摘要
为准确了解塔筒材料在酸性大气环境下的腐蚀规律并为海上风电塔筒结构防腐优化提供理论依据,利用干湿酸性盐雾试验模拟沿海大气环境,对Q345D合金钢腐蚀24,48,72,96,168,240,360,480 h,研究塔筒材料Q345D钢在该环境下的腐蚀规律。利用X射线衍射仪分析(XRD)、扫描电镜观察(SEM)、通过测定腐蚀失重率、电化学测试等方法对不同腐蚀时间后的Q345D试样进行分析。结果表明:Q345D的腐蚀动力学曲线遵循幂函数规律,随着腐蚀时间的增加,Q345D钢的腐蚀速率呈增长性变化趋势,腐蚀前168 h内,腐蚀速率较快,168~240 h时,腐蚀速率减缓,腐蚀320 h后,速率又开始缓慢增加;Q345D在沿海大气环境下的腐蚀产物主要有β-FeOOH、Fe_(2)O_(3)、γ-FeOOH、Fe_(3)O_(4)、ɑ-FeOOH组成,腐蚀过程中少量ɑ-FeOOH形成减缓了基体的腐蚀速率:带锈Q345D钢自腐蚀电位随腐蚀时间的延长呈现逐渐增加趋势,腐蚀前168 h内,自腐蚀电流密度逐渐增加,腐蚀速率增加,168~240 h内,自腐蚀电流密度减小,锈层保护性逐渐变好,此阶段内腐蚀速率降低,240~480 h内,自腐蚀电流密度增加,腐蚀速率加快。
In order to accurately understand the corrosion laws of tower tube materials in acidic atmosphere environment,and provide a theoretical basis for the anticorrosion optimization of offshore wind turbine tower tube structure,the dry and wet acid salt spray test was used to simulate the coastal atmospheric environment to corrode Q345D alloy steel for 24,48,72,96,168,240,360,480 h to study the corrosion laws of the tower tube material Q345D steel in this environment.The sample Q345D after each corrosion period was analyzed by X-ray diffractometer analysis(XRD),scanning electron microscope(SEM)observation,corrosion weight loss rate,electrochemical measurement and other methods.Results showed that the corrosion kinetics curve of Q345D followed the law of power function.With the increase of corrosion time,the corrosion rate of Q345D steel presented a trend of increasing change.The corrosion rate was fast within 168 h,and then slowed down from 168 h to 240 h,and slowly increased again after 320 h.Under the environment of coastal atmosphere,the corrosion products of Q345D mainly included β-Fe OOH,Fe_(2)O_(3),γ-FeOOH,Fe_(3)O_(4) and α-FeOOH.During the corrosion process,the formation of a small amount ofα-Fe OOH slowed down the corrosion rate of the substrate.The self corrosion potential of rusty Q345D steel showed a trend of gradual increase with the extension of corrosion time.Within 168 h,the self corrosion current density was increased and the corrosion rate was increased;from 168 h to 240 h the self corrosion current density was decreased,the rust layer protection became better gradually,and the corrosion rate was reduced in this stage;and from 240 h to 480 h the corrosion current density was increased and the corrosion rate was accelerated again.
作者
徐敬明
胡杰珍
邓培昌
吴敬权
王贵
XU Jing-ming;HU Jie-zhen;DENG Pei-chang;WU Jing-quan;WANG Gui(School of Mechanical and Power Engineering,Guangdong Ocean University,Zhanjiang 524000,China;School of Chemistry and Environment,Guangdong Ocean University,Zhanjiang 524000,China)
出处
《材料保护》
CAS
CSCD
2021年第3期64-69,80,共7页
Materials Protection
基金
广东省海洋装备及制造工程技术研究中心建设(A16287)资助。
