Nanoscience and Nanometrology

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Effects of Laser Glazed Surface on Pitting Corrosion of Nickel Alloy 718 in Acidic and Seawater Environments

Received: 6 July 2021    Accepted: 28 July 2021    Published: 9 August 2021
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Abstract

Studies on the effects of laser glazed and unglazed sample surfaces on the pitting corrosion resistance of nickel alloy 718 have been carried out. Both sample surfaces of nickel alloy 718 were cut to different dimensions for pitting corrosion tests using potentiostatic polarization process. The alloy samples used for electrochemical testing were connected to a flexible wire joined by spot weld process. The alloy samples were coated with low viscous polymeric wax leaving the surface areas to be tested exposed to seawater and one mole concentration of hydrochloric acid environments. These samples which are working electrodes have electrical connection between reference electrode and counter electrode and the entire system were connected to computer with PSTrace software that stands as potentiostat. Pre and post morphological examination of the sample surfaces were done using confocal laser scanning microscopy and scanning electron microscopy respectively. The results of pitting corrosion tests showed that the glazed and unglazed alloy sample surfaces immersed in seawater environment suffered from pitting corrosion as a result of the presence of pit initiation sites developed during surface laser treatment and also the presence of some aggressive anions like Cl-, SO4- etc in the environment which migrated into the pits due to electrostatic balance and escalated pitting corrosion; while the samples of both surfaces immersed in 1MHCl suffered more from general corrosion. Post pitting corrosion examinations revealed that corrosion oxide films formed on the sample surfaces in acidic and alkaline environments were not protective as they flaked and exposed the sample surfaces to more corrosion attack.

DOI 10.11648/j.nsnm.20210702.11
Published in Nanoscience and Nanometrology (Volume 7, Issue 2, December 2021)
Page(s) 27-31
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Corrosion, Pitting, Potentiostat, Laser, Glazed, Nickel, Environment, Morphological

References
[1] Julien Deleume, Jean-Marc Cloué, Eric Andrieu: Influence of d phase precipitation on the stress corrosion cracking resistance of alloy 718 in PWR primary water. Journal of Nuclear Materials 382 (1) November 2008.
[2] W. L Kimmerl et al: Stress corrosion cracking of alloy 718 in pressurized-water-reactor primary water, 1562 Beeson St., Alliance, OH 44601 EPRI, 3412 Hill view Ave., Palo Alto, CA 94303, 2014.
[3] A. Devaux et al: Gamma double prime precipitation kinetic in Alloy 718, Journal of Materials Science and Engineering A486 (2008) 117–122.
[4] https://www.farinia.com/additive-manufacturing/3d-materials/inconel-718-aerospaceadditive-manufacturing (accessed on 8 April 2020).
[5] Lv, J. H.; Wang, W. Z.; Liu, S. W. Statistical Analysis of Failure Cases in Aerospace. Int. Sch. Sci. Res. Innov. 2018, 12, 497–501.
[6] S. E. Ede, A text book on theory of corrosion & protection 1st edition, Obi press, Enugu Nigeria, 2012, 1, Pp 1-2.
[7] El-Meligi, A.; Palatino, L. I. E_ect of nanostructure on corrosion and corrosion resistance of materials. Curr. Chem. Res. 2012, 2, 47–56.
[8] Ede, S. E, Effects of laser glazed surface on corrosion resistance of nickel alloy 718. A dissertation submitted to the University of Manchester for the award of MSc. in corrosion control Engineering, Faculty of Engineering and physical sciences September 2019.
[9] Akca, E.; Gursel, A. A Review on Super alloys and IN718 Nickel-Based Inconel Super alloy. Period. Eng. Nat. Sci. 2015, 3, 15–27.
[10] Thompson, M. K.; Moroni, G.; Vaneker, T.; Fadel, G.; Campbell, R. I.; Gibson, I.; Bernard, A.; Schulz, J.; Graf, P.; Ahuja, B.; et al. Design for Additive Manufacturing: Trends, opportunities, considerations, and constraints. CIRP Ann. 2016, 65, 737–760.
[11] Gibson, I.; Rosen, D.; Stucker, B. Directed Energy Deposition Processes BT--Additive Manufacturing Technologies: 3D Printing, Rapid Prototyping, and Direct Digital Manufacturing. Johns. Matthey Technol. Rev. 2015, 59, 245–268.
[12] CrtomirDonik and Aleksandra Kocijan: Comparison of the corrosion behaviour of austenitic stainless steel in seawater and in a 3.5%NaCl solution, 48 (6) 937 (2014).
[13] JuriKolts: Alloy 718 for the oil and gas industry; Super alloy 718-metallurgy and applications. The minerals, metals & materials society, Conoco Inc. P. 0. Box 1267 Ponca City, OK 74603, 1989. International NACE annual conference on pitting corrosion 2008.
[14] Yuan Tian et al: International conference and ASM of The Minerals, Metals & Materials Society on rationalization of microstructure heterogeneity in INCONEL 718 builds made by the direct Laser additive manufacturing process 2014.
[15] www.palmsens.com.
[16] Scully J. C, The fundamentals of corrosion, 3rd edition, oxford pergamon press 1990.
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  • APA Style

