3.5% NaCl饱和Ca(OH)2溶液中醇胺缩聚物对碳钢腐蚀的抑制  

Corrosion Inhibition by Sorbitol/Diethylenetriamine Condensation Product for Carbon Steel in 3.5% NaCl Saturated Ca(OH)_2 Solution

作　　者：周欣[1,2] 杨怀玉[1] 王福会[1] 

机构地区：[1]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 [2]辽宁科技学院,冶金工程学院,辽宁本溪117022

出　　处：《物理化学学报》2011年第3期647-654,共8页Acta Physico-Chimica Sinica

基　　金：国家科技支撑计划(2007BAB27B03)资助项目~~

摘　　要：利用动电位极化,电化学阻抗谱(EIS)和表面形貌观察方法,并结合量子化学计算,在3.5%NaCl饱和Ca(OH)2溶液中研究探讨了山梨醇与二乙烯三胺缩聚物(SDC)对碳钢腐蚀的抑制行为.结果表明:SDC的加入可有效降低碳钢的腐蚀电流密度,提高碳钢的点蚀电位,表明阻绣剂对Cl-诱导的局部腐蚀具有良好的抑制作用,为混合型阻锈剂;且在所研究浓度范围内,随添加浓度增加,缓蚀效率提高.化合物对碳钢腐蚀的抑制主要源自阻锈剂分子在碳钢表面的静电吸附,且吸附遵循Langmuir等温吸附规律.The inhibitive action of a sorbitol/diethylenetriamine condensation （SDC） product toward carbon steel corrosion in saturated Ca（OH）2 solution containing 3.5% NaCl was investigated using potentiodynamic polarization,electrochemical impedance spectroscopy （EIS）,surface morphological observations,and quantum chemical calculations.The results indicate that the addition of SDC can effectively decrease the corrosion current densities of the carbon steel and increase the pitting corrosion potential suggesting that the local corrosion induced by Cl- is strongly restricted by the inhibitor,which acts as a mixed type inhibitor.In the studied concentration range,the inhibition efficiency increased with an increase in inhibitor concentration.The overall inhibition behavior of SDC is attributed to the stabile adsorption film formd by the dominantly physical adsorption on the carbon steel surface according to the Langmuir adsorption isotherm.

关 键 词：阻锈剂 钢筋防护 缓蚀效应 吸附行为 

分 类 号：O646.6[理学—物理化学] TG171[理学—化学]