ABSTRACT

Electroplated hard Cr-coated 17-4 PH stainless steel is regularly used in various parts of fuel handling system of nuclear reactors. In this study, the Cr-coated samples were investigated in detail for the coating adhesion using micro-scratch tester and ball indentation. Tribological investigation of the Cr coating was done in a reciprocating ball-on-plate dry sliding geometry against SS 440C ball counterbody. The wear and coefficient of friction (COF) tests were performed under five different loading conditions (3, 5, 7, 9 and 11 N) and three different sliding frequencies (5, 10 and 15 Hz). Wear scars on chromium coating were examined in detail by FESEM and 3D optical profilometer to understand the wear mechanism. It was observed that beyond 7 N critical load, the coating was prone to wear out drastically. Corrosion rate of the coating was estimated in 3.5 wt% NaCl solution by potentiodynamic experiment.

摘要

电镀硬铬涂层17-4 PH不锈钢经常用于核反应堆燃料处理系统的各个部件。在这项研究中，使用微划痕测试仪和球压痕仪详细研究了镀铬样品的涂层附着力。Cr 涂层的摩擦学研究是在 SS 440C 球相对体上往复球板干滑动几何结构中进行的。磨损和摩擦系数 (COF) 测试在五种不同的负载条件（3、5、7、9 和 11 N）和三种不同的滑动频率（5、10 和 15 Hz）下进行。通过 FESEM 和 3D 光学轮廓仪详细检查铬涂层上的磨损痕迹，以了解磨损机制。据观察，超过 7 N 临界载荷时，涂层容易急剧磨损。