通过宏观形貌检查、金相检验、化学成分分析、扫描电镜及能谱分析等手段,分析了钢制扁管散热器的腐蚀漏水原因。结果表明:水中硫离子的存在加速了氧的局部腐蚀,引起散热器点蚀穿孔;严重的沿晶分布游离渗碳体及未熔合焊接缺陷加速了散热器腐蚀漏水的进程;最后提出了改进措施。 Through the macroscopic examination, metallographic examination, chemical composition analysis, scanning electron microscopy and energy spectrum analysis, the causes of corrosion of steel flat tube radiator were analyzed. The results show that the presence of sulfide in the water accelerates the local corrosion of oxygen and causes the pitting perforation of the heat sink. The severe intergranular distribution of free cementite and unmelted welding defects accelerate the process of corrosion and water leakage of the heat sink. Finally, the improvement measures .