Effect of Sulfur Acid Corrosion on the Luminescent Intensity of Plasma-Sprayed YAG:Ce Coatings
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Effect of Sulfur Acid Corrosion on the Luminescent Intensity of Plasma-Sprayed YAG:Ce Coatings Weize Wang1 • Peng Zeng1 • Hehui Wang1 • Jingye Yu1 • Liangmin Wu1
Submitted: 6 June 2016 / in revised form: 16 August 2016 / Published online: 5 December 2016 Ó ASM International 2016
Abstract In order to monitor the corrosion condition of components, plasma-sprayed YAG:Ce coating was prepared for the detection, which could develop the application of plasma spraying. The effect of sulfuric acid corrosion on the microstructure, phase composition and luminescence intensity of coatings was studied. The powder was synthesized by the high-temperature solid-state method. Microstructure and phases were characterized through using SEM and XRD, respectively. Effect of immersion time in the acid was studied on the luminescence intensity. It was found that the phase composition of the powder was dominated by YAG (Y3Al5O12). More pores could be observed in coatings with the increase in immersion time. Sprayed coatings mainly included phases of YAG and YAP (YAlO3). The position of the XRD peaks of coatings was changing during the immersion. The luminescence intensity showed the fluctuation tendency with the immersion time, which related to the coating porosity, phase composition and the migration of the diffract peak.
This article is an invited paper selected from presentations at the 2016 International Thermal Spray Conference, held May 10–12, 2016, in Shanghai, P.R. China, and has been expanded from the original presentation. & Weize Wang [email protected] & Hehui Wang [email protected] 1
Key Laboratory of Pressure System and Safety, Ministry of Education, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
Keywords corrosion luminescent intensity plasma spraying YAG:Ce coating
Introduction Corrosion exists in almost all sector of economy, such as petrochemical, marine, transportation and aerospace, resulting in the performance reduction or degradation of materials. Corrosion also causes a lot of economic losses annually. Among them, the condensate system of the refinery tower is one of the most serious corrosion equipments due to the direct effect of various corrosive media. With the sulfur content in crude oil increasing, the corrosion of the equipment is becoming more evident (Ref 1). The safety problems caused by the corrosion are gradually increasing. It is very important to monitor the corrosion condition for the equipment, so as to grasp the changing information in time. The purpose of corrosion detection is to obtain the change in the structure and properties of materials by measuring the corrosion rate or condition. Detection methods include nondestructive testing (Ref 2-4), physical and mechanical method (Ref 5), chemical analysis method (Ref 6) and electrochemical method (Ref 7). Fluorescence method for characterizing material loss is intuitive, which is currently used for measuring the wear (Ref 8), peelingoff (Ref 9) and stress state (Ref 10) of coat
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