针对安全级数字化控制系统（DCS）机柜常采用的钢材料在恶劣大气环境中易发生腐蚀的现象，对设备设计时应关注的防腐蚀关键技术展开研究.首先分析了以碳钢为主材料的机柜防腐蚀涂料体系设计流程，列举了在C4等级腐蚀环境和长耐久性要求下常用的涂料及其特性，以及常见的涂料体系.并针对机柜设计中易出现腐蚀的凹槽等特定结构，以及为满足电连续等设计要求而无法采取涂覆保护的特殊位置，概述了在机柜结构设计、工艺和材料方面避免电偶腐蚀、缝隙腐蚀和应力腐蚀等常见问题时需要注意事项.总结涂料体系和结构设计等防腐蚀关键环节的设计原则，为DCS机柜防腐蚀设计提供了参考.
In order to control the corrosion occurred in steel materials which are often used in the safety-related DCS cabinets operating in the severe atmospheric corrosion environment, the key technologies of corrosion protection design to meet the life requirement are explored in this paper. Firstly, the design progress of anti-corrosive coating system for cabinet with steel structure as main material is analyzed. The coatings with their characteristics and the coating systems, which are often used under the corrosivity category C4 and high durability, are listed. Besides, the attention of avoiding common problems such as galvanic corrosion, crevice corrosion and stress corrosion during structure design, process and material selection is summarized, aiming at the specific structure prone to corrosion and the position where coating protection cannot be taken according to design requirement. Through the summary of key anti-corrosion design principles such as coating system and design consideration, the reference for the anti-corrosion design of DCS cabinet is provided.
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