Corrosion Resistance to Molten Zinc of a Novel Cermet Coating Deposited by Activated Combustion High-Velocity Air Fuel (
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Corrosion Resistance to Molten Zinc of a Novel Cermet Coating Deposited by Activated Combustion High-Velocity Air Fuel (AC-HVAF) Xiaolong Xie1,2 • Fucheng Yin1,2 • Xinming Wang1,2 • Xuemei Ouyang1,2 Minghuan Li1,2 • Jing Hu1,2
•
Submitted: 7 January 2019 / in revised form: 5 July 2019 Ó ASM International 2019
Abstract Molten zinc is very aggressive to austenitic stainless steels. In this study, a novel cermet coating consisting of FeB-12 wt.%Al0.25FeNiCoCr was deposited on the surface of 316L stainless steel to protect it from liquid zinc corrosion using activated combustion high-velocity air fuel (AC-HVAF). The microstructure and phase composition of the powders and coating were determined by scanning electron microscopy (SEM) with energy-dispersive x-ray spectroscopy (EDS) and x-ray diffraction (XRD) analysis. The thermal expansion coefficient, microhardness, thermal shock resistance, abrasive wear resistance, and corrosion resistance to molten zinc of the coating were investigated. The results showed that the first macrocrack appeared on the surface of the coating after 32 thermal shock cycles. Compared with the 316L stainless steel substrate, the abrasive wear resistance of the coating was twice as high. Also, the average corrosion rate of the FeB12 wt.%Al0.25FeNiCoCr coating in molten zinc at 450 °C was 16.17 lm/day, much lower than the value of 115.44 lm/day for 316L stainless steel in molten zinc at 460 °C. Keywords AC-HVAF cermet coating corrosion Fe-B alloy flame spray molten zinc stainless steel
& Fucheng Yin [email protected] 1
School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, People’s Republic of China
2
Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan, Hunan 411105, People’s Republic of China
Introduction In continuous hot-dip galvanizing lines, the parts and components of the galvanizing equipment (e.g., bearings, sinks rolls, stabilizing rolls, etc.) are subjected to corrosion by molten zinc (Ref 1). As a cheap and common material for anticorrosion applications, 316L stainless steel is thus widely used for production of these parts and components (Ref 2). However, 316L stainless steel is not a material specially designed for galvanizing, so its corrosion resistance to molten zinc is debatable (Ref 3). To extend the service life of such components, high-velocity oxygen fuel (Ref 4-7) (HVOF) is widely used to spray cermet coatings such as WC/Co (Ref 8-10) or MoB/CoCr (Ref 11-13) onto the surface of 316L stainless steel. Activated combustion high-velocity air fuel (AC-HVAF), a new kind of thermal spraying technology, has been developed in recent years. Coatings deposited by AC-HVAF (Ref 14-16) are characterized by higher density and lower oxide content compared with those obtained by HVOF. In addition, the substitution of compressed air for pure oxygen reduces the cost of preparation (Ref 17). By spraying WC/Co or MoB/ CoCr coatings onto the surface of 316L stainle
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