耐蚀钢筋在模拟混凝土孔隙液环境及海砂混凝土中钢筋在模拟海水环境中的钝化及腐蚀行为  

Passivation Behavior of Corrosion Resistant Rebar Steels as Bare Steels in a Simulated Concrete Pore Fluid and as Rebar Steels Embedded in Concrete Made of Cement and Sea-sand in a Simulated Seawater

作　　者：谢文珍 王震宇 韩恩厚 XIE Wenzhen;WANG Zhenyu;HAN En-Hou(School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510000,China;Guangdong Institute of Corrosion Science and Technology Innovation,Guangzhou 510000,China)

机构地区：[1]广州大学化学化工学院,广州510000 [2]广东腐蚀科学与技术创新研究院,广州510000

出　　处：《中国腐蚀与防护学报》2024年第6期1454-1464,共11页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点研发计划(2021YFB3701700)。

摘　　要：利用电化学技术、微观分析技术,研究Cr10Mo1耐蚀钢筋和在不含Cl^(-)模拟混凝土孔隙液以及埋入海砂混凝土中HRB400普通钢筋模拟海水环境中的钝化行为规律和腐蚀机理,并采用电阻探针技术建立钢筋腐蚀快速评价方法。结果表明:耐蚀钢筋在pH 11.5的模拟液中,表现出较好的钝化行为。在模拟海水环境中,耐蚀钢筋的钝化膜电阻阻值比普通钢筋更大、耐蚀钢筋的腐蚀电流密度也比普通钢筋更小,结合EDS测试和XRD测试,结果表明因存在Cr,通过钝化反应生成的Cr_(2)O_(3)使耐蚀钢筋表现出更优异的耐蚀性能。为了快速评价耐蚀钢筋的腐蚀行为,使用了电阻探针法在模拟海水环境中对其腐蚀速率进行计算,计算得出耐蚀钢筋的年腐蚀速率为0.0047 mm/a,并结合失重法测试的结果证实了此方法可以用作快速评价钢筋的腐蚀行为。The passivation behavior of Cr10Mo1corrosion-resistant rebar steel and ordinary HRB400 rebar steel either as bare steels in a Cl^(-)free simulated concrete pore solution,or as rebar steels embedded in a concrete made of cement and reagent sea-sand in an artificial seawater 3.5%NaCl solution were studied by electrochemical technology and microscopic analysis technology,meanwhile the resistance probe technology was used to establish a rapid evaluation method of rebar corrosion.The results show that the corrosion resistant rebar steel exhibits better passivation behavior in the simulated pore solution with pH 11.5.In the second testing circumstance,the passivation film resistance value of the corrosion-resistant rebar steel is larger than that of the ordinary rebar steel,correspondingly,the corrosion current density of corrosion-resistant rebar steel is also smaller than that of the ordinary one.Results of EDS and XRD characterization show that due to the presence of Cr element,Cr_(2)O_(3)generated by passivation reaction makes corrosion-resistant rebar steel exhibit better corrosion resistance.In order to rapidly evaluate the corrosion behavior of corrosion-resistant rebar steel,the resistance probe method was adopted to assess the corrosion rate of corrosion-resistant rebar steel in the second testing circumstance environment of seawater sand concrete.Consequently,the annual corrosion rate of corrosion-resistant bar steel was acquired to be 0.0047 mm/a.While the corrosion rate acquired by mass loss method dose further confirm that this resistance probe method may suitably be used to rapidly evaluate the corrosion behavior of steel bars within concretes.

关 键 词：混凝土孔隙液 海砂混凝土 腐蚀电化学 电阻探针 模拟海水环境 

分 类 号：TG174[金属学及工艺—金属表面处理]