Effect of Nb on corrosion behavior of simulated weld HAZs of X80 pipeline steel in simulated seawater environments corresponding to shallow sea and deep sea

Zihao Wang, Yunhua Huang, Jia Li, Lang Yang, Donghan Xie

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The simulated intercritical HAZ (ICHAZ), fine grained HAZ (FGHAZ) and coarse grained HAZ (CGHAZ) of weld joints for two Nb containing steels were prepared by means of heat treatment. Then their microstructure and distribution of nano-sized precipitates were characterized by means of optical microscopy and transmission electron microscopy. Their corrosion behavior in simulated seawater environments corresponding to shallow sea and deep sea of 600 m below sea level respectively were studied by conventional electrochemical techiques and immersion tests. It’s shown that the corrosion rate of ICHAZ and CGHAZ is much higher than that of FGHAZ. What’s more, with the addition of Nb, the microstructural homogeneity of the steel is improved and the corrosion products films formed on the steels become much compact, thus enhancing their corrosion resistance. Besides, the nano-sized NbC precipitates can act as traps for capturing hydrogen, thus enhancing their corrosion resistance also in the seawater of deep sea.

Original languageEnglish
Pages (from-to)604-610
Number of pages7
JournalJournal of the Chinese Society of Corrosion and Protection
Volume36
Issue number6
DOIs
Publication statusPublished - 2016 Dec
Externally publishedYes

Keywords

  • Corrosion behavior
  • Deep seawater
  • HAZ
  • Nb
  • Shallow seawater

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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