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Comparison of a cold‐sprayed and plasma‐sprayed Fe25Cr20Mo1Si amorphous alloy coatings on 40Cr substrates
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-06-29 , DOI: 10.1002/maco.202011558 Qi Cao 1 , Guosheng Huang 2 , Li Ma 2 , Lukuo Xing 2
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-06-29 , DOI: 10.1002/maco.202011558 Qi Cao 1 , Guosheng Huang 2 , Li Ma 2 , Lukuo Xing 2
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The purpose of this paper is to examine whether cold spraying is capable of manufacturing high‐quality ferrous‐based amorphous alloy coatings by comparing the performance of a cold‐sprayed with a plasma‐sprayed Fe25Cr20Mo1Si amorphous coating on a 40Cr substrate. The hardness, microstructure, wear resistance, and corrosion resistance of the two coatings were determined with potentiodynamic polarization curves, neutral salt spray tests, scanning electron microscopy, energy dispersive spectroscopy, and X‐ray diffraction and their performance differences were examined. The results show that the cold‐sprayed Fe25Cr20Mo1Si coating has an amorphous content of 97.63%, which is slightly higher than that for the raw powder (97.24%) and plasma‐sprayed coating (96.55%). The coating hardness ranges from 720 HV to 1,030 HV, which is higher than plasma‐sprayed coating (590–610 HV) and decreases the wear rate to about 2/3. The average porosity is 2.97 ± 0.59%, which is lower than that of the plasma‐sprayed coating (4.95 ± 0.13%). The cold‐sprayed Fe25Cr20Mo1Si coating can pass the 3,000 hr neutral salt spraying test, while the plasma‐sprayed coating fails within 120 hr. The corrosion current in 3.5% NaCl solution reached to its stable value about 1.66 A/cm2, which is about 1/4 of the plasma‐sprayed coating (5.81 A/cm2). Upon analyzing the properties and the anticorrosion performance, it was found that there are no through‐thickness pores in the cold‐sprayed coating that impact its long‐term anticorrosion performance. Cold spraying can be used to fabricate ferrous‐based amorphous coatings instead of traditional thermal spraying technologies to obtain high‐quality ferrous‐based amorphous coatings.
中文翻译：
在40Cr基底上冷喷涂和等离子喷涂的Fe25Cr20Mo1Si非晶态合金涂层的比较
本文的目的是通过比较在40Cr衬底上冷喷涂和等离子喷涂的Fe25Cr20Mo1Si非晶涂层的性能，来检验冷喷涂是否能够制造高质量的铁基非晶合金涂层。通过电位动力学极化曲线，中性盐雾试验，扫描电子显微镜，能量色散光谱和X射线衍射测定了两种涂层的硬度，微观结构，耐磨性和耐腐蚀性，并检查了它们的性能差异。结果表明，冷喷涂的Fe25Cr20Mo1Si涂层的无定形含量为97.63％，略高于原始粉末（97.24％）和等离子喷涂的涂层（96.55％）。涂层硬度范围为720 HV至1,030 HV，它比等离子喷涂涂层（590–610 HV）高，并且将磨损率降低到大约2/3。平均孔隙率为2.97±0.59％，低于等离子喷涂涂层的孔隙率（4.95±0.13％）。冷喷涂的Fe25Cr20Mo1Si涂层可以通过3,000小时的中性盐雾测试，而等离子喷涂的涂层在120小时内失效。在3.5％NaCl溶液中的腐蚀电流达到稳定值约1.66 A / cm2，约为等离子喷涂涂层的1/4（5.81 A / cm 2）。通过分析性能和防腐性能，发现冷喷涂涂层中没有贯穿厚度的气孔，不会影响其长期防腐性能。可以使用冷喷涂来制造铁基非晶涂层，而不是使用传统的热喷涂技术来获得高质量的铁基非晶涂层。
更新日期：2020-06-29
中文翻译：
在40Cr基底上冷喷涂和等离子喷涂的Fe25Cr20Mo1Si非晶态合金涂层的比较
本文的目的是通过比较在40Cr衬底上冷喷涂和等离子喷涂的Fe25Cr20Mo1Si非晶涂层的性能，来检验冷喷涂是否能够制造高质量的铁基非晶合金涂层。通过电位动力学极化曲线，中性盐雾试验，扫描电子显微镜，能量色散光谱和X射线衍射测定了两种涂层的硬度，微观结构，耐磨性和耐腐蚀性，并检查了它们的性能差异。结果表明，冷喷涂的Fe25Cr20Mo1Si涂层的无定形含量为97.63％，略高于原始粉末（97.24％）和等离子喷涂的涂层（96.55％）。涂层硬度范围为720 HV至1,030 HV，它比等离子喷涂涂层（590–610 HV）高，并且将磨损率降低到大约2/3。平均孔隙率为2.97±0.59％，低于等离子喷涂涂层的孔隙率（4.95±0.13％）。冷喷涂的Fe25Cr20Mo1Si涂层可以通过3,000小时的中性盐雾测试，而等离子喷涂的涂层在120小时内失效。在3.5％NaCl溶液中的腐蚀电流达到稳定值约1.66 A / cm2，约为等离子喷涂涂层的1/4（5.81 A / cm 2）。通过分析性能和防腐性能，发现冷喷涂涂层中没有贯穿厚度的气孔，不会影响其长期防腐性能。可以使用冷喷涂来制造铁基非晶涂层，而不是使用传统的热喷涂技术来获得高质量的铁基非晶涂层。
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