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Comparative performances of ni - sic composite coatings deposited by conventional and brush electroplating

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In this paper, Ni - SiC composite coatings were deposited by conventional electroplating from sulfate-chloride bath, and brush electroplating methods from modified chloride bath with different dispersed SiC contents. The plating conditions were investigated and the process’ parameters were defined through electrochemical technique. | TRƯỜNG ĐẠI HỌC SƯ PHẠM TP HỒ CHÍ MINH TẠP CHÍ KHOA HỌC HO CHI MINH CITY UNIVERSITY OF EDUCATION JOURNAL OF SCIENCE KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ NATURAL SCIENCES AND TECHNOLOGY ISSN: 1859-3100 Tập 14, Số 9 (2017): 105-113 Vol. 14, No. 9 (2017): 105-113 Email: tapchikhoahoc@hcmue.edu.vn; Website: http://tckh.hcmue.edu.vn COMPARATIVE PERFORMANCES OF NI-SIC COMPOSITE COATINGS DEPOSITED BY CONVENTIONAL AND BRUSH ELECTROPLATING Bui Thi Thao Nguyen*, Nguyen Thanh Loc Faculty of Materials Technology - University of Technology Received: 06/8/2017; Revised: 19/8/2017; Accepted: 23/9/2017 ABSTRACT SiC particles are known as reinforced materials used to improve the coating’s properties and performances. In this paper, Ni - SiC composite coatings were deposited by conventional electroplating from sulfate-chloride bath, and brush electroplating methods from modified chloride bath with different dispersed SiC contents. The plating conditions were investigated and the process’ parameters were defined through electrochemical technique. Scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and micro-hardness test were used to clarify the effect of SiC content on coating’s properties and performances. The hardness of brush electrodeposit reached the highest value of 525 HV when the concentration of SiC in the plating solution was 4 g/L, while the hardness of conventional electrodeposit was only 389.3 HV when the plating bath contained 20 g/L SiC. The characterized results show clear advantages of brush electroplating compared to the conventional method to form the coating with high micro-hardness. Keywords: brush electroplating, sulfate-chloride bath, Ni - SiC composite coating, inert particle. TÓM TẮT So sánh tính chất của màng composite Ni-Sic được mạ bằng phương pháp mạ bể dung dịch và phương pháp mạ xoa Hạt SiC được xem là vật liệu gia cường nhằm cải thiện tính chất và ngoại quan của các lớp màng composite. Vì vậy, trong bài báo này, lớp màng composite