模拟混凝土孔隙液中D-葡萄糖酸钠复合缓蚀剂对钢筋的阻锈作用.pdf

物理化学学报( Wuli Huaxue Xuebao
August
Acta Phys.-Chim.Sin.2012,28(8),1923-1928
Article
doi:10.3866/PKU.WHXB201205292
w.whxb pk
模拟混凝土孔隙液中D-葡萄糖酸钠复合蚀剂对钢筋的阻锈作用
杨榕杰郭亚唐方苗王小平杜荣归”林昌健
(厦门大学化学化工学院化学系,固体表面物理化学国家重点实验室,福建厦门361005)
摘要:应用电化学技术,结合扫描电子显微镜(SEM)观测,研究D-葡萄糖酸钠、钼酸钠和硫脲三组分复合缓蚀
剂对模拟混凝土孔隙液中钢筋腐蚀行为的影响及其阻锈作用.结果表明:在含3.5%(WNaI的模拟混凝士孔
隙液中,复合缓蚀剂具有协同效应,对钢筋有良好的阻锈作用.当D-葡萄糖酸钠、钼酸钠和硫脲浓度分别为
750、250和500mg·L时,对钢的缓蚀效率可达到94.5%.应用软硬酸碱(HSAB)理论分析缓蚀机理,可认为
三组分复合缓蚀剂在钢筋表面共同形成保护膜而阻止钢筋的腐蚀.
关键词:钢筋;模拟混凝土孔隙液;复合绶蚀剂;电化学技术;软硬酸碱理论
中图分类号:O646;TG174
Effect of Sodium D-gluconate-based Inhibitor in Preventing Corrosion
of Reinforcing Steel in Simulated Concrete Pore Solutions
YANG Rong-jie GUO Ya TANG Fang-miao WANG Xiao-ping
DU Rong-gui LIN Chang-jian
State Key Laboratory of Physical Chemistry of olid Surfaces, Department ofchemistry College of Chemistry and Chemical
Engineering, Xiamen University, Xiamen 361005, Fujian Province, P R. China
Abstract: The corrosion behavior of reinforcing steel in simulated concrete pore solutions with and
without corrosion inhibitors was studied by electrochemical techniques and scanning electron microscopy
SEM).A combined inhibitive effect of sodium D-gluconate Na Moo and thiourea on restraining the
corrosion of reinforcing steel immersed in the solution was observed. This result showed that there was a
synergetic effect among the three agents in corrosion prevention After adding the compound inhibitor (750
mg L"sodium D-gluconate, 250 mg L Na Moo,,500 mg thiourea)into the simulated concrete pore
solution containing 3. 5%(w Nacl, the inhi bition efficiency of the compound inhibitor was 94.5%. According
to the Hard and soft acids and bases ( HSAB )theory, the compound inhibitor worked by forming a
protective film on the steel surface
Key Words: Reinforcing steel; Simulated concrete pore solution; Compound corrosion inhibitor
Electrochemical technique, Hard and soft acids and bases theory
1引言
有多种措施可用于保护混凝土中的钢筋,°仞
混凝士在正常情况下呈高碱性环境,可使混凝如,提高混凝土质量,采用耐蚀钢筋或涂层钢筋,使
土中钢筋表面生成致密钝化膜而不发生腐蚀.若混用缓蚀剂,应用阴极保护技术等.其中,添加缓蚀剂
凝土中存在大量氯离子或发生碳化,钢筋表面钝化是一种经济而有效的方法,越来越受到重视.使用
膜就可能受到破坏而导致腐蚀的发生.-5
单一缓蚀剂对钢筋获得的阻锈效果往往不够理想
Received: April 28, 2012; Revised: May 29, 2012, Published on Web: May 29, 2012.
Correspondingauthor.Email:rgdu(@xmu.edu.cn;Tel:+86-592-2189192
The project was supported by the National Natural Science Foundation of China(21073151, 21173177, 50731004, 21021002
国家自然科学基金(21073151,2117317050731004,21021002)资助项目
C Editorial office of Acta Physico-chimica Sinica