Corrosion Behavior of Cast Iron in Freely Aerated Stagnant Arabian Gulf Seawater

• Published in: Materials Vol. 8; no. 5; pp. 2127 - 2138
• Main Authors: Sherif, El-Sayed M, Abdo, Hany S, Almajid, Abdulhakim A
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.05.2015; MDPI
• Subjects: Alloys; Arabian Gulf seawater; Cast iron; Corrosion; Corrosion rate; Corrosion resistance; Corrosion tests; Electrochemical impedance spectroscopy; electrochemical measurements; Immersion; Investigations; Nodular cast iron; Polarization; Scanning electron microscopy; Sea water; Seawater; weight-loss; Saudi Arabia; Riyadh Saudi Arabia; Egypt
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma8052127

In this work, the results obtained from studying the corrosion of cast iron in freely aerated stagnant Arabian Gulf seawater (AGS) at room temperature were reported. The study was carried out using weight-loss (WL), cyclic potentiodynamic polarization (CPP), open-circuit potential (OCP), and electrochemical impedance spectroscopy (EIS) measurements and complemented by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) investigations. WL experiments between two and 10 days' immersion in the test electrolyte indicated that the weight-loss the cast iron increases with increasing the time of immersion. CPP measurements after 1 h and 24 h exposure period showed that the increase of time decreases the corrosion via decreasing the anodic and cathodic currents, as well as decreasing the corrosion current and corrosion rate and increasing the polarization resistance of the cast iron. EIS data confirmed the ones obtained by WL and CPP that the increase of immersion time decreases the corrosion of cast iron by increasing its polarization resistance.