Research Papers Session 2
 
18 August, Thursday - Perak Room - 1:30pm - 3:15pm

Chair : Prof. Minxu Lu, University of Science and Technology Beijing

Some Schiff’s Bases as Green Corrosion Inhibitor for Mild Steel in 1 M HCl: Electrochemical, Surface and Theoretical Investigation

18 August, Thursday - Perak Room - 1:35pm - 2:05pm

Bio of Speaker

Abstract

In present study two of the Schiff’s bases namely 2-amino-6-(phenylallylidene)amino)hexanoic acid (LSB-1) and 2-amino-6-((4-nitrobenzylidene)amino) hexanoic acid (LSB-2) were synthesized by condensing Lysine with two different aldehydes and their corrosion inhibition efficiency were evaluated on mild steel (MS) in 1 M HCl using weight loss, electrochemical, surface and theoretical study methods. Results showed that inhibition efficiency of studied LSBs increases with increasing concentration. Among the studied inhibitors LSB-1 showed the highest inhibition efficiency of 97.2% at 400 ppm concentration. Tafel polarization measurements show that the presence of LSBs in acid solution affects both cathodic and anodic reactions but acts as predominantly cathodic type inhibitor. The Scanning electron microscopy (SEM) and atomic force microscopy (AFM) studies suggest the formation of adherent layer of LSBs on mild steel surface. The results of theoretical calculations were found to be consistent with the chemical and electrochemical results.

Corrosion Mechanism: Effect of Aggressive Anions on Carbon Steel Coated with Cermet Alloy

18 August, Thursday - Perak Room - 2:10pm - 2:40pm

Bio of Speaker

Abstract

Name:  Muhamad Azrin Bin Mohd Khalid
Title / Position:  Student
Company:  University Tun Hussein Onn Malaysia (UTHM)
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My name is Muhamad Azrin and I was born on 17 Mac 1993. Currently, I am a final year student of Mechanical Engineering at University Tun Hussein Onn Malaysia (UTHM). In the UTHM, I had done the research about Corrosion Mechanism: Effect of Aggressive Anions to Cermet Coating on Carbon Steel under supervisor Dr. Azzura Bt Ismail. This research was conduct to give information to engineer about corrosion on cermet coating due to anions present in seawater.
  
This research study evaluated the corrosion mechanism attack on carbon steel coated with cermets alloys (WC-9% Ni) in seawater at different sulphate-to-chloride ratio. The four different sulphate-to-chloride was synthesis with same salinity of seawater, 3.5% and same pH of real seawater. The corrosion tests involved are immersion and electrochemical test. The immersion test is use to determine the cermets coating ability to withstand the corrosion attack based on different ratio of anions present in the seawater at different period of immersion. The corrosion attack was characterized by optical and Scanning Electron Microscope (SEM). The aggressive anions present in the seawater influence the corrosion attack on the cermets coating. For immersion test, results reveal that highest amount of sulfate increased the corrosion attack on cermets coating. From electrochemistry analysis shows the passive layer form on cermets coating prevent the material from further corrosion attack. However, due to porous passive layer, the passive layer collapse and exposed the material for another corrosion reaction. For electrochemical, the result shows that the solution with sulphate-to-chloride ratio=0.14 (real seawater) has the highest corrosion rate and pitting potential compare to other solutions (different sulphate-to-chloride ratio). In conclusion, sulfate and chloride shows their competition to attack the cermets coating on carbon steel and the higher amount of chloride present is seawater, the higher corrosion rate and pits form on the cermets coating.

Research on Material Selection of CRAs for Sour Corrosion Conditions

18 August, Thursday - Perak Room - 2:45pm - 3:15pm

Bio of Speaker

Abstract

Name: Feng Cai
Title / Position:  Doctor
Company:  Safetech Research Institute

Dr. Feng Cai serves as manager of marketing department at Safetech Research Institute (SRI). He received Ph.D. degree at University of Science and technology Beijing in 2013. During his Ph.D. career, He had two-years visiting experience at Norwegian University of Science and Technology (NTNU). His research focused on internal multiphase corrosion, erosion-corrosion and anti-corrosion coating for pipeline, material selection of CRAs for Sour Corrosion Conditions. He has almost 10 years work experience and always keeps close relationship with oil &gas industry, such as CNOOC, PetroChina and Sinopec. And he is also an active NACE member in the EAP area, and has served as past Secretary of NACE Shanghai Section (2012-2013).
In this paper, the critical environment parameters for translation of passivation characteristics and the sensitive sour environments of Corrosion Resistant Alloys (CRAs) were obtained by using cyclic polarization measurements coupled with HTHP corrosion simulation tests, which based on the analysis of corrosion risks in sour environments and the understanding of the recommended application range of CRAs according to NACE MR 0175 / ISO 15156. The fitness-for-service of several types of CRAs under sensitive sour environments was evaluated by using different types of results from long-period simulative corrosion tests, which judge a failure of CRA based on cracking, pitting, or damage of the passive film, and the boundary map for fitness-for- service of CRAs under sour environments was proposed based on the establishment of Pass/Fail criteria.