热带海洋环境全浸区E690钢的局部腐蚀行为  

Local corrosion behavior of E690 steel in full immersion zone in tropical Marine environment

作　　者：胡杰珍[1] 林国栋 邓培昌[1] 吴敬权[1] 黄欢 HU Jiezhen;LIN Guodong;DENG Peichang;WU Jingquan;HUANG Huan(Key Laboratory of Corrosion and Protection of Ocean Engineering Equipment,Guangdong Ocean University,Zhanjiang 524088,Guangdong,China)

机构地区：[1]广东海洋大学湛江市海洋工程及装备腐蚀与防护重点实验室,广东湛江524088

出　　处：《钢铁》2024年第8期151-157,共7页Iron and Steel

基　　金：广东省自然科学基金资助项目(2021A1515012129)。

摘　　要：随着海洋资源的不断开发和利用,高强钢的需求量不断提高。海洋平台的悬臂梁、桩腿和升降电动齿轮等都需要高强钢强度达到690 MPa以上,并且耐腐蚀性能要较好,E690钢是目前强度较高、综合性能优异的海洋平台用高强钢。随着海洋资源开发深度的不断提高,海洋平台用高强钢所处环境越来越严酷,在海水全浸区长期受到海水侵蚀和生物的污损,还要经受海浪、低温和海流等恶劣海况的破坏,其腐蚀问题越来越突出。基于阵列电极技术在湛江实海环境全浸区进行E690钢腐蚀暴露试验,通过对电连接状态下E690钢腐蚀速率、腐蚀形貌和极化曲线的测试与分析,研究了E690钢在实海环境全浸区电连接状态下的局部腐蚀行为。研究结果表明,在暴露试验初期,随着深度的增加,腐蚀电流密度增加,腐蚀速率提高。处于全浸区上部试样腐蚀速率出现最低值、下部试样腐蚀速率出现峰值,由于温度和溶解氧的影响,在电连接状态下,E690钢形成了宏观腐蚀电池,发生电偶腐蚀,下部试样作为阳极金属腐蚀速率较大,上部试样作为阴极受到保护,腐蚀较轻。随着暴露时间的延长,在试验后期,E690钢的腐蚀电流密度和腐蚀速率明显降低,腐蚀产物和附着生物对基体的保护作用,抑制了E690钢的阳极溶解反应,这是影响金属腐蚀的主要因素,电偶腐蚀影响较小。With the continuous development and utilization of Marine resources,the demand for high-strength steel continues to increase.The cantilever beam,pile leg and lifting electric gear of the offshore platform need the strength of high-strength steel to reach 690 MPa or more,and the corrosion resistance should be better.E690 steel is currently a high strength steel with high comprehensive performance for offshore platforms.With the continuous improvement of the depth of Marine resources development,the environment of high-strength steel used for offshore platform is more and more severe,and it is subjected to seawater erosion and biological fouling in the seawater immersion area for a long time,but also to withstand the damage of waves,low temperature and ocean currents and other harsh sea conditions,the corrosion problem is becoming more and more prominent.Based on the array electrode technology,the corrosion exposure experiment of E690 steel was carried out in the full immersion area of Zhanjiang solid sea environment.The corrosion rate,corrosion morphology and polarization curve of E690 steel were tested and analyzed under the electric connection state.The results show that at the beginning of the exposure experiment,the corrosion current density increases and the corrosion rate increases with the increase of the depth.Due to the influence of temperature and dissolved oxygen,E690 steel formed a macroscopic corrosion battery under electric connection,and galvanic corrosion occurred.The lower sample had a higher corrosion rate as the anode metal,while the upper sample was protected as the cathode,and the corrosion was light.With the extension of exposure time,the corrosion current density and corrosion rate of E690 steel decreased significantly at the later stage of the experiment.The protective effect of corrosion products and attached organisms on the substrate inhibits the anodic dissolution reaction of E690 steel,which is the main factor affecting metal corrosion,while the galvanic corrosion had little effect.

关 键 词：阵列电极技术 E690钢 全浸区 电连接 生物附着 

分 类 号：TG172[金属学及工艺—金属表面处理]