloride, sulfide, sodium and potassium have been found at corrosion products and pump casing fragments through energy dispersive X-ray spectrometry. Thus, to extend the service life of the fire pump, better sealing measures are needed to prevent crevice corrosion.
ISSN:1452-3981
1452-3981
DOI:10.20964/2022.05.52