在Q235钢表面原位生长的氧化铁膜对其在含Cl^-溶液中腐蚀行为的影响Ⅰ-原位生长的γ-FeOOH膜的防护性能  

INFLUENCE OF IN-SITU FORMED IRON OXIDE FILM ON Q235 LOW CARBON STEEL ON ITS CORROSION PERFORMANCE IN Cl^-CONTAINING SOLUTIONS Ⅰ-PROTECTIVENESS OF IN-SITU FORMED γ-FeOOH FILM

作　　者：谢颖[1,2,3] 李瑛[2] 孙挺[1] 王福会[2] 

机构地区：[1]东北大学理学院,沈阳110004 [2]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016 [3]沈阳化工学院,沈阳110142

出　　处：《腐蚀科学与防护技术》2009年第2期128-130,共3页Corrosion Science and Protection Technology

基　　金：国家自然科学基金重大项目(50499330)

摘　　要：利用动电位极化曲线和交流阻抗谱等电化学测量技术,研究了Q235钢表面原位生长的γ-FeOOH膜在0.25mol/LNa2SO4+10-4mol/LNaCl、0.25mol/LNa2SO4+10-3mol/LNaCl、0.25mol/LNa2SO4+10-2mol/LNaCl水溶液中的电化学行为及在不同浓度的Cl-水溶液中γ-FeOOH膜对Q235钢的保护作用.结果表明,Cl-含量较低时,γ-FeOOH膜的存在明显地促进了Q235钢的阴极反应,该膜对基材无保护作用;随Cl-浓度的增加,阴极电流密度大幅减小,当Cl-浓度达到10-2mol/L时,γ-FeOOH膜能在一定程度上抑制基材的腐蚀,此时γ-FeOOH膜表现出对基材有保护作用.In this paper, the electrochemical characteristics of an in-situ formed γ-FeOOH film on Q235 steel have been investigated by means of potentiodynamic polarization and EIS measurements in several Cl^- containing solutions such as 0.25 mol/LNa2SO4 ＋ 10^-4 mol/LNaCl,0. 25 mol/LNa2SO4 ＋ 10^-3 mol/ LNaCl,and 0.25 mol/LNa2SO4 ＋ 10^-2 mol/L NaCl. The results indicate that the γ-FeOOH film formed in situ on Q235 provides no protectiveness to the substrate in an solution with lower Cl^- concentration. With increasing of Cl^- concentration, the cathode current density degreased greatly. When the Cl^- concentration reached to 10-2 mol/L,the in-situ formed γ-FeOOH film on Q235 shows an ability suppressing the corrosion of the substrate steel to certain extent.

关 键 词：γ-FeOOH锈膜 CL^-浓度 原位生长 保护性能 

分 类 号：TG172.6[金属学及工艺—金属表面处理]