Microstructure, microhardness and corrosion resistance of laser cladding Ni–WC coating on AlSi5Cu1Mg alloy

被引：0
|
作者：
ZENG M. [1 ,2 ,3 ]
YAN H. [1 ,2 ]
YU B.-B. [1 ]
HU Z. [1 ]
机构：
[1] School of Mechanical and Electrical Engineering, Nanchang University, Nanchang
[2] Nanchang Key Laboratory of Light Alloy Preparation & Processing, Nanchang
[3] School of New Energy Vehicles, Nanchang Institute of Science & Technology, Nanchang
来源：
Transactions of Nonferrous Metals Society of China (English Edition) | 2021年 / 31卷 / 09期
关键词：
AlSi5Cu1Mg; corrosion resistance; laser cladding; mechanical properties; Ni–WC coating;
D O I：
10.1016/S1003-6326(21)65687-X
中图分类号：
学科分类号：
摘要：
The microstructure, microhardness, and corrosion resistance of laser cladding Ni–WC coating on the surface of AlSi5Cu1Mg alloy were investigated by scanning electron microscopy, X-ray diffraction, microhardness testing, immersion corrosion testing, and electrochemical measurement. The results show that a smooth coating containing NiAl, Ni3Al, M7C3, M23C6 phases (M=Ni, Al, Cr, W, Fe) and WC particles is prepared by laser cladding. Under a laser scanning speed of 120 mm/min, the microhardness of the cladding coating is 9–11 times that of AlSi5Cu1Mg, due to the synergistic effect of excellent metallurgical bond and newly formed carbides. The Ni–WC coating shows higher corrosion potential (−318.09 mV) and lower corrosion current density (12.33 μA/cm2) compared with the matrix. The crack-free, dense cladding coating obviously inhibits the penetration of Cl− and H+, leading to the remarkedly improved corrosion resistance of cladding coating. © 2021 The Nonferrous Metals Society of China
引用
收藏
页码：2716 / 2728
页数：12
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