Electrochemical study of stainless steel corrosion by marine sulphate-reducing bacteria

Fathul Karim Sahrani, Zaharah Ibrahim, Madzlan Abd Aziz, Adibah Yahya

Research output: Contribution to journalArticle

Abstract

Corrosion caused by sulphate-reducing bacteria (SRB) isolated from seawater nearby to Pasir Gudang has been studied. The test coupon was a AISI 304 stainless steel. Potential and corrosion rate measurements were carried out in various types of culturing solutions, with SRB1, SRB2, combination of SRB1 & SRB2 and without SRBs inoculated (sterilized). From Tafel plots a higher corrosion rate has been found in medium inoculated with SRBs than that of the sterilized medium (control). When SRBs were present in the medium, the Tafel plot shifted towards more negative values (Ecorr was shifted to much less anodic values) and increase in current density compared to that of the sterilized medium (control). Localized corrosion was observed on the metal surface, and it was associated to the SRB activity. X-ray analysis (EDAX) showed that the corrosion product has higher content of sulphur for medium containing SRBs than that of the sterilized medium. X-ray diffraction analysis carried out on corrosion products which showed the presence of iron sulphide. This indicates the influence of the presence of SRB in corrosion process.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalSains Malaysiana
Volume37
Issue number2
Publication statusPublished - Jun 2008

Fingerprint

Steel corrosion
Stainless Steel
Sulfates
Bacteria
Corrosion
Corrosion rate
X ray analysis
Sulfides
Seawater
Sulfur
X ray diffraction analysis
Energy dispersive spectroscopy
Current density
Iron
Metals

Keywords

  • Electrochemical test
  • Stainless steel
  • Sulphate-reducing bacteria
  • Tafel plots

ASJC Scopus subject areas

  • General

Cite this

Electrochemical study of stainless steel corrosion by marine sulphate-reducing bacteria. / Sahrani, Fathul Karim; Ibrahim, Zaharah; Aziz, Madzlan Abd; Yahya, Adibah.

In: Sains Malaysiana, Vol. 37, No. 2, 06.2008, p. 155-160.

Research output: Contribution to journalArticle

Sahrani, Fathul Karim ; Ibrahim, Zaharah ; Aziz, Madzlan Abd ; Yahya, Adibah. / Electrochemical study of stainless steel corrosion by marine sulphate-reducing bacteria. In: Sains Malaysiana. 2008 ; Vol. 37, No. 2. pp. 155-160.
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