DOI:10.11973/fsyfh-202212011907A低合金钢在模拟深海环境中的腐蚀行为及机理孙静1,赵雨波1,2,李炳志1,2,张海兵2,侯健2,孟晓1,2,蔺存国2(1.山东科技大学机械电子工程学院,青岛266590;2.中国船舶集团公司第七二五研究所海洋腐蚀与防护重点实验室,青岛266101)摘要:利用自制试验装置,通过静态失重试验、电化学测试,研究了907A低合金钢在模拟1000m深海环境中的腐蚀行为,并对其腐蚀机理进行了分析。结果表明:907A低合金钢在模拟深海环境中的腐蚀速率随浸泡时间的延长而逐渐减小,最终趋于稳定,致密均匀的锈层有效遏制了腐蚀性离子向基体渗透,起到防护作用;腐蚀产物主要以α-FeOOH、γ-FeOOH和Fe3O4为主,随着浸泡时间的延长,γ-FeOOH向α-FeOOH的转化使907A钢的腐蚀速率降低;浸泡初期907A钢表面主要发生点蚀,点蚀萌生于基体与夹杂物界面处,随着浸泡时间的延长,点蚀逐渐转变为均匀腐蚀。关键词:深海;907A低合金钢;点蚀;腐蚀行为中图分类号:TG174文献标志码:A文章编号:1005-748X(2022)12-0068-10CorrosionBehaviorandMechanismof907ALowAlloySteelinSimulatedDeepSeaEnvironmentSUNJing1,ZHAOYubo1,2,LIBingzhi1,2,ZHANGHaibing2,HOUJian2,MENGXiao1,2,LINCunguo2(1.CollegeofMechanicalandElectronicEngineering,ShandongUniversityofScienceandTechnology,Qingdao266590,China;2.StateKeyLaboratoryforMarineCorrosionandProtection,LuoyangShipMaterialResearchInstitute,Qingdao266101,China)Abstract:Thecorrosionbehaviorof907Alowalloysteelinsimulated1000mdeepseaenvironmentwasstudiedbystaticweight-losetestandelectrochemicaltestwithaself-madetestdeviceanditscorrosionmechanismwasanalyzed.Theresultsshowedthatthecorrosionrateof907Alowalloysteelinsimulateddeepseaenvironmentdecreasedgraduallywiththeextensionofimmersiontime,andfinallytendedtobestable.Thedenseanduniformrustlayereffectivelyrestrainedthepenetrationofcorrosiveionsintothematrixandplayedaprotectiverole.Themaincorrosionproductswereα-FeOOH,γ-FeOOHandFe3O4.Whentheimmersiontimewasprolonged,theconversionfromγ-FeOOHtoα-FeOOHreducedthecorrosionrateof907Asteel.Attheinitialstageofimmersion,pittingmainlyoccurredonthesurfaceof907Asteel,whichoriginatedattheinterfacebetweenmatrixandinclusions.Withtheextensionofimmersiontime,pittinggr...
