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Evaluation of Corrosion Resistance of as-Sprayed WC–Co–Cr on DH-36 Steel with Addition of 3% GNPs

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Abstract

DH 36 is a naval grade steel that is widely used in shipbuilding components and offshore due to its high strength, durability, and usability. However, it suffers from corrosion and slit erosion in acidic and service environments such as sea applications. To address the above concern, a tungsten carbide coating with and without the addition of 3% grapheme nano-platelets is applied to DH 36 steel using the high-velocity oxy-fuel deposition technique. After a coating has been applied, its corrosion resistance was tested by exposing it to a 3.5% Nacl environment for 56 h at environmental temperature of 35 °C and salt mist temperature of 47 °C, as per ASTM B-117, to ensure its integrity. Scanning electron microscopy is used to investigate coating morphologies. After 8 h of corrosion study, it was determined that the coated substrates had no corrosion sign while the DH-36 steel substrate had noticeable pits. The corrosion products were analyzed using the XRD pattern and it was observed that various oxides like WO4, WO3, CoO, W18O49, and FE3O4 were formed after corrosion. This reported coating promises to outperform the pristine substrate in terms of corrosion resistance.

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Authors and Affiliations

  1. Department of Industrial and Production Engineering, Dr B R Ambedkar National Institute of Technology, Jalandhar, Punjab, 144027, India

    Shreyansh Shrivastava, Rajeev Verma, Vijay Kumar & Rahul Soni

  2. Department of Mechanical Engineering, UIET, Panjab University SSG Regional Centre, Hoshiarpur, Punjab, 146023, India

    Gaurav Saini

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  1. Shreyansh Shrivastava
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  2. Rajeev Verma
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Correspondence to Rajeev Verma.

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Shrivastava, S., Verma, R., Kumar, V. et al. Evaluation of Corrosion Resistance of as-Sprayed WC–Co–Cr on DH-36 Steel with Addition of 3% GNPs. Trans Indian Inst Met 77, 1413–1421 (2024). https://doi.org/10.1007/s12666-023-03045-6

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