Evaluation of the Influence of Surface Finishing on the Corrosion Resistance of HVOF Applied Inconel 625 Coatings on Steel

In this work, the corrosion resistance of Inconel 625 coatings applied to AISI 4140 steel plates was evaluated. Coatings were produced by High Velocity Oxygen Fuel (HVOF) by use of two different equipment which use either kerosene (liquid) or propane (gas) as fuel. The resulting coatings were evaluated in two conditions: as-deposited and after a surface finishing process by grinding. Residual stress distributions in the coatings were characterized by X-ray diffraction and their morphology was verified through metallography and roughness measurements. Potentiodynamic polarization corrosion testing complemented their analysis. The results show a strong influence of the surface finishing process on the corrosion performance of the coatings.

本研究针对沉积于AISI 4140钢板的因科内尔625（Inconel 625）涂层的耐腐蚀性能开展了评价。该涂层采用高速氧燃料（High Velocity Oxygen Fuel，HVOF）工艺制备，分别使用以煤油（液态）或丙烷（气态）为燃料的两套不同设备。所制备的涂层分别在两种状态下进行测试：即沉积态以及经磨削表面处理后的状态。采用X射线衍射（X-ray diffraction）表征涂层的残余应力分布，并通过金相显微分析与粗糙度测量验证涂层形貌，辅以动电位极化腐蚀测试完成完整分析。研究结果表明，表面处理工艺对涂层的耐腐蚀性能具有显著影响。