Advances in Surface Engineering V: Corrosion Behavior and Thin Films
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS: Surface Engineering Committee
Program Organizers: Bharat Jasthi, South Dakota School of Mines & Technology; Arif Mubarok, PPG Industries; Tushar Borkar, Cleveland State University; Rajeev Gupta, North Carolina State University

Thursday 2:00 PM
March 23, 2023
Room: 29D
Location: SDCC

Session Chair: Bharat Jasthi, South Dakota School of Mines & Technology


2:00 PM  
AlCrFe Complex Metallic Alloys as Novel and Versatile Coatings: Malgorzata Lewandowska1; Ewa Ura-Binczyk1; Michal Tarnowski1; 1Warsaw University of Technology
    Complex metallic alloys from AlCrFe system offer a unique combination of properties, such as low friction coefficient, low surface energy, high electrical resistivity, high hardness, low thermal conductivity, good oxidation and excellent corrosion resistance, which makes them very attractive and versatile coating material for both ambient and high temperature applications. In this communication, we would like to report the results of the fabrication of such coatings using magnetron sputtering. The coatings produced present very high hardness, wear as well as corrosion resistance. They were characterized in terms of microstructure and properties in question. Their adhesion to both Fe-based and Ti-based substrate were evaluated.

2:20 PM  
Synthesis of Corrosion Resistant Hexagonal Boron Nitride Coatings on Iron Substrates by Pulsed Laser Deposition: Venkata A.S. Kandadai1; Venkata Ramana Gadhamshetty1; Bharat K. Jasthi1; 1South Dakota School of Mines & Technology
    Iron is commonly used in a wide range of applications, such as structures, automobiles, pipelines, and machinery components. However, mild steel is prone to aqueous corrosion when exposed to humidity and often requires a corrosion-resistant coating. Recently, hexagonal boron nitride (hBN) coatings grabbed significant interest because of their excellent anti-corrosion properties. This research aimed to examine the effect of a thickness (25nm, 50nm, and 100nm) of pulsed laser-deposited hBN coatings on the corrosion rate of iron. Microstructural characterization and phase identification of coatings was performed using scanning electron microscopy and RAMAN spectroscopy. Confocal laser scanning microscopy was used to characterize the surface roughness of the coatings, and preliminary results showed that surface roughness increased with an increase in the coating thickness. The electrochemical impedance spectroscopy and Tafel plots were used to evaluate the corrosion properties of hBN-coated iron substrates and were compared with bare substrates with no hBN coatings.

2:40 PM  
Effects of Aging and Surface Mechanical Attrition Treatment on Corrosion Behavior of Aluminum 7075 Alloys: Antriksh Sharma1; Vikrant Beura1; Kiran Solanki1; 1Arizona State University
    In this work, a combination of aging and surface mechanical attrition treatments (SMAT) on aluminum 7075 alloys were performed to investigate microstructural variation in corrosion behavior. The microstructural variations were characterized through X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. An absence of conventionally Mg2Si and Al7Cu2Fe/Al23Fe4Cu phases as well as an abundance of Cu-Zn-Si phases was been observed near the SMAT surface. Aging followed by SMAT processing showed a positive shift in the corrosion potential compared to SMAT-treated alloy; however, anodic and cathodic reaction rates did not show significant variation. Similarly, the electrochemical impedance spectroscopy (EIS) demonstrated a stable and coherent oxide layer after processing the alloy however a reduction in the oxide impedance was observed after the SMATed alloy was aged. Further characterization was done using spectroscopy techniques such as X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma-mass-spectrometry (ICP-MS) to elucidate the underlying corrosion mechanism.

3:00 PM  
Single Step Sputtered Chromium Nitride Nano-clusters Coating for Enhanced Mechanical, Wetting and Corrosion Protection Properties: Ankit Kumar1; Rahul Mulik1; 1IIT Roorkee
    Chromium Nitride (CrN) coating on the market today is known as very hard ceramic coating, most commonly developed on metallic alloys surfaces such as aluminum alloy (Al-7079). In this work, a hydrophobic Chromium nitride (CrN) nano-clusters surface was successfully developed via an industrial used PVD technique. The hardness, corrosion properties and wettability of CrN surface were examined using nanoindentation, electrochemical and contact angle measurements. The obtained results reveal the formation of hierarchal surface of the coating with a low surface energy on the Al-7079 surface, which confers eminent hydrophobicity with a water contact angle (WCA) of 121.8° and an anisotropy of approximately ±2°. Maximum wear resistance (H/Er ~ 0.066) and maximum resistance to fatigue fracture (H3/Er2 ~ 0.070 GPa) have been obtained. Potentiodynamic polarization curve and EIS tests revealed that the eminent hydrophobic surface significantly enhanced the anti-corrosion characteristics of Al-7079 specimen in 3.5 wt % NaCl solution.

3:20 PM Break

3:35 PM  
Electrochemical Properties of Electrodeposited Porous AuCu Dendrite for the Oxygen Reduction Reaction in Alkaline Solutions: Kyu Hwan Lee1; Min-Yeong Kim1; Sung Mook Choi1; 1Korea Institute of Materials Science
     Porous dendrite structured AuCu alloy was formed using a hydrogen bubble template technique by electrodeposition to improve the catalytic performance of gold for oxygen reduction reaction in alkaline medium. The Au-rich surface was maximized by selectively electrochemical etching Cu on the AuCu dendrite surface well formed in a leaf shape.The catalytic activity is mainly due to the synergistic effect of Au and Cu existing on the surface and inside of the particle. Au helps desorption of OH- and Cu contributes to the activation of O2 molecule. The porous structure of AuCu dendrite formed by the hydrogen bubble template was able to control the size of the pores according to the formation time and applied current.The results of this study suggest that the alloying of porous AuCu dendrites and selective Cu dissolution treatment induces an internal alloying effect and a large specific surface area to improve catalyst performance.

3:55 PM  
Bio-inspired Materials as Protective Coatings for Corrosion Prevention: Pawan Sigdel1; Venkata A.S. Kandadai1; Jawaharraj Kalimuthu1; Bharat Jasthi1; Venkataramana Gadhamshetty1; 1South Dakota School of Mines and Technology
    Microbiologically influenced corrosion (MIC) compromises the integrity of many technologically relevant metals. The current use of synthetic material as protective coatings pose potential environmental impacts. Here, we report a MIC-resistant coating based on the biofilm matrix of Citrobacter freundii strain MIC21 on underlying copper (Cu) surfaces. A co-culture of Desulfovibrio alaskensis strain G20 and Citrobacter freundii strain MIC21 served as inocula and lactate-C media as electrolytes. Pure culture of C. freundii and D. alaskensis were used as control. The corrosion tests were carried out with Cu as working, graphite plate as counter, and Ag/AgCl as reference electrodes. Passivating effect of the biofilm matrix was observed in the form of an ennoblement effect. A compact biofilm matrix dominated by strain MIC21 based on sequencing, microscopy, and spectroscopy provided evidence for the passivation effect. This study entails a potential application of C. freundii strain MIC21 biofilm on metals for MIC mitigation.