目的 研究高压直流换流阀散热器的腐蚀机理及其防控技术。方法 通过搭建散热器水冷系统运行平台，搭载化学镀镍和未镀镍两种不同的水冷散热器，研究水冷内流道的腐蚀情况及其影响。通过SEM及元素分析仪分析腐蚀情况及腐蚀产物的组成，并通过万能试验机对金属材质的力学性能进行研究，推导腐蚀机理。另外，对比镀镍和未镀镍水冷器换热效率的变化规律。结果 成功搭建能评估水冷散热器腐蚀性能的试验平台，且在试验平台模拟下，镀镍的水冷散热器在水冷设备上运行3个月后表面光亮，无明显腐蚀物和腐蚀痕迹；而未镀镍的水冷散热器宏观微观上都有较明显的腐蚀产物，主要为含羟基铝石、硫酸铝以及氯化铝等物质，且化学镀镍阴极保护处理后，可使流体在对流换热时的导热热阻减小，让流体在流道里面的流动变成剧烈无序的湍流状态。结论 采用化学镀镍的冷却系统的耐腐蚀性能更为优异，且同时可降低水冷散热器的热阻，从而强化换热效果，改善了水冷散热器的换热性能。

The aims to study the corrosion mechanism and prevention and control technology of high-voltage DC converter valve radiator. By constructing a radiator water-cooling system operation platform, two different water-cooled radiators, electroless nickel plating and non-nickel plating, were used to study the corrosion and influence of the water-cooled inner flow passage. The corrosion condition and the composition of the corrosion products were analyzed by SEM and elemental analyzer, and the mechanical properties of the metal materials were studied by a universal testing machine to derive the corrosion mechanism. The change law of heat exchange efficiency between nickel-plated and unnicked water coolers is also compared. A test platform capable of evaluating the corrosion performance of the water-cooled radiator was successfully built. Under the simulation of the test platform, the nickel-plated water-cooled radiator was bright after 3 months of running on the water-cooled equipment, and there was no obvious corrosion and corrosion marks; Nickel water-cooled heat sinks have obvious corrosion products on the macroscopic and microscopic scales, mainly composed of hydroxyaluminum, aluminum sulfate and aluminum chloride. Moreover, the electroless nickel plating cathodic protection treatment can reduce the thermal conductivity of the fluid during convective heat transfer, and the flow of the fluid in the flow channel becomes a violent disordered turbulent state. The electroless nickel plating cooling system has better corrosion resistance and can reduce the thermal resistance of the water-cooled radiator, thus enhancing the heat exchange effect and improving the heat transfer performance of the water-cooled radiator. It provides a direction for HVDC project application, radiator corrosion and heat transfer efficiency.