Influence of Cr Content on the Microstructure and Electrochemical Corrosion in Plasma Cladding Ni-Cr Coatings
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INTRODUCTION
DUE to increased development of the marine industry in recent years, the exploitation of marine resources has resulted in rapid development of marine equipment. Carbon steel has been widely used in the manufacture of offshore engineering equipment because of its good machinability, welding performance, high strength, and low cost.[1] Nevertheless, corrosion is the dominant failure mode of carbon steel in the marine environment and poses a great threat to the marine components in terms of safety and economy. The complex and variable environment of the ocean and the salts dissolved in seawater require good corrosion resistance of the carbon steel. In order to improve the corrosion resistance, many surface treatment techniques have been applied, such as electroplating,[2] thermal spraying,[3,4] physical vapor deposition,[5,6] chemical vapor deposition,[7] and laser cladding.[8,9] Kunyarong and Fakpan[10] studied Cr-Ni electro-depositional coatings on T22 steel to explore the influence of the electroplating parameters and annealing on the coating morphology, hardness, chemical
WENYA ZHANG, CANMING WANG, QIANG SONG, HONGZHI CUI, XIAOLI FENG, and CHUNZHI ZHANG are with the College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China. Contact e-mails: [email protected]; [email protected] Manuscript submitted May 16, 2019. Article published online September 13, 2019 5410—VOLUME 50A, NOVEMBER 2019
composition, and corrosion performance. The results showed that the corrosion resistance significantly increased after annealing at 700 C. Wan et al.[11] successfully prepared Ni-based and Fe-based self-fusion alloy composite coatings on the surface of 40Cr steel using laser cladding, and investigated the microstructure, microhardness, tribological properties, and electrochemical corrosion behavior of the coatings. The result showed that the Ni-base coating was superior to the Fe-base coating in terms of wear resistance and corrosion resistance. Liu et al.[12] studied the corrosion behavior of the Ni-based alloys Inconel 625 (In625), Hastelloy X (H X), and Hastelloy B-3 (H B-3) in Cl-containing molten salt using a gravimetric method. The results showed that Ni and Mo in the Ni-based alloys exhibited high stability in the corrosion test because the addition of Cr to the Ni-based alloys improved the corrosion resistance of the alloy. The corrosion rate of the Ni and Mo determined the corrosion rate of the alloy. Feng et al.[13] applied a plasma cladding technique to the in situ synthesis of TiC-TiN-reinforced Fe-base coatings using Ti, B4C, and Fe-based alloy powders as reaction sources. The results showed that the hardness and wear resistance of the coating improved with the increase in the Ti and B4C content and the corrosion resistance was improved over that of the substrate. Among the above-mentioned fabrication techniques, plasma cladding has been widely used in industry because of the outstanding advantages such as excellent arc stability, high en
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