海洋腐蚀环境及船用不锈钢管选材备考（下）

摘要

The marine corrosion environment was analyzed from the composition of water and sea water corrosion factors. According to the standard of marine stainless steel pipe,it analyzed and assessed the material selection of stainless steel pipe used for ocean petroleum and petrochemical for different use and environment,and analyzed the application case of stainless steel pipe used for marine at home and abroad,finally,it discussed the development tendency of corrosion resistance alloy. The research results showed that Cl- pitting corrosion and crevice corrosion are the root cause of the marine environment corrosion hazard,304L steel is not with the ocean corrosion resistance performance,316L steel can only be used in water after deoxidization under a certain environment and temperature;Application of stainless steel pipe in natural seawater should adopt cathodic protection measures,it should consider the composition of internal oil and gas medium and corrosion characteristics in materials selecting for all kinds of pipeline in oil recovery platform production operation ship.%从海水的成分和海水腐蚀因素对海洋腐蚀环境进行了分析，根据海洋船舶不锈钢管材的标准，分析并评估了海洋石油石化用不锈钢管在不同用途和环境下的选材思路，列举并分析了国内外海洋用不锈钢管的应用案例，最后对船舶用耐蚀合金的发展趋势进行了讨论。研究结果表明， Cl-孔蚀和缝隙腐蚀是海洋环境腐蚀危害的根本原因，304L钢不具备耐海洋腐蚀的性能，316L钢只能在一定环境和温度下在脱氧后的海水中使用；在自然海水中应用不锈钢管必须采用阴极保护措施；采油平台等油气生产作业船舶中各类管道的选材应先考虑其内部的油气介质成分及其腐蚀特征。