Abstract: To accurately identify differences in corrosion damage across various vehicle regions and achieve precise anti-corrosion design with cost optimization, this study systematically collected panel check index (PCI) data from four typical areas–roof, underbody, engine compartment, and passenger compartment-based on accelerated corrosion tests of passenger vehicles. Combined with the equivalent cumulative corrosion environment method, quantitative analysis and comparison of corrosion damage in each region were conducted. The test results show significant differences in corrosion damage across vehicle regions, with the damage level following the descending order: underbody>roof>engine compartment>passenger compartment. Notably, after 60 test cycles, the corrosion damage in the underbody reached 596.55, approximately 224 times that of the passenger compartment. Based on these findings, the paper further proposes a differentiated anti-corrosion design strategy for different zones, along with recommendations for materials, coatings, and structural improvements for high-risk areas. This research provides data support and methodological references for the reverse optimization of vehicle anti-corrosion design, contributing to the efficient allocation of anti-corrosion resources.

Key words: corrosion damage; zonal protection; PCI; accelerated corrosion test; anti-corrosion design

摘要： 为精准识别整车不同区域的腐蚀损伤差异并实现防腐设计的精准化与成本优化，文章 基于乘用车强化腐蚀试验，系统采集了车顶、车底、机舱与乘员舱四个典型区域的面板检测 指标（PCI）数据，结合腐蚀环境当量累积方法，对各区域腐蚀损伤进行了定量分析与比较。 试验结果表明，整车各区域腐蚀损伤存在显著差异，腐蚀损伤顺序为车底>车顶>机舱>乘员舱， 其中，车底在 60 次循环后腐蚀损伤高达 596.55，约为乘员舱的 224 倍。基于上述结果，文章 进一步提出了分区差异化防腐设计策略，并针对高腐蚀风险区域提出了材料、涂层与结构优 化建议。研究为整车防腐设计的逆向优化提供了数据支撑与方法依据，有助于实现防腐资源的 高效配置。

关键词: 腐蚀损伤；分区防护；PCI；强化腐蚀试验；防腐设计