Sains Malaysiana 37(4): 359-364(2008)

Open Circuit Potential Study of Stainless Steel in Environment

Containing Marine Sulphate-Reducing Bacteria

(Kajian Keupayaan Litar Terbuka Terhadap Keluli Tahan Karat dalam

Persekitaran yang Mengandungi Bakteria Penurun-Sulfat Marin)

Fathul Karim Sahrani

PPSSSA, Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E. Malaysia

Madzlan Abd. Aziz, Zaharah Ibrahim & Adibah Yahya

Jabatan Kimia / Biologi, Fakulti Sains

Universiti Teknologi Malaysia

81310 UTM Skudai, Johor D.T. Malaysia

Received:  25 July 2007 / Accepted:  25 January 2008

ABSTRACT

The corrosion potential of AISI 304 stainless steel coupons influenced by sulphate-reducing bacteria (SRB) has been studied. Pure colony of SRB was isolated from the Malaysia Marine and Heavy Engineering, Pasir Gudang, Johor. Open circuit potential measurements were carried out in variable types of culturing solutions with SRB1, SRB2, combination of SRB1 & SRB2 and without SRBs inoculated. Results showed that the corrosion potential, E_oc increased in the presence of SRBs (in pure and mixed culture) compared to that of control. EDS analysis showed the strong peak of sulphur in coupon containing SRB cultures compared to the control. ESEM data showed  that the high density cell of SRBs were associated with corroding sections of surface steel comparing with non-corroding sections for coupons immersed in VMNI medium containing SRBs.

Keywords: open circuit potential; stainless steel; sulphate-reducing bacteria

ABSTRAK

Keupayaan kakisan kupon keluli kalis karat bersiri 304 yang dipengaruhi oleh bakteria penurun-sulfat (SRB) telah dikaji. Koloni tulen SRB telah dipencilkan dari Kejuruteraan Berat dan Marin Malaysia, Pasir Gudang Johor. Pengukuran keupayaan litar terbuka telah dijalankan dalam berbagai-bagai-bagai jenis larutan pengkulturan menggunakan SRB1, SRB2, kombinasi SRB1 dan SRB2 serta larutan tanpa kultur SRB. Keputusan menunjukkan keupayaan kakisan, E_oc meningkat dengan kehadiran SRB (dalam kultur tulen dan gabungan kultur) berbanding kawalan. Analisis EDS menunjukkan puncak sulfur yang tinggi dalam kupon yang mengandungi kultur SRB berbanding kawalan. Data dari mikroskop elektron imbasan sekitaran (ESEM) menunjukkan kepadatan sel SRB yang tinggi berasosiasi di bahagian permukaan keluli yang karat berbanding bahagian yang tidak berkarat bagi kupon yang direndam dalam larutan VMNI yang mengandungi SRB.

Kata kunci: bakteria penurun-sulfat; Keluli kalis karat; keupayaan litar terbuka 

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