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首页> 外文期刊>Journal of Materials Engineering and Performance >Surface Modification of 304 Stainless Steel by Electro-Spark Deposition
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Surface Modification of 304 Stainless Steel by Electro-Spark Deposition

机译：电火花沉积304不锈钢表面改造

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Electro-spark deposition (ESD) is a pulsed microwelding process that is used to apply surface coatings for the repair of damaged high value and precision products or modify their surfaces for specific properties. The low heat input, minimal heat-affected zone and the ability to form metallurgical bonding of coating to substrate are major advantages of the ESD process. Many applications require the components to have excellent surface performance, such as wear and corrosion resistance. ESD technique provides an approach to modify the component surface without compromising the bulk properties. In this study, surface modifications of 304 stainless steel by ESD were investigated. Titanium carbide (TiC), tungsten carbide (WC) and molybdenum (Mo) were employed as coating materials. Scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDX) analysis were conducted to characterize the microstructure and composition of the coatings. The coatings thicknesses were all around 40?μm. The results showed that TiC and WC coatings showed a dramatic increase in the microhardness, up to 5 times. WC coating improved the wear resistance by more than 5 times, while TiC and Mo coatings also improved it by approximately 2.5 times. Electro-chemical tests were conducted to investigate the corrosion resistance of the coatings. Mo coating exhibited a significant improvement in the corrosion resistance in 5% NaCl solutions, corroding 350 times slower than stainless steel. Synchrotron x-ray diffraction was performed to investigate the microstructure changes of the Mo-coated sample. Heat treatment was also carried out to investigate the corrosion behavior of Mo-coated 304 stainless steel at elevated service temperature in air or argon.
机译：电火花沉积（ESD）是一种脉冲微​​挤压工艺，用于施加表面涂层，用于修复受损的高值和精密产品，或改变它们的表面以进行特定性质。低热量输入，最小的热影响区域和形成涂层冶金键合的能力是ESD工艺的主要优点。许多应用要求组件具有优异的表面性能，例如磨损和耐腐蚀性。 ESD技术提供一种方法来修改组件表面而不影响散装性质。在该研究中，研究了通过ESD的304个不锈钢的表面改性。碳化钛（TIC），碳化钨（WC）和钼（MO）用作涂料。进行扫描电子显微镜（SEM）和能量分散X射线光谱（EDX）分析以表征涂层的微观结构和组成。涂层厚度均为约40Ωμm。结果表明，TIC和WC涂层显示出显微硬度的显着增加，高达5倍。 WC涂层通过5倍提高耐磨性，而TIC和Mo涂层也将其提高约2.5倍。进行电化学试验以研究涂层的耐腐蚀性。 Mo涂层在5％NaCl溶液中耐腐蚀性显着提高，比不锈钢腐蚀350倍。进行同步X射线衍射以研究Mo涂覆样品的微观结构变化。还进行了热处理，以研究空气或氩气在升高的服务温度下Mo涂覆的304不锈钢的腐蚀行为。

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