In this experimental investigation, three different combinations of WC/Co–Cr powder have been selected to prepare a hard, wear, and corrosion resistant coating layer on low carbon steel utilizing an economical tungsten inert gas (TIG) arc source. This study evaluates the coating performance of surface prepared with a commercially available WC-10Co-4Cr powder along with two other powder combinations, i.e., WC-40Co-10Cr and WC-30Co-20Cr. The microstructure of WC/Co-Cr coating shows the formation of equiaxed and columnar growth of reinforcement element and at higher current cellular growth of matrix material with base material's Fe. XRD results depict formation of W2C, Co3W3C, Fe3W3C, Co2W4C, Fe7W6, Cr23C6, Co3C phases during coating process. The coating prepared with WC–10Co-4Cr powder shows highest hardness (1480 HV0.1) with 70 A current. However, coatings' hardness is reduced in all combination of WC/Co-Cr powder at higher current of 90 A, 110 A. The WC/Co-Cr coating shows excellent abrasive resistance in all powder combination with minimum scratches and negligible ploughing and delaminated layer. Results show WC/Co-Cr coating exhibits excellent resistance to corrosion in 3.5 wt% electrolyte. However, the surface modified with WC-30Co-20Cr powder combination shows better resistance to corrosion compared to the surface prepared with WC-40Co-10Co and WC-10Co-4Cr powder. Corrosion results display strong passive layer formation in surface treated with WC-30C-20Cr powder as compared to WC–10Co-4Cr, WC–40Co-10Cr powder combination. The coating surface prepared with WC-30Co-20Cr powder shows 14 % enhancement in corrosion potential (Ecor) and almost 86 % reduction in current density (Icor) compared to the surface treated with WC-40Co-10Co and WC-10Co-4Cr powder.

中文翻译：

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使用 TIG 电弧源形成坚硬、耐磨和耐腐蚀表面的 WC/Co-Cr 涂层的性能评价


在这项实验研究中，选择了三种不同的 WC/Co-Cr 粉末组合，以利用经济的钨惰性气体 （TIG） 电弧源在低碳钢上制备坚硬、耐磨和耐腐蚀的涂层。本研究评估了用市售的 WC-10Co-4Cr 粉末以及其他两种粉末组合（即 WC-40Co-10Cr 和 WC-30Co-20Cr）制备的表面的涂层性能。WC/Co-Cr 涂层的微观结构显示增强元素的等轴和柱状生长的形成，以及在较高电流下基体材料与基材 Fe 的细胞生长。XRD 结果描述了涂层过程中 W2C、Co3W3C、Fe3W3C、Co2W4C、Fe7W6、Cr23C6、Co3C 相的形成。用 WC-10Co-4Cr 粉末制备的涂层在 70 A 电流下显示出最高的硬度 （1480 HV0.1）。然而，在 90 A、110 A 的较高电流下，WC/Co-Cr 粉末的所有组合涂层的硬度都会降低。WC/Co-Cr 涂层在所有粉末组合中均表现出优异的耐磨性，划痕最小，犁地和分层层可忽略不计。结果表明，WC/Co-Cr 涂层在 3.5 wt% 电解液中表现出优异的耐腐蚀性。然而，与用 WC-40Co-10Co 和 WC-10Co-4Cr 粉末制备的表面相比，用 WC-30Co-20Cr 粉末组合改性的表面显示出更好的耐腐蚀性。腐蚀结果表明，与 WC-30Co-20Cr、WC-10Co-10Cr 粉末组合相比，用 WC-20C-10Cr 粉末处理的表面会形成强烈的钝化层。与用 WC-40Co-10Co 和 WC-10Co-4Cr 粉末处理的表面相比，用 WC-30Co-20Cr 粉末制备的涂层表面的腐蚀电位 （Ecor） 提高了 14%，电流密度 （Icor） 降低了近 86%。