某装置海洋环境下腐蚀失效分析及控制措施研究

目的 解决采用ZL205A制造的某装置在海洋环境下的腐蚀失效问题.方法 分析装置所处的海洋浪花飞溅区的使用环境,对腐蚀原因与机理进行深入查找、研究.针对腐蚀原因,制定针对性的腐蚀控制措施,并通过试验予以验证.结果 装置腐蚀失效的主要原因为在海洋高盐、高湿的使用环境下,防腐蚀设计不足,防腐措施不到位,产生了电偶腐蚀、缝隙腐蚀、点蚀、晶间腐蚀、应力腐蚀等.制定的腐蚀控制措施主要有更换耐腐蚀性能较好的ZL114A材料、采用异种金属隔离、完善结构设计与加强过程控制、加强表面涂覆和维护保养等4方面.验证试验表明,采用综合防护措施的ZL114A试样腐蚀轻微,防腐效果良好,而采用原技术状态的ZL205A试样,腐蚀严重,防腐效果差.结论 采取综合防护措施的ZL114A装置在海洋环境下的耐腐蚀性显著提高,实际使用效果良好.

Corrosion Failure Analysis and Research on Control Measures of A Device in Marine Environment

The purpose of this paper is to solve the corrosion failure problem of a device manufactured by ZL205A in marine environment. This paper analyzes the use environment of the ocean wave splash zone where the device is located, and conducts an in-depth search and research on the cause and mechanism of corrosion. Aiming at the cause of corrosion, targeted corrosion control measures have been formulated and verified by tests. The main reasons for the corrosion failure of the device are the insufficient anti-corrosion design and inadequate anti-corrosion measures in the marine environment with high salt and high humidity, resulting in galvanic corrosion, crevice corrosion, pitting corrosion, intergranular corrosion, stress corrosion, etc. The corrosion control measures formulated mainly include replacement of ZL114A material with better corrosion resistance, use of dissimilar metal isolation, improvement of structural design and strengthening of process control, strengthening of surface coating and maintenance. The verification test shows that the ZL114A sample with comprehensive protection measures has slight corrosion and good anti-corrosion effect, while the ZL205A sample with the original technical state has serious corrosion and poor anti-corrosion effect. The ZL114A device with comprehensive protection measures has significantly improved corrosion resistance in the marine environment, and the actual use effect is good.