Cavitation erosion (CE) is a common problem troubling many flow-handling equipment such as valves, orifice plate pipes, and propellers. The coating technique is a widely used strategy to resist CE. It is important to understand the CE-corrosion behavior of the coatings in the corrosive solution, especially in the sand-containing saline water. A newly designed MIG welding precipitated hardened martensitic stainless steel (PHMSS) coating was performed, and its silt-CE was investigated in a suspension composed of 3.5 wt.% sodium chloride and 3% silica sand using an ultrasonic vibrator processor. The microstructure of the coating was characterized by optical microscopy and scanning electron microscopy. The effects of the sand particles on the CE-corrosion were analyzed using mass loss measurement, potentiodynamic polarization curve, and surface morphology observation. The results showed that the PHMSS coating was mainly composed of the lath martensitic phase alone. Its mass loss rate was in ascending order in the solution of distilled water alone, sand-containing distilled water, saline water alone, and sand-containing saline water. Sand particles played more roles in the CE in the distilled water than in the saline water. The synergy of CE and corrosion was much less in the sand-free saline than in the sand-containing saline. The maximum component was the erosion enhancement due to the corrosion in the saline without sand particles but was the pure erosion component in the saline with sand particles. The mechanism of the sand particles' effect on the CE was also discussed.

中文翻译：

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砂粒对盐水中MIG焊接不锈钢涂层气蚀腐蚀协同作用的影响

气蚀 (CE) 是困扰许多流体处理设备（例如阀门、孔板管和螺旋桨）的常见问题。涂层技术是一种广泛使用的抗 CE 策略。了解涂层在腐蚀性溶液中的 CE 腐蚀行为非常重要，尤其是在含砂盐水中。进行了新设计的 MIG 焊接沉淀硬化马氏体不锈钢 (PHMSS) 涂层，并使用超声波振动器处理器在由 3.5 wt.% 氯化钠和 3% 硅砂组成的悬浮液中研究了它的粉砂-CE。通过光学显微镜和扫描电子显微镜表征涂层的微观结构。通过质量损失测量、动电位极化曲线、和表面形貌观察。结果表明，PHMSS涂层主要由板条马氏体相组成。其质量损失率在单独蒸馏水、含砂蒸馏水、单独盐水和含砂盐水溶液中依次递减。砂粒在蒸馏水中的 CE 中比在盐水中的作用更大。CE 和腐蚀的协同作用在无砂盐水中比在含砂盐水中小得多。最大的成分是无砂粒盐水中由于腐蚀引起的侵蚀增强，而在有砂粒的盐水中是纯侵蚀成分。还讨论了砂粒对CE影响的机制。结果表明，PHMSS涂层主要由板条马氏体相组成。其质量损失率在单独蒸馏水、含砂蒸馏水、单独盐水和含砂盐水溶液中依次递减。砂粒在蒸馏水中的 CE 中比在盐水中的作用更大。CE 和腐蚀的协同作用在无砂盐水中比在含砂盐水中小得多。最大的成分是无砂粒盐水中由于腐蚀引起的侵蚀增强，而在有砂粒的盐水中是纯侵蚀成分。还讨论了砂粒对CE影响的机制。结果表明，PHMSS涂层主要由板条马氏体相组成。其质量损失率在单独蒸馏水、含砂蒸馏水、单独盐水和含砂盐水溶液中依次递减。砂粒在蒸馏水中的 CE 中比在盐水中的作用更大。CE 和腐蚀的协同作用在无砂盐水中比在含砂盐水中小得多。最大的成分是无砂粒盐水中由于腐蚀引起的侵蚀增强，而在有砂粒的盐水中是纯侵蚀成分。还讨论了砂粒对CE影响的机制。单独的盐水和含沙的盐水。砂粒在蒸馏水中的 CE 中比在盐水中的作用更大。CE 和腐蚀的协同作用在无砂盐水中比在含砂盐水中小得多。最大的成分是无砂粒盐水中由于腐蚀引起的侵蚀增强，而在有砂粒的盐水中是纯侵蚀成分。还讨论了砂粒对CE影响的机制。单独的盐水和含沙的盐水。砂粒在蒸馏水中的 CE 中比在盐水中的作用更大。CE 和腐蚀的协同作用在无砂盐水中比在含砂盐水中小得多。最大的成分是无砂粒盐水中由于腐蚀引起的侵蚀增强，而在有砂粒的盐水中是纯侵蚀成分。还讨论了砂粒对CE影响的机制。最大的成分是无砂粒盐水中由于腐蚀引起的侵蚀增强，而在有砂粒的盐水中是纯侵蚀成分。还讨论了砂粒对CE影响的机制。最大的成分是无砂粒盐水中由于腐蚀引起的侵蚀增强，而在有砂粒的盐水中是纯侵蚀成分。还讨论了砂粒对CE影响的机制。