Effects of substrate temperature and deposition time on the morphology and corrosion resistance of FeCoCrNiMo 0.3 high-e
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Effects of substrate temperature and deposition time on the morphology and corrosion resistance of FeCoCrNiMo0.3 high-entropy alloy coating fabricated by magnetron sputtering Chun-duo Dai 1,2), Yu Fu 1,2), Jia-xiang Guo 1,2), and Cui-wei Du 1,2,3) 1) Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China 2) Key Laboratory for Corrosion and Protection, Ministry of Education, Beijing 100083, China 3) Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China (Received: 6 May 2020; revised: 20 July 2020; accepted: 21 July 2020)
Abstract: The effects of substrate temperature and deposition time on the morphology and corrosion resistance of FeCoCrNiMo0.3 coating fabricated by magnetron sputtering were investigated by scanning electron microscopy and electrochemical tests. The FeCoCrNiMo0.3 coating was mainly composed of the face-centered cubic phase. High substrate temperature promoted the densification of the coating, and the pitting resistance and protective ability of the coating in 3.5wt% NaCl solution was thus improved. When the deposition time was prolonged at 500°C, the thickness of the coating remarkably increased. Meanwhile, the pitting resistance improved as the deposition time increased from 1 to 3 h; however, further improvement could not be obtained for the coating sputtered for 5 h. Overall, the pitting resistance of the FeCoCrNiMo0.3 coating sputtered at 500°C for 3 h exceeds those of most of the reported high-entropy alloy coatings. Keywords: high-entropy alloy coating; magnetron sputtering; microstructure; corrosion
1. Introduction Surface coating is an effective method for enhancing the corrosion resistance, wear resistance, and hardness of a metal substrate subjected to a harsh environment [1]. The use of surface coating has been known to improve the durability and service life of structural components. Passive films of about 1–3 nm thickness forming on the surface of alloys for corrosion resistance play a key role in protecting metals from corrosive media [2−4]. Similarly, surface coating technology can be used to protect metal surfaces and is cost-effective. Many types of binary or ternary corrosion-resistant coatings have been developed, and they include metal carbide coatings and metal nitrides or oxide coatings [5−10]. Magnetron sputtering is a widely used deposition technique for fabrication of surface coating [11]. In the past few years, high-entropy alloys (HEAs) with a simple structure and high chemical disorder have attracted much attention due to their surprising and unanticipated combination of properties [12−18]. These HEAs present enormous opportunities and challenges in the design of novel multi
principal coating with outstanding properties [19−21]. HEA coating come in the form of wear-resistant coatings, e.g., Ni0.2Co0.6Fe0.2CrSi0.2AlTi0.2 [22] and FeNiCoAlCu [23]; oxidation-
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