    Sunday Ejiofor Ede, Thomas Okechukwu Onah. (2021). Effects of Laser Glazed Surface on Pitting Corrosion of Nickel Alloy 718 in Acidic and Seawater Environments. Nanoscience and Nanometrology, 7(2), 27-31. https://doi.org/10.11648/j.nsnm.20210702.11

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    ACS Style

    Sunday Ejiofor Ede; Thomas Okechukwu Onah. Effects of Laser Glazed Surface on Pitting Corrosion of Nickel Alloy 718 in Acidic and Seawater Environments. Nanosci. Nanometrol. 2021, 7(2), 27-31. doi: 10.11648/j.nsnm.20210702.11

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    AMA Style

    Sunday Ejiofor Ede, Thomas Okechukwu Onah. Effects of Laser Glazed Surface on Pitting Corrosion of Nickel Alloy 718 in Acidic and Seawater Environments. Nanosci Nanometrol. 2021;7(2):27-31. doi: 10.11648/j.nsnm.20210702.11

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  • @article{10.11648/j.nsnm.20210702.11,
      author = {Sunday Ejiofor Ede and Thomas Okechukwu Onah},
      title = {Effects of Laser Glazed Surface on Pitting Corrosion of Nickel Alloy 718 in Acidic and Seawater Environments},
      journal = {Nanoscience and Nanometrology},
      volume = {7},
      number = {2},
      pages = {27-31},
      doi = {10.11648/j.nsnm.20210702.11},
      url = {https://doi.org/10.11648/j.nsnm.20210702.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.nsnm.20210702.11},
      abstract = {Studies on the effects of laser glazed and unglazed sample surfaces on the pitting corrosion resistance of nickel alloy 718 have been carried out. Both sample surfaces of nickel alloy 718 were cut to different dimensions for pitting corrosion tests using potentiostatic polarization process. The alloy samples used for electrochemical testing were connected to a flexible wire joined by spot weld process. The alloy samples were coated with low viscous polymeric wax leaving the surface areas to be tested exposed to seawater and one mole concentration of hydrochloric acid environments. These samples which are working electrodes have electrical connection between reference electrode and counter electrode and the entire system were connected to computer with PSTrace software that stands as potentiostat. Pre and post morphological examination of the sample surfaces were done using confocal laser scanning microscopy and scanning electron microscopy respectively. The results of pitting corrosion tests showed that the glazed and unglazed alloy sample surfaces immersed in seawater environment suffered from pitting corrosion as a result of the presence of pit initiation sites developed during surface laser treatment and also the presence of some aggressive anions like Cl-, SO4- etc in the environment which migrated into the pits due to electrostatic balance and escalated pitting corrosion; while the samples of both surfaces immersed in 1MHCl suffered more from general corrosion. Post pitting corrosion examinations revealed that corrosion oxide films formed on the sample surfaces in acidic and alkaline environments were not protective as they flaked and exposed the sample surfaces to more corrosion attack.},
     year = {2021}
    }
    

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  • TY  - JOUR
    T1  - Effects of Laser Glazed Surface on Pitting Corrosion of Nickel Alloy 718 in Acidic and Seawater Environments
    AU  - Sunday Ejiofor Ede
    AU  - Thomas Okechukwu Onah
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    PY  - 2021
    N1  - https://doi.org/10.11648/j.nsnm.20210702.11
    DO  - 10.11648/j.nsnm.20210702.11
    T2  - Nanoscience and Nanometrology
    JF  - Nanoscience and Nanometrology
    JO  - Nanoscience and Nanometrology
    SP  - 27
    EP  - 31
    PB  - Science Publishing Group
    SN  - 2472-3630
    UR  - https://doi.org/10.11648/j.nsnm.20210702.11
    AB  - Studies on the effects of laser glazed and unglazed sample surfaces on the pitting corrosion resistance of nickel alloy 718 have been carried out. Both sample surfaces of nickel alloy 718 were cut to different dimensions for pitting corrosion tests using potentiostatic polarization process. The alloy samples used for electrochemical testing were connected to a flexible wire joined by spot weld process. The alloy samples were coated with low viscous polymeric wax leaving the surface areas to be tested exposed to seawater and one mole concentration of hydrochloric acid environments. These samples which are working electrodes have electrical connection between reference electrode and counter electrode and the entire system were connected to computer with PSTrace software that stands as potentiostat. Pre and post morphological examination of the sample surfaces were done using confocal laser scanning microscopy and scanning electron microscopy respectively. The results of pitting corrosion tests showed that the glazed and unglazed alloy sample surfaces immersed in seawater environment suffered from pitting corrosion as a result of the presence of pit initiation sites developed during surface laser treatment and also the presence of some aggressive anions like Cl-, SO4- etc in the environment which migrated into the pits due to electrostatic balance and escalated pitting corrosion; while the samples of both surfaces immersed in 1MHCl suffered more from general corrosion. Post pitting corrosion examinations revealed that corrosion oxide films formed on the sample surfaces in acidic and alkaline environments were not protective as they flaked and exposed the sample surfaces to more corrosion attack.
    VL  - 7
    IS  - 2
    ER  - 

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Author Information
  • Department of Metallurgical and Materials Engineering, Enugu State University of Science and Technology, Enugu, Nigeria

  • Department of Mechanical and Production Engineering, Enugu State University of Science and Technology, Enugu, Nigeria

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