超高强船体钢EH890在不同pH海洋环境中的耐蚀性研究  

Study on corrosion resistance of ultra high strength hull steel EH890 in marine environment with different pH

作　　者：周生璇 车马俊[1,2] 马新元 杜晓洁 何宜柱[1] ZHOU Shengxuan;CHE Majun;MA Xinyuan;DU Xiaojie;HE Yizhu(School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243002,China;Nanjing Iron&Steel Co.Ltd.,Nanjing 210035,China)

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]南京钢铁股份有限公司,江苏南京210035

出　　处：《现代交通与冶金材料》2022年第1期78-85,共8页Modern Transportation and Metallurgical Materials

基　　金：南京钢铁股份有限公司与安徽工业大学重点合作研发项目(IGAB19050011)。

摘　　要：为研究超高强船体钢EH890在不同酸碱度海洋环境中的耐蚀性,分别在pH3,pH7,pH11的3.5%NaCl溶液中进行了电化学腐蚀实验,用场发射扫描电镜分析了在不同溶液中浸泡24 h后腐蚀形貌,并结合X射线光电子能谱研究了腐蚀产物组成,对比分析了EH890钢在不同pH海洋环境中的腐蚀行为。结果表明,在pH3的3.5%NaCl溶液中,EH890的腐蚀电流密度最大为3.316×10^(-5)A·cm^(-2),腐蚀速率最快。而在pH7和pH11溶液中的腐蚀电流密度降低了98%,腐蚀速率减小,并呈现出与在pH 3溶液不同的腐蚀机理。pH的升高一方面使阴极反应物从主要为氢离子变为氢离子和溶解氧共同反应最终至主要为溶解氧,导致腐蚀电流密度减小,腐蚀速率减慢;另一方面导致电化学反应发生变化,试样表面腐蚀产物由FeCl_(2),FeCl_(3)和Fe_(2)O_(3)向Fe_(3)O_(4),Fe_(2)O_(3)和FeOOH转变,提高了对基体的保护能力。To study the corrosion resistance of ultra-high strength hull steel EH890 in different pH marine environments,electrochemical corrosion experiments were conducted in pH3,pH7,pH113.5%NaCl solutions,and the corrosion morphology was analyzed by field emission scanning electron microscopy after 24 h immersion in different solutions,and the composition of corrosion products was studied in combination with X-ray photoelectron spectroscopy.The corrosion behavior of EH890 steel in different pH marine environment was compared and analyzed.The results showed that the corrosion current density of EH890 in the 3.5%NaCl solution at pH 3 was 3.316×10^(-5) A·cm^(-2),and the corrosion rate was the fastest.While the corrosion current density in pH7 and pH11 solutions decreased by 98%,the corrosion rate decreased and showed a different corrosion mechanism from that in pH3 solution.On the one hand,the increase of pH changes the cathode reactant from mainly hydrogen ion to hydrogen ion and dissolved oxygen,and finally to mainly dissolved oxygen,resulting in the decrease of corrosion current density and the slowdown of corrosion rate.On the other hand,it leads to the change of electrochemical reaction.The corrosion products on the sample surface change from FeCl_(2),FeCl_(3) and Fe_(2)O_(3) to Fe_(3)O_(4),Fe_(2)O_(3) and FeOOH,which improves the protection ability of the substrate.

关 键 词：船体结构钢 PH 海洋环境 耐腐蚀 锈层 

分 类 号：TG172.5[金属学及工艺—金属表面处理] TG142.41[金属学及工艺—金属学]