Corrosion of mild steel in sea mud containing sulphate reducing bacteria

Abstract

In this work, the corrosion behaviour of a mild steel was studied in a sea mud extracted solution in the absence and presence of sulphate reducing bacteria (SRB) by electrochemical impedance spectroscope measurements and scanning electron microscope characterisation. The presence of SRB in the sea mud extracted solution affects corrosion of steel remarkably. In the absence of SRB, the steel corrosion is somewhat inhibited by the formed corrosion product layer. However, the addition of SRB enhances corrosion of the steel due to its metabolism activity. It is speculated that the formed sulphide product may experience transformation decreasing the protectiveness of the product layer.Dans ce travail, on a étudié le comportement à la corrosion d'un acier doux dans une solution extraite de la boue marine, avec ou sans la pré sence de bactéries sulfatoré ductrices (SRB), au moyen de mesures au spectroscope de l'impé dance é lectrochimique et de la caracté risation au microscope é lectronique à balayage. La pré sence de SRB dans la solution extraite de la boue marine affecte la corrosion de l'acier de faç on remarquable. En absence de SRB, la corrosion de l'acier est quelque peu inhibé e par la couche formé e par le produit de la corrosion. Cependant, l'addition de SRB augmente la corrosion de l'acier à cause de l'activité de son mé tabolisme. L'hypothè se est que le produit sulfuré formé peut se transformer, diminuant ainsi l'effet protecteur de la couche produite.

Topographical profiles and mechanical property of corrosion product films on a pipeline steel in Desulfovibrio vulgaris-containing thin electrolyte layer characterised by atomic force microscopy

“…Adhesion of microorganisms to the pipe surface is capable of accumulating a community of bacteria, generating a layer of biofilm [22,24]. The biofilm is highly adapted for life in microbial communities by means of self-produced extra polymeric substances (EPS) [25,26], affecting corrosion of the steels [27][28][29][30]. The corrosion products are usually mixed with biofilm, especially in a TEL with a limited volume of solution.…”

Effects of temperature and applied strain on corrosion of X80 pipeline steel in chloride solutions

“…AISI 4135) and offshore platform steels [15,16]. The research topics included the hydrogen permeation [17] and microbial corrosion [18]. There has been limited work to investigate the effects of relevant parameters, i.e.…”