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Physical, mechanical and corrosion properties of Zn-15Al alloy coating deposited at different voltage using thermal spray process
IOP Conference Series: Materials Science and Engineering Pub Date : 2021-09-01 , DOI: 10.1088/1757-899x/1173/1/012039
L Yu-Song , T A A Bakar , H Ghandvar , N A Fadil , N Suhaili

Steel is the most widely used metal on earth, cheap and found everywhere. It has good properties such as machinability, strength, ductility, and compatibility with other materials. However, it has weakness such as high corrosion rate which need to improve to achieve satisfying properties. The coating is one of the enhanced methods to improve the quality of steel coating methods are dipping and thermal deposition processes. Both processes have their own advantages and disadvantages. However, the thermal deposition method can produce a coating with better characteristics and performance. Zinc and aluminium are common metals to be used in the thermal spray process; however, a few parameters need to be concerned in the thermal spraying process. They include spraying voltage, spraying distance, deposition rate and applied current. The basic concept is that it melts the material and burst it to the substrate with high velocity. The purpose of this research is to evaluate the physical and corrosion properties of thermal sprayed pure zinc, aluminum and Zn-15Al alloy coating on a mild steel plate. The experimental procedures include roughness, thickness, adhesion, SEM with EDX, and EIS tests. The results show that at 30V, the surface roughness becomes lower, zinc’s decreases from 7.30um to 6.55um, Zn-15Al’s is from 8.52um to 7.93um. For aluminium, its surface roughness increases at higher voltage, from 13.10um to 18.25um. For coating thickness, the value of zinc, aluminium and Zn-15Al of 20V and 30V spraying voltage decreased from 629um to 601um, 486um to 452um, 541um to 536um respectively. The reason for sprays the material at higher velocity to the substrate; these findings depicted smooth and dense coating. Based on SEM/EDX analysis on the cross-sectioned samples, there is no gap between the coating and substrate and demonstrates good coating adhesion. The Daimler-Benz adhesion test shows all coating samples demonstrate good adhesion as no failure at the indentation boundary. In the EIS corrosion test, the frequency range 0.1Hz to 100kHz in 3.5wt.% NaCl solution, the highest impedance shown by zinc, aluminium and Zn-15Al at 20V are 21, 2122 and 49ohms; at 30V, they possess 11, 1347 and 20ohms. It illustrates those coatings with lower spraying voltages demonstrate better corrosion resistance due to the higher coating thickness. Hence, the coating which owns the best properties in all aspects is pure aluminum coating.



中文翻译:

热喷涂不同电压下Zn-15Al合金镀层的物理、机械和腐蚀性能

钢铁是地球上使用最广泛的金属,价格便宜,随处可见。它具有良好的可加工性、强度、延展性以及与其他材料的相容性等性能。但是,它具有腐蚀速率高等弱点,需要改进以达到令人满意的性能。涂层是提高钢材质量的增强方法之一,涂层方法是浸渍和热沉积工艺。这两种工艺各有优缺点。然而,热沉积方法可以产生具有更好特性和性能的涂层。锌和铝是热喷涂工艺中常用的金属;但是,在热喷涂过程中需要关注一些参数。它们包括喷涂电压、喷涂距离、沉积速率和施加的电流。基本概念是它熔化材料并以高速将其爆裂到基材上。本研究的目的是评估低碳钢板上热喷涂纯锌、铝和 Zn-15Al 合金涂层的物理和腐蚀性能。实验程序包括粗糙度、厚度、附着力、带有 EDX 的 SEM 和 EIS 测试。结果表明,在30V时,表面粗糙度变低,锌从7.30um下降到6.55um,Zn-15Al从8.52um下降到7.93um。对于铝,它的表面粗糙度在更高的电压下会增加,从 13.10um 到 18.25um。对于涂层厚度,20V和30V喷涂电压的锌、铝和Zn-15Al值分别从629um下降到601um,486um下降到452um,541um下降到536um。以较高速度将材料喷射到基材上的原因;这些发现描述了光滑和致密的涂层。根据横截面样品的 SEM/EDX 分析,涂层和基材之间没有间隙,并显示出良好的涂层附着力。戴姆勒-奔驰附着力测试表明,所有涂层样品均表现出良好的附着力,压痕边界处没有失效。在EIS腐蚀测试中,频率范围为0.1Hz~100kHz,在3.5wt.% NaCl溶液中,锌、铝和Zn-15Al在20V时表现出的最高阻抗分别为21、2122和49ohms;在 30V 时,它们具有 11、1347 和 20 欧姆。它说明那些具有较低喷涂电压的涂层由于较高的涂层厚度而表现出更好的耐腐蚀性。因此,在各方面都具有最佳性能的涂层是纯铝涂层。根据横截面样品的 SEM/EDX 分析,涂层和基材之间没有间隙,并显示出良好的涂层附着力。戴姆勒-奔驰附着力测试表明,所有涂层样品均表现出良好的附着力,压痕边界处没有失效。在EIS腐蚀测试中,频率范围为0.1Hz~100kHz,在3.5wt.% NaCl溶液中,锌、铝和Zn-15Al在20V时表现出的最高阻抗分别为21、2122和49ohms;在 30V 时,它们具有 11、1347 和 20 欧姆。它说明那些具有较低喷涂电压的涂层由于较高的涂层厚度而表现出更好的耐腐蚀性。因此,在各方面都具有最佳性能的涂层是纯铝涂层。根据横截面样品的 SEM/EDX 分析,涂层和基材之间没有间隙,并显示出良好的涂层附着力。戴姆勒-奔驰附着力测试表明,所有涂层样品均表现出良好的附着力,压痕边界处没有失效。在EIS腐蚀测试中,频率范围为0.1Hz~100kHz,在3.5wt.% NaCl溶液中,锌、铝和Zn-15Al在20V时表现出的最高阻抗分别为21、2122和49ohms;在 30V 时,它们具有 11、1347 和 20 欧姆。它说明那些具有较低喷涂电压的涂层由于较高的涂层厚度而表现出更好的耐腐蚀性。因此,在各方面都具有最佳性能的涂层是纯铝涂层。戴姆勒-奔驰附着力测试表明,所有涂层样品均表现出良好的附着力,压痕边界处没有失效。在EIS腐蚀测试中,频率范围为0.1Hz~100kHz,在3.5wt.% NaCl溶液中,锌、铝和Zn-15Al在20V时表现出的最高阻抗分别为21、2122和49ohms;在 30V 时,它们具有 11、1347 和 20 欧姆。它说明那些具有较低喷涂电压的涂层由于较高的涂层厚度而表现出更好的耐腐蚀性。因此,在各方面都具有最佳性能的涂层是纯铝涂层。戴姆勒-奔驰附着力测试表明,所有涂层样品均表现出良好的附着力,压痕边界处没有失效。在EIS腐蚀测试中,频率范围为0.1Hz~100kHz,在3.5wt.% NaCl溶液中,锌、铝和Zn-15Al在20V时表现出的最高阻抗分别为21、2122和49ohms;在 30V 时,它们具有 11、1347 和 20 欧姆。它说明那些具有较低喷涂电压的涂层由于较高的涂层厚度而表现出更好的耐腐蚀性。因此,在各方面都具有最佳性能的涂层是纯铝涂层。它们具有 11、1347 和 20 欧姆。它说明那些具有较低喷涂电压的涂层由于较高的涂层厚度而表现出更好的耐腐蚀性。因此,在各方面都具有最佳性能的涂层是纯铝涂层。它们具有 11、1347 和 20 欧姆。它说明那些具有较低喷涂电压的涂层由于较高的涂层厚度而表现出更好的耐腐蚀性。因此,在各方面都具有最佳性能的涂层是纯铝涂层。

更新日期:2021-09-01
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