Dependence of Crystallographic Orientation on Pitting Corrosion Behavior of Ni-Fe-Cr Alloy 028
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Dependence of Crystallographic Orientation on Pitting Corrosion Behavior of Ni-Fe-Cr Alloy 028 LINA ZHANG, JERZY A. SZPUNAR, JIANXIN DONG, OLANREWAJU A. OJO, and XU WANG The influence of crystallographic orientation on the pitting corrosion behavior of Ni-Fe-Cr alloy 028 was studied using a combination of X-ray diffraction (XRD), electron backscatter diffraction (EBSD), potentiodynamic polarization technique, and atomic force microscopy (AFM). The results show that there is anisotropy of pitting corrosion that strongly depends on crystallographic orientation of the surface plane. The distribution of pit density in a standard stereographic triangle indicates that the crystallographic planes close to {100} are more prone to pitting corrosion compared to planes {110} and {111}. The surface energy calculation of (001) and (111) shows that the plane with a high atomic packing density has a low surface energy with concomitant strong resistance to pitting corrosion. A correlation function between crystallographic orientation and pitting corrosion susceptibility suggests a method that not only predicts the pitting resistance of known textured materials, but also could help to improve corrosion resistance by controlling material texture. https://doi.org/10.1007/s11663-018-1227-6 The Minerals, Metals & Materials Society and ASM International 2018
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INTRODUCTION
NICKEL-IRON-CHROMIUM (Ni-Fe-Cr) alloys are widely used in various industries and engineering sectors due to a combination of good mechanical properties and high corrosion resistance.[1–3] Ni-Fe-Cr alloy 028 (alloy 028) is a candidate particularly worth mentioning. The alloy 028 contains high amounts of nickel, copper, and molybdenum, which improve its resistance to corrosion attack in reducing mediums, and the high content of chromium makes the alloy more resistant to oxidizing species. Moreover, the alloy 028 is less expensive due to a higher amount of iron compared with other similar corrosion-resistant alloys. Currently, the alloy 028 is manufactured as evaporator tubes applied in phosphoric acid production; production tubing and casing used in deep and sour gas wells; heat exchangers employed in nuclear power plants, seawater-carrying piping; and seawater-cooled heat exchangers.[4–8] A number of investigations concerning corrosion performance in chloride
LINA ZHANG and OLANREWAJU A. OJO are with the Department of Mechanical Engineering E2-327 EITC, University of Manitoba, Winnipeg, MB R3T 5V6, Canada. Contact e-mail: [email protected] JERZY A. SZPUNAR and XU WANG are with the Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada. JIANXIN DONG is with the School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China. Manuscript submitted August 12, 2017.
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ion mediums and under high-temperature environments containing different partial pressures of CO2 and H2S had been reported.[8–10] Generally, alloy 028 tubulars are prod
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