摘要
针对海水环境加速腐蚀试验无标准方法可循,现有加速腐蚀试验方法效果不理想的问题,以前期研究为基础,通过增大H2O2溶度和添加稳定剂,对AH36船用钢开展了海水加速腐蚀试验研究,并从腐蚀相关性和加速性上与西沙自然环境腐蚀试验结果进行了对比分析。结果表明,采用0.6 mol/LNaCl+1.8 mol/L H_(2)O_(2)+0.2 mol/L H_(3)PO_(4)-NaH_(2)PO_(4)缓冲溶液(pH=2.5)为溶液的加速腐蚀试验与西沙自然环境试验具有较好的相关性和加速性。AH36钢发生不均匀的全面腐蚀,并表现出腐蚀速率先增大后减小的电化学和动力学规律。腐蚀产物由Fe的氧化物和羟基氧化物组成,对中长期腐蚀具有较好的抑制作用。Fe_(3)(PO_(4))_(2)(OH)_(2)难溶盐的生成,增强了锈层的保护性。H_(2)O_(2)通过缩短反应历程和增加溶液溶氧量,促进阴极去极化,加速钢的腐蚀。相对于西沙自然环境试验1a的暴露试验,加速倍率达到约40倍。本研究为海洋材料海水腐蚀的快速评价探索了途径。
In view of the fact that there is no common recognized standard in accelerated corrosion test for the simulation of marine environmental corrosion,and the existing accelerated corrosion test method is not well satisfactory.Therefore,on the basis of our previous research,a solution with addition of higher amount of H2O2,while phosphate buffer solution as stabilizer was proposed for the accelerated corrosion test of AH36 ship hull steel.The testing results were compared with those of the natural environment exposure test at Xisha sea area of Hainan province.It follows that there is a good correlation between the accelerated corrosion test in the solution containing 0.6 mol/L NaCl,1.8 mol/L H_(2)O_(2) and 0.2 mol/L H_(3)PO_(4)-NaH_(2)PO_(4) buffer solution(pH=2.5)and the natural environment exposure test in Xisha sea area;Non-uniform overall corrosion occurs on AH36 steel,The corrosion rate of AH36 steel increases first and then decreases.The corrosion products are composed of iron oxides and hydroxyl oxides,which have a good inhibition effect on medium-and long-term corrosion.The formation of insoluble salt Fe_(3)(PO_(4))_(2)(OH)_(2) enhances the protectiveness of the rust scale.H2O2 promotes cathodic depolarization and accelerates the corrosion of steel by shortening the reaction process and increasing the dissolved oxygen in the solution.Compared with the natural environment exposure test in Xisha for 1 a,the accelerated corrosion test results in an accelerated corrosion rate about 40 times of natural marine environment exposured ones.This study explores a way for rapid evaluation of marine environmental corrosion of engineering steels.
作者
白雪寒
丁康康
张彭辉
范林
张慧霞
刘少通
BAI Xuehan;DING Kangkang;ZHANG Penghui;FAN Lin;ZHANG Huixia;LIU Shaotong(State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Qingdao 266237,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2024年第1期187-196,共10页
Journal of Chinese Society For Corrosion and Protection
基金
科技部科技基础资源调查专项(2019FY101402)
国家自然科学基金(51931008)。
关键词
AH36船用钢
海水环境
加速腐蚀试验
腐蚀产物
电化学行为
AH36 ship hull steel
marine environment
accelerated corrosion test
corrosion product
electrochemical behavior
