The study of mechanism for microbiological on steel using for corrosion by electrochemical method

Name: Phuri Kalnaowakun

LCSH: Kasetsart University -- Dissertations. Ph.D. (Materials Engineering) 2020

Classification :.LCCS: TA418.74

LCSH: Kasetsart University. -- Department of Materials Engineering -- Dissertations

LCSH: Microbiologically influenced corrosion

LCSH: Corrosion resistant materials

LCSH: Corrosion and anti-corrosives

LCSH: Fouling

LCSH: Marine bacteria

Abstract: The aim of this study in especially corrosion used by microorganisms, which called microbiologically influenced corrosion (MIC), is accelerated pitting corrosion on steels or other materials such as 316Lstainless steel (316L SS), 316L stainless steel with copper (316L-Cu SS) and applied in electrochemical techniques for corrosion behavior. Prior to the corrosion investigations, the specimens and microorganisms like Pseudoalteromonas lipolytica (P. lipolytica) and Shewanella algae (S. algae) were supported by the Institute of Metal Research (IMR), Chinese Academy of Sciences (Shenyang, China) in this study. The electrochemical technique used to study the corrosion mechanisms which using in the function to start from open-circuit potential (Eocp), linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS) and potentiodynamic (PD) polarization tests was performed. Moreover, the surfaces analysis were investigated by scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) and confocal laser scanning microscopy (CLSM) to study in the morphologies of biofilm. The SEM and CLSM images show that the microorganisms which affected thickness and dense of biofilms by increased and decreased on 316L SS or 316L-Cu SS after 7 days and 14 days of incubation time. The EDX images show that the elemental composition between raw materials and incubated bacteria as P. lipolytica and S. algae which used to the nutrient’s depletion in this experiment. CLSM images of pitting corrosion shows that the accelerated corrosion of 316L SS or 316L-Cu SS in both of two bacteria were measured during the 14 days of incubation time. In addition, the results of electrochemical data was studied in P. lipolytica and S. algae biofilm induced the corrosion rate of this material. Up until now, there is very less information known on the formation of biofilms and their corrosive effect of two bacteria on stainless steel.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Aphichart Rodchanarowan

Role: Thesis Advisor

Created: 2020

Modified: 2025-07-11

Issued: 2025-07-11

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2563/phuri-kal-all.pdf

CallNumber: TA418.74 .P48

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degraee

Descipline: Materials Engineering

Grantor: Kasetsart University

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