The adhesion of coatings on a given substrate has fundamental importance on a coating/substrate system's functionality. The current paper presents the adhesion strength results of FeCr and CoCr-based deposits produced by the electric arc thermal spray process on carbon steel, with an intermediate layer of 95Ni5Al. Three chemical compositions were tested for coating deposition and were characterized using plate and tube specimens made of carbon steel UNS G10200 to result in a screening of performance. Microstructural evaluation by optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD) were performed. Coating strength was measured using the standard pull-off test method. The corrosion resistance was analyzed with salt spray exposure, electrochemical polarization, and impedance spectroscopy (EIS) tests. The adhesion strength of FeCr and CoCr alloy coatings shows an overall average tensile strength of 27.2 MPa. All sealed conditions presented low corrosion and the samples with epoxy sealant exhibited a high resistance against corrosion. The X-ray diffraction results have revealed alpha and gamma FeCr alloys and chromite as deposited phases after the coating process.

中文翻译：

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评估环氧树脂密封胶的附着力以提高热喷涂涂料的耐腐蚀性

涂料在给定基材上的附着力对涂料/基材系统的功能至关重要。本文介绍了通过电弧热喷涂工艺在中间层为95Ni5Al的碳钢上产生的FeCr和CoCr基镀层的附着强度结果。测试了三种化学成分的涂层沉积，并使用由碳素钢UNS G10200制成的板和管样品进行了表征，以进行性能筛选。进行了通过光学显微镜（OM），扫描电子显微镜（SEM）和X射线衍射（XRD）的微观结构评价。使用标准剥离试验方法测量涂层强度。通过盐雾暴露，电化学极化和阻抗谱（EIS）测试分析了耐腐蚀性。FeCr和CoCr合金涂层的粘合强度显示总体平均拉伸强度为27.2 MPa。所有密封条件下的腐蚀均较低，而采用环氧密封胶的样品则具有较高的耐腐蚀性。X射线衍射结果表明，在涂覆过程之后，α和γFeCr合金和亚铬酸盐作为沉积相。