X70钢在模拟北部湾海水环境中腐蚀行为教学实验设计  

Teaching Experimental Design for Corrosion Behavior of X70 Steel in Simulated Beibu Gulf Seawater Environment

作　　者：李岩 刘芯月 何家明 韦荣杰 LI Yan;LIU Xinyue;HE Jiaming;WEI Rongjie(Guangxi Key Laboratory of Green Chemical Materials and Safety Technology,Beibu Gulf University,Qinzhou 535011,Guangxi,China;Guangxi Key Laboratory of Ocean Engineering Equipment and Technology,Beibu Gulf University,Qinzhou 535011,Guangxi,China)

机构地区：[1]北部湾大学广西绿色化工新材料与安全技术重点实验室,广西钦州535011 [2]北部湾大学广西海洋工程装备与技术重点实验室,广西钦州535011

出　　处：《实验室研究与探索》2025年第1期44-49,共6页Research and Exploration In Laboratory

基　　金：2023年度广西高等教育本科教学改革工程项目(2023JGZ149);广西自然科学基金项目(2022GXNSFBA035571);钦州市科学研究与技术开发计划项目(2023032)。

摘　　要：基于本校“海洋性”与“地方性”办学特色,突出地方高校油气储运工程专业“海洋性”,设计了“多因素耦合极端条件下X70钢在模拟北部湾海水环境中腐蚀行为”教学实验。采用正交浸泡失重法、电化学测试、腐蚀形貌及腐蚀产物物相表征等技术,研究了多因素耦合极端条件下X70钢在北部湾海水模拟液中的电化学腐蚀行为。结果表明,在Cl^(-)质量浓度、流速和pH值3个影响因素中,流速对X70钢在模拟液中腐蚀的影响最显著;在极端条件下,随着浸泡时间的增加,X70钢在模拟液中的自腐蚀电位先正移后负移再正移,自腐蚀电流密度先减小后增大再减小;阳极发生了铁的溶解,阴极发生了吸氧腐蚀,浸泡时间不影响腐蚀产物膜的物相组成。Based on the“maritime”and“local”schooling characteristics of authors’university,to highlight the“maritime”characteristics of the oil and gas storage and transportation engineering major of local universities,we designed a teaching experiment of“Corrosion Behavior of X70 Steel in Simulated Seawater Environment of Beibu Gulf under Extreme Conditions of Multifactor Coupling”.The electrochemical corrosion behavior of X70 steel in seawater simulant of Beibu Gulf under extreme conditions of multifactorial coupling can be investigated by using testing techniques such as orthogonal immersion weight loss method,electrochemical testing,corrosion morphology and physical phase characterization of corrosion products.The results show that,among the three influencing factors of Cl-concentration,flow speed and pH,the flow speed has the most significant effect on the corrosion of X70 steel in the simulated solution.Under the extreme conditions,with the increase of immersion time,the self-corrosion potential of X70 steel in the simulated solution shifts firstly positively,then negatively,and then positively again,and the self-corrosion current density decreases,then increases,and then decreases again.The anode dissolution of iron occurs,and oxygen-absorbing corrosion occurs at the cathode,and the immersion time does not affect the physical composition of the corrosion product film.

关 键 词：X70钢 北部湾海水环境 多因素耦合 电化学腐蚀 教学实验设计 

分 类 号：TG172.5[金属学及工艺—金属表面处理